CCNA2 V4.0 Exploration - FINAL EXAM

CCNA 2 - final exam (correct answers  - 100%)

1. Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three)

>>> The router modifies the TTL field, decrementing it by one
>>> The router maintains the same source and destination IP
>>> The router changes the source physical address to the physical address of the exit interface






2. Which of the following are primary functions of a router? (Choose two)

>>> Packet switching
>>> Path selection






3. Refer to the exhibit. Which statement is true concerning the routing configuration?

>>> Packets routed to the R2 ethernet interface require two routing table lookups






4. Refer to the exhibit. The results of the show ip route command are displayed in the graphic for Router R2 Which route will be selected for a packet with a destination address of 10141?

>>> 0000/0 via 19216801






5. Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two)

>>> 10000/8
>>> 19216820/24






6. Refer to the exhibit. Pings are failing between HostA and HostB. The network administrator discovers that Router1 does not have a route to the 1721600 network Assuming Router2 is configured correctly, which two static routes could be configured on Router1 to enable Host A to reach network 1721600? (Choose two)

>>> ip route 1721600 25525500 S0/0
>>> ip route 1721600 25525500 19216802






7. What can be determined from the output shown in the exhibit? (Choose two)

>>> Montgomery has Layer 2 connectivity with Cumberland
>>> Brant, Fisherman, and Potomac are directly connected to Montgomery






8. Refer to the exhibit. Which path will traffic from the 1721610/24 network take to get to the 10000/24 network?

>>> It will load balance the traffic between ADC and ABC




9. Which two statements are true regarding link-state routing protocols? (Choose two)

>>> They are aware of the complete network topology
>>> They offer rapid convergence times in large networks




10. Refer to the routing table shown in the exhibit. What is the meaning of the highlighted value 192?

>>> It is the metric, which is cost




11. A router has learned about a network through static and dynamic routing processes. Which route will be used to reach network 1921681680?

>>> S 1921681680/24 [1/0] via 1921682001




12. When presented with multiple valid routes to a destination, what criteria does a router use to determine which routes to add to the routing table?

>>> The router first selects routes with the lowest administrative distance. The resulting routes are then prioritized by metric and the routes with the best metric are added to the routing table




13. What does RIP use to reduce convergence time in a larger network?

>>> It uses triggered updates to announce network changes if they happen in between the periodic updates






14. Which three statements are true of holddown timers? (Choose three)

>>> Prevent update messages from reinstating a route that may have gone bad
>>> A low routers to still forward packets to destination networks that are in holddown
>>> Permit lower metric updates received from any neighboring router to reinstate the route to a possibly down network




15. Refer to the exhibit. The network is using the RIPv2 routing protocol If network 10000 goes down, what mechanism will prevent Router1 from advertising false routing information back to Router2?

>>> Split horizon




16. Refer to the exhibit. The network is running the RIP routing protocol Network 10000 goes down Which statement is true regarding how the routers in this topology will respond to this event?

>>> Router5 will send Router4 a triggered update with a metric of 16 for network 10000




17. What is the purpose of the TTL field within an IP packet header?

>>> Limits the period of time or number of hops a packet can traverse through the network before it should be discarded




18. A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?

>>> B(config)# router rip
>>> B(config>>>router)# passive>>>interface S0/0




19. Which statement is true regarding routing metrics?

>>> Routers compare metrics to determine the best route




20. Refer to the exhibit. When troubleshooting a network, it is important to interpret the output of various router commands On the basis of the exhibit, which three statements are true? (Choose three)

>>> The missing information for Blank 1 is the command show ip route
>>> The missing information for Blank 2 is the number 120
>>> The missing information for Blank 3 is the letter C






21. Refer to the exhibit. What is the most efficient summarization of the routes a ached to router R1?

>>> 19818480/21






22. The network shown in the diagram is having problems routing traffic It is suspected that the problem is with the addressing scheme What is the problem with the addressing used in the topology?

>>> The subnetwork configured on the serial link between Router1 and Router2 overlaps with the subnetwork assigned to Ethernet0 of Router3






23. Refer to the exhibit. How many routes are both level 1 and qualify for use as an ultimate route?

>>> 2




24. The Suffolk router is directly connected to the networks shown in the graphic and has a default route that points to the Richmond router. All interfaces are active and properly addressed However, when the workstation on network 1722950/24 sends a packet to destination address 172.29.19.85 it is discarded by the Suffolk router. What can be a reason for this result?

>>> The ip classless command is not enabled on the Suffolk router






25. Which three statements describe the operation of routing with EIGRP? (Choose three)

>>> As new neighbors are discovered, entries are placed in a neighbor table
>>> If hello packets are not received within the hold time, DUAL must recalculate the topology
>>> The reported distance is the distance to a destination as advertised by a neighbor




26. Refer to exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three)

>>> Paris(config)# router eigrp 100
>>> Paris(config>>>router)# network 19216870
>>> Paris(config>>>router)# network 19216880






27. Refer to the exhibit. What two statements are true based on the output shown? (Choose two)

>>> Neighbors 192168109 and 192168105 have auto summary disabled

>>> Router 3 is load balancing traffic to the 1721630 network across its serial Interfaces






28. Refer to the exhibit. A new PC was deployed in the Sales network. It was given the host address of 1921681031 with a default gateway of 1921681017 The PC is not communicating with the network properly. What is the cause?

>>> 1921681031 is the broadcast address for this subnet






29. Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three)

>>> The AD of EIGRP routes has been manual y changed to a value other than the default value
>>> Router1 is running both the EIGRP and OSPF routing process
>>> No default route has been configured






30. Which of the following could describe the devices labeled "?" in the graphic? (Choose three)

>>> DCE
>>> CSU/DSU
>>> Modem






31. Using default settings, what is the next step in the router boot sequence after the IOS loads from flash?

>>> Locate and load the startup-config file from NVRAM






32. Refer to the exhibit. What are the effects of the exhibited commands on the router?

>>> Only the enable password is encrypted






33. When the show cdp neighbors command is issued from Router C, which devices will be displayed in the output?

>>> B, D




34. Refer to exhibit. A company network engineer enters the following commands in the routers:

>>> R1(config)# ip route 10110 2552552550 19216802
>>> R2(config)# ip route 10120 2552552550 19216801




35. When the engineer enters the show ip route command on R1, the routing table does not display the static route to the 10110 network Al R1 and R2 interfaces are correctly addressed per the graphic. What is a logical next step that the engineer could take in order to make the static route display in the routing table in R1?

>>> Enable the R1 and R2 serial interfaces






36. Which two router component and operation pairs are correctly described? (Choose two)

>>> NVRAM - stores the configuration file
>>> POST - runs diagnostics on hardware modules






37. What are three features of CDP? (Choose three)

>>> Tests Layer 2 connectivity
>>> Enabled by default on each interface
>>> Provides information on directly connected devices that have CDP enabled






38. Refer to the exhibit. R1 knows two routes, Path A and Path B, to the Ethernet network a ached to R3 R1 learned Path A to network 10200/16 from a static route and Path B to network 10200/16 from EIGRP Which route will R1 install in its routing table?

>>> The route via Path A is installed because the static route has the lowest administrative distance to network 10200/16






39. What command would the network administrator apply to a router that is running OSPF to advertise the entire range of addresses included in 1721600/19 in area 0?

>>> R1(config>>>router)# network 1721600 0031255 area 0






40. Refer to the exhibit. What will happen if interface Serial0/0/1 goes down on Router1?

>>> DUAL will query neighbors for a route to network 19216810






41. What is the function of the OSPF LSU packet?

>>> Used to announce new OSPF information and to reply to certain types of requests






42. Refer to the exhibit Hosts on the BOS Fa0/0 LAN are able to ping the Fa0/1 interface on the JAX router and all interfaces on the BOS and ORL routers. Why would hosts from the 10000/24 network not be able to ping hosts on the Fa0/0 LAN of the JAX router?

>>> The JAX router needs the network 19216830 000255 area 0 command






43. What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two)

>>> The routers must agree on the network type
>>> The routers must use the same dead interval






44. Which three statements about routing protocols are true? (Choose three)

>>> OSPF elects designated routers on multiaccess links
>>> EIGRP supports unequal cost load balancing
>>> RIP does not advertise a route beyond a hop count of 15






45. A network administrator has configured a default route on Router_A but it is not being shared with adjacent Router_B and the other routers in the OSPF area. Which command wil save the administrator the time and trouble of configuring this default route on Router_B and all of the other routers in the OSPF area?

>>> Router_A(config>>>router)# default>>>informa on originate






46. Which of the following are required when adding a network to the OSPF routing process configuration? (Choose three)

>>> Network address
>>> Wildcard mask
>>> Area ID






47. Which of the following should be considered when troubleshooting a problem with the establishment of neighbor relationships between OSPF routers? (Choose three)

>>> OSPF interval timers mismatch
>>> Interface network type mismatch
>>> Inconsistent authentication configuration






48. Refer to the exhibit. The routers in the exhibit are running the EIGRP routing protocol What statement is true regarding how packets will travel from the 1721610/16 network to the 1921682000/24 network?

>>> The router installs all the equal cost paths in the routing table and performs equal cost load balancing to send packets out multiple exit interfaces






49. What is the first step OSPF and IS>>>IS routers take in building a shortest path first database?

>>> Learn about directly connected networks






50. Refer to the exhibit. Routers 1 and 2 are directly connected over a serial link Pings are failing between the two routers. What change by the administrator will correct the problem?

>>> Change the IP address on Serial 0/1/0 on router 2 to 19216801/30






51. Refer to the exhibit. The network administrator issues the command no ip classless on Router1 What forwarding action will take place on a packet that is received by Router1 and is destined for host 192168026?

>>> The packet will be dropped






52. The network administrator configures the router with the ip route 1721610 2552552550 1721622 command How will this route appear in the routing table?

>>> S 1721610 [1/0] via 1721622






53. Refer to the exhibit. The network administrator is testing network connectivity by issuing the tracert command from host A to host B Given the exhibited output on host A, what are two possible routing table issues on the network? (Choose two)

>>> Router2 is missing a route to the 1721600 network
>>> Router3 is missing a route to the 10000 network






54. Refer to the exhibit. All routers in the network are running RIPv2 and EIGRP with default routing protocol settings and have interfaces configured with the bandwidths that are shown in the exhibit. Which protocol will be used and how will traffic between the Router1 LAN and Router5 LAN be routed through the network?

>>> EIGRP traffic will use the path Router1, Router3, Router4, Router5 because it has the best metric






55. Refer to the exhibit. All router interfaces are configured with an IP address and are operational If no routing protocols or static routes are configured, what information will be included in the show ip route command output for router A?

>>> Routes to networks 19216810/24, 19216820/24, and 19216830/24 will be in the routing table






56. Refer to the exhibit. What summary address can Router2 advertise to Router1 to reach the three networks on Routers 3, 4, and 5 without advertising any public address space or overlapping the networks on Router1?

>>> 1721600/13

CCNA2 V4.0 Exploration - Chapter 11

Chapter 11 - Exam Answers

1. Refer to the exhibit. What does the "O*E2" from the "O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0" line represent?
- an external OSPF route that will not increment in cost.

2. Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?
- 1786

3. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose three.)

- area id
- hello interval
- network type

4. What does OSPF use to reduce the number of exchanges of routing information in networks where large numbers of neighbors are present? (Choose two.)

- designated router
- backup designated router

5. What does OSPF use to calculate the cost to a destination network?

- bandwidth

6. A fully converged five router OSPF network has been running successfully for several weeks. All configurations have been saved and no static routes are used. If one router looses power and reboots, what information will be in its routing table after the configuration file is loaded but before OSPF has converged?

- Routes for connected networks that are operational will be in the routing table.

7. Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set of statements was entered for router B to generate the exhibited routing table?

- B(config-router)# network 192.168.1.0 0.0.0.3 area 0

8. Refer to the exhibit. Which network command or set of sommands will cause OSPF to be enabled to send and receive packets for any R1 interface in the exhibited subnets?

- R1(config-router)# network 0.0.0.0 255.255.255.255 area 0

9. Refer to the exhibit. What does the "2" stand for in the router ospf 2 statement?

- The number 2 identifies this particular instance of OSPF on this router.

10. Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about this network?

- The highest router ID was most likely determined via an OSPF router-id statement or statements.

11. Refer to the exhibit. What configuration statements would give the results that are shown in the output of the show ip protocols command?

- B(config)# router ospf 1B(config-router)# router-id 192.168.1.5

12. Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete topology if a DR or BDR were not elected in this OSPF network?

- 6

13. What is the default administrative distance for OSPF?

- 110

14. Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and OSPF interface priorities. Loopback interfaces are not configured and all interfaces are operational. Router D is the DR and router C is the BDR. What happens immediately after the following commands are entered on router A?

- A(config)# interface fa0/0
A(config-if)# ip ospf priority 255
D will remain the DR. C will remain the BDR.

15. Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing table for the 10.0.0.0/24 network?

- 1787

16. What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?

- 192.168.0.0/24 through 192.168.15.0/24

17. Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.168.100.1. What steps must the administrator take to accomplish this?

- nothing, the router-id of Router1 is already 192.168.100.1

18. Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relationship is developed between Router1 and Router2?

- A FULL adjacency is formed.

19. Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no configured loopback interfaces, what two roles will router B play on each network segment? (Choose two.)

- DR for network 192.168.1.200
- BDR for network 192.168.1.204

20. Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor command reveals no neighbors. What is a possible cause?

- OSPF hello or dead timers do not match

21. Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of last resort to the other routers in OSPF area 0?

- RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6
RouterB(config)# router ospf 10
RouterB(config-router)# default-information originate

 22. Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on their Ethernet interfaces. Router D was just added to the network. Routers are configured with the loopback interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after RouterD is added to the network?

- There is no change in the DR or BDR until either current DR or BDR goes down.

23. Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)

- Elections are required in broadcast multiaccess networks.
- Elections are required in non-broadcast multiaccess networks.

24. Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings to advertise all attached networks. If all of the routers start at the same time, what will be the result of the DR and BDR elections for this single area OSPF network? (Choose three.)

- Router A will be DR for 10.4.0.0/16.
- HQ will be BDR for 10.4.0.0/16.
- Remote will be DR for 10.5.0.0/16.

25. Refer to the exhibit. What must be received between neighbors to prevent the dead time that is shown in the exhibit from reaching zero?

- hello packets

CCNA2 V4.0 Exploration - Chapter 10

Chapter 10 - Exam Answers

1.What action does a link-state router take immediately upon receipt of an LSP from a neighboring router?

• floods the LSP to neighbors
calculates the SPF algorithm
runs the Bellman-Ford algorithm
computes the best path to the destination network

2.Why is it difficult for routing loops to occur in networks that use link-state routing?

Each router builds a simple view of the network based on hop count.
Routers flood the network with LSAs to discover routing loops.
• Each router builds a complete and synchronized view of the network.
Routers use hold-down timers to prevent routing loops.


3.Refer to the exhibit. What kind of information would be seen in an LSP sent from router JAX to router ATL?

hop count
uptime of the route
• cost of the link
a list of all the routing protocols in use

4.To achieve network convergence, what three steps does each link state router take? (Choose three.)

use automatic summarization to reduce the size of routing tables
• build a Link State Packet (LSP) containing the state of each directly connected link
• flood the LSP to all neighbors, who then store all LSPs received in a database
discover neighbors and establish adjacencies using the hello packet sent at regular intervals
• construct a complete map of the topology and compute the best path to each destination network
use the DUAL FSM to select efficient, loop-free paths, and insert routes into the routing table

CCNA2 V4.0 Exploration - Chapter 9

Chapter 9 - Exam Answers

1.What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Choose two.)
put the route into passive mode
*query neighbors for a new route
search routing table for a feasible successor
run the SPF algorithm to find a new successor
*search topology table for a feasible successor


2.Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must EIGRP be configured to
enable connectivity between the two hosts? (Choose two.)
R1(config-router)# network 192.168.1.128
R1(config-router)# auto-summary
* R1(config-router)# no auto-summary
* R2(config-router)# no auto-summary
R2(config-router)# auto-summary
R2(config-router)# network 192.168.1.64


3.Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10. Pings between
hosts on networks that are connected to router A and those that are connected to router B are successful.
However, users on the 192.168.3.0 network are unable to reach users on the 192.168.1.32 network. What is the
most likely cause of this problem?
IP classless is enabled and is causing the packet to drop.
*The command network 192.168.1.32 was not issued on router C.
The routers are not configured in the same EIGRP routing domain.
Automatic summarization of the networks is causing the subnetted routes to be dropped.


4.What information is maintained in the EIGRP topology database for a destination route? (Choose three.)
*the routing protocol
*the feasible distance of the route
the highest cost of the route
the SRTT value for the route
*the route cost as advertised by the neighboring router
the physical address of the gateway interface


5.On a router running EIGRP, what database would maintain a list of feasible successors?
routing table
neighbor table
*topology table
adjacency table


6.Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?
*the route is in a stable state
the route is a preferred route
DUAL is searching for a better route to this destination
the exit interface is in passive mode and EIGRP advertisements are blocked


7.In the command router eigrp 20, what is the purpose of the number 20?
specifies the administrative distance for all EIGRP routes
*identifies the autonomous system number this EIGRP process will advertise
determines what metric is added to all advertised routes
indicates the number of addresses in the EIGRP routing domain


8.Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 represent?
the route metric that is applied to those EIGRP routes for this router
the trustworthiness of the routing information source
the composite of the hop count and bandwidth to that destination network
*the total metric for that network as advertised by the EIGRP neighbor

9.Which two statements describe characteristics of EIGRP? (Choose two.)
*EIGRP is a distance vector routing protocol.
*EIGRP supports classless routing and VLSM.
EIGRP is classified as a link-state routing protocol.
EIGRP uses TCP for reliable delivery of EIGRP update packets.
With EIGRP, loop-free paths are achieved through the use of hold-down timers.
EIGRP sends a periodic update every 30 minutes.


10.Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send
to Router1 and Router3?
a query for network 192.168.0.0/28
an acknowledgment packet to 224.0.0.9
an update packet that is sent to 255.255.255.255
a packet that contains the new routing table for R2
*unicast update packets to 192.168.1.1 and 192.168.2.1


11.Refer to the exhibit. Which command will advertise the 192.168.1.64/30 network but not the 192.168.1.32
network on router A?
network 192.168.1.0
network 192.168.1.0 255.255.255.0
network 192.168.1.64 0.0.0.3
*network 192.168.1.64 0.0.0.7
network 192.168.1.64 0.0.0.255


12.What administrative distance would a router assign to a default route in EIGRP that is learned from a source
external to the autonomous system?
1
5
70
90
*170
190

13.In which of the following tables does the EIGRP DUAL algorithm store the primary route to a destination?
(Choose two.)
*routing
*topology
neighbor
path
shortest path

14.Which of the following types of routes will be denoted by EX in EIGRP routing table entries? (Choose two.)
*routes learned from other routing protocols
routes learned from any non-adjacent EIGRP routers
any route with a hop count metric higher than 224
*EIGRP routes that originate in different autonomous systems
all passive routes in the routing table

15.Which term defines a collection of networks under the administrative control of a single entity that presents a
common routing policy to the Internet?
*autonomous system
contiguous networks
process ID
BGP


16.Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static routes are c
on this router. What can be concluded about network 198.18.1.0/24 from the exhibited output?
A route to network 198.18.1.0/24 is not listed in the routing table.
*Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.
EIGRP will perform equal cost load balancing across two paths when forwarding packets to 198.18

17.The router with interface 172.16.3.2 is a successor for network 198.18.1.0/24.
Refer to the exhibit. All interfaces have been configured with the bandwidths that are shown in the example
Assuming that all routers are using a default configuration of EIGRP as their routing protocol, what
packets take from the 172.16.1.0/16 network to the 192.168.200.0/24 network?
*A,B,E
A,C,E
A,D,E
Packets will load balance across the A,B,E and A,C,E paths.
Packets will load balance across the A,B,E and A,D,E paths.
Packets will load balance across the A,C,E and A,D,E paths.

18.Which of the following statements describes the bounded updates used by EIGRP?
Bounded updates are sent to all routers within an autonomous system.
*Partial updates are sent only to routers that need the information.
The updates are sent to all routers in the routing table.
Updates are bounded by the routers in the topology table.

19.By default, which two metrics are used by EIGRP to determine the best path between networks?
MTU
load
*delay
*bandwidth
reliability




20.The show ip eigrp topology command output on a router displays a successor route and a feasible successor
route to network 192.168.1.0/24. In order to reduce processor utilization, what does EIGRP do when the
primary route to this network fails?
The router sends query packets to all EIGRP neighbors for a better route to network 192.168.1.0/24.
The DUAL FSM immediately recomputes the algorithm to calculate the next backup route.
Packets that are destined for network 192.168.1.0/24 are sent out the default gateway instead.
*The backup route to network 192.168.1.0/24 is installed in the routing table.

21.Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible problems with
adjacencies between Router1 and Router2? (Choose two.)
*The routers are configured with different EIGRP process IDs.
Automatic summarization was disabled.
The hello timer for R1 was altered.
*The serial interfaces for both routers are in different networks.
No feasible successors were found.

22.Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They are not
forming an adjacency. What is the cause?
one router is a non-cisco router
* they have different autonomous-system numbers
they are using difference sequence numbers
they are sending incorrect hello types

CCNA2 V4.0 Exploration - Chapter 8

Chapter 8 - Exam Answers

1.Refer to the exhibit. Router B receives a packet with a destination address of 10.16.1.97. What will router B do?

drop the packet
forward the packet via the route to 10.16.1.0
forward the packet via the route to 10.16.1.64
*use the default route


2. A network is converged and the routing tables are complete. When a packet needs to be forwarded, what is the first criterion used to determine the best path in the routing table?

the route with the smallest AD
*the route with the longest address and mask match to the destination
the route with the highest bandwidth
the route with the best combination of AD and lowest cost


3.Refer to the exhibit. Which statement correctly describes this network?

EIGRP is being used
*There is at least one parent and one child route
192.168.2.0, 192.168.3.0, and 192.168.4.0 networks are child routes
Traffic going to 172.16.3.0 will be directed to s 0/0/1


4.Refer to the exhibit. Router1 has been issued the ip classless command. What happens to packets destined to host 172.16.3.10?

they are dropped
sent to default gateway
*forward out interface Serial0/0/1
forward out interface FastEthernet 0/0

5.The following entry is displayed in the routing table:

R 192.168.8.0/24 [120/2] via 192.168.4.1, 00:00:26, Serial0/0/1

What type of route is this?
a level 1 parent route
a level 1 supernet route
*a level 1 ultimate network route
a level 2 child route
a level 2 ultimate child route

6.What determines if the router implements a classless route lookup process?

Child routes are present in the routing table.
A classless routing protocol has been configured on the router.
*The command ip classless is enabled on the router.
Multiple routes with different masks to the same destination are in the routing table.
Routing table entries have a next-hop IP address and an exit interface for each child route.


7.Refer to the exhibit. How many routes in this output qualify for use as ultimate routes?

3
4
5
6
*7


8.Refer to the exhibit. What protocol was used to distribute the routing information for the network 172.16.1.4?

RIPv1
*RIPv2
EIGRP
OSPF


9.Refer to the exhibit. What can be determined from this output?

The router will have to perform recursive lookups to forward a packet destined for 192.168.2.213/24.
The parent route for these networks was removed from the routing table.
A route to 192.168.0.0/25 would be classified as a supernet route for the routes listed in the routing table.
*All of the routes listed are network routes.


10.Refer to the exhibit. The graphic contains partial contents of the routing table on router E. Router E is running version 12.3 of the IOS and is configured for default routing behavior. Router E receives a packet to forward. Which route in the routing table will be searched first and why?

172.16.1.0/25 because it is the first ultimate route
0.0.0.0/0 because it is the lowest network number
*172.16.0.0/25 because it is the first level 1 route
172.18.0.0/15 because it has the shortest mask


11.Refer to the exhibit. Router1 is running IOS version 12.2. What will the network administrator need to do so that packets for unknown child routes of 172.16.0.0/24 will not be dropped?

issue the ip default-network command
use a classful routing protocol such as RIPv1
enable either OSPF or ISIS as the routing protocol
issue the ip classless command
*do nothing, ip classless is on by default


12.Refer to the exhibit. With the ip classless command issued, what will router R2 do with a packet destined for host 172.16.4.234?

drop the packet
*send packet out Serial 0/0/1
send packet to network 0.0.0.0
send packet out FastEthernet 0/0

13.A router has the following entries in its routing table:

S 192.168.0.0/24 [1/0] via 192.168.128.2
O 192.168.0.0/25 [110/2175] via 172.16.1.1, 00:02:15, FastEthernet0/1
D 192.168.0.0/25 [90/22455] via 172.16.2.2, 00:12:15, Serial0/0/0
R 192.168.0.0/26 [120/2] via 172.16.3.3, 00:00:15, Serial0/0/1

The router receives a packet that is destined for a host with the address 192.168.0.58. Which route would this router use to forward the packet?

the static route
the OSPF route
the EIGRP route
*the RIP route


14.Refer to the exhibit. What parent network will automatically be included in the routing table when the three
subnets are configured on Router1?

*172.16.0.0/16
172.16.0.0/24
172.16.0.0/30
172.16.1.0/16
172.16.1.0/24


15.Refer to the exhibit. What subnet mask will Router1 apply to child routes of the 172.16.0.0/24 network?
0.0.0.0
255.255.0.0
*255.255.255.0
255.255.255.255


16.Refer to the exhibit. The network administrator has discovered that packets destined for servers on the 172.16.254.0 network are being dropped by Router2. What command should the administrator issue to ensure that these packets are sent out the gateway of last resort, Serial 0/0/1?

*ip classless
no ip classless
ip default-network 0.0.0.0
ip default-gateway 172.16.254.1
ip route 0.0.0.0 0.0.0.0 Serial 0/0/1


17.Refer to the exhibit. A packet destined for host 128.107.0.5/16 is processed by the JAX router. After finding the static route in the routing table that matches the destination network for this packet, what does the router do next?

searches for a default route to forward the packet
drops the packet since the static route does not have an exit interface
*performs a recursive lookup to find the exit interface used to forward the packet
sends a request to neighboring routers for the location of the 128.107.0.0 network

18.What occurs when no ip classless is implemented on the router?

The router will only support classful IP addressing.
The router will only support classful routing protocols.
The router will use a default route, if present, when a matching route is not found in the routing table.
*The router will assume it has knowledge of all subnets in the network and will not search beyond child routes for a better match.

19.A route to a destination network is learned from multiple routing protocols. What is used by a Cisco router to select the preferred route to the destination that will be installed in the routing table?

metric
route prefix
update timer
*administrative distance

CCNA2 V4.0 Exploration - Chapter 7

Chapter 7 - Exam Answers






1.A network administrator has been told that the company IP address infrastructure must adhere to RFC 1918. What three IP address ranges from RFC 1918 could the administrator use on the network? (Choose three.)

• 10.0.0.0/8
127.0.0.0/8
169.254.0.0/16
• 172.16.0.0/12
• 192.168.0.0/16
209.165.201.0/27



2.Refer to the exhibit. Routers East and West are configured using RIPv1. Both routers are sending updates about their directly connected routes. The East router can ping the West router serial interface and West can ping the serial interface of East. However, neither router has dynamically learned routes from the other. What is most likely the problem?

A gateway of last resort is required.
Subnetting is not supported by RIPv1.
• VLSM is not supported by RIPv1.
One of the routers needs a clock rate on the serial interface.



3.Refer to the exhibit. What effect will the commands that are shown have on RIP updates for Router1?

Only version 2 updates are sent to 255.255.255.255.
• Only version 2 updates are sent to 224.0.0.9.
Both version 1 and version 2 updates are sent to 224.0.0.9.
Both version 1 and version 2 updates are sent to 255.255.255.255.


4.Refer to the exhibit. What can be concluded from the output shown in the exhibit?

The routing table is limited to 2 routes.
The LAN interfaces are participating in the routing process.
One update has been sent out of each serial interface and 2 have been received.
• The no auto-summary has not been configured on this router.

5
What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)

• RIP version 2 supports VLSM.
RIP version 2 supports more than 16 routers.
RIP version 2 supports classful (and not classless) routing
• RIP version 2 supports routing update authentication.
RIP version 2 supports multi-areas.
RIP version 2 uses the Dijkstra algorithm rather than the Bellman-Ford algorithm.


6.Refer to the exhibit. RIPv1 is configured as the routing protocol for the network that is shown. The following commands are used on each router:

router rip
network 10.0.0.0
network 172.16.0.0

When this configuration is complete, users on the LAN of each router are unable to access the remote LANs. Why?

The network statements are configured incorrectly.
A routing loop has been created.
• RIPv1 is unable to route to discontiguous subnets of a major network.
RIPv1 is unable to route networks with a /24 subnet mask.


7.A network administrator installed four new routers that are running RIPv2. Router1 is a boundary router in the RIPv2 network and has a default route configured. Once the network has converged, the network administrator enters Router1(config-router)# default-information originate on Router1. How will this affect the network?

prevents Router1 from forwarding updates about networks that are not directly connected
causes all routers in the network to synchronize routing updates with Router1
forces Router1 to become the primary or designated router (DR) for updates
• propagates the default route to all routers in the network



8.Refer to the exhibit. A technician needs to add a new loopback interface to test routing functionality and network
design. The technician enters the following set of commands on the router:

Sanford(config)# interface loopback1
Sanford(config-if)# ip address 192.168.6.62 255.255.255.252

Why does the router respond with an error?

The router does not allow loopback interface configurations.
This mask can not be used with this class of addresses.
Classless routing must be configured before this address can be added.
• The network address for Loopback1 overlaps with an already configured interface address.
The router is over the limit for the maximum paths that can be provided in the routing table.

9.What is the maximum network diameter permitted by the default metric of RIPv2?

• 15 hops
16 hops
100 hops
120 hops
255 hops


10.What are two functions of the network command used when configuring routing protocols? (Choose two.)

• identifies which networks will be included in the routing updates
identifies the hosts addresses that can be summarized in the network
used to list all addresses for remote and local networks
determines which subnet mask to apply to routing updates
• determines which interfaces can send and receive routing updates


11.Refer to the exhibit. All routers are running RIPv1. What changes will occur in the routing table of router B if a loopback interface with an address of 10.16.1.129/27 is configured on router B?

Routes to the 10.16.1.0/27, 10.16.1.64/27, and 10.16.1.128/27 networks are added.
• A connected route to the 10.16.1.128/27 network is added.
A third route to the 10.0.0.0/8 network with RIPv1 as the source is added.
The 10.0.0.0/8 route is dropped immediately from the routing table after router B is configured.


12.Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network?

Rip version 2 does not send subnet masks in its updates.
Router A is not setup with RIP as a routing protocol.
• Rip version 2 will auto summarize routes by default.
Router B is not setup to advertise the 192.168.1.64/30 network.


13.RIPv2 is the configured routing protocol on the routers in a network. The command Router(config-router)# no version 2 is entered on the routers. What effect does entering this command have on routing updates?

Subnet masks will be added to the routing updates.
Routing updates will be sent out using multicast address 224.0.0.9.
• Version 1 and 2 updates will be received and the version 2 updates will not be sent.
The RIP routing process will be removed from the router and routing updates will not be forwarded.


14.How are RIP v1 and RIP v2 similar to one another? (Choose three.)

• They both use hop count as a metric.
• They both have the same metric value for infinite distance.
They both broadcast their updates to their neighbors.
They both send subnet mask information in their updates.
They both provide for authentication of update sources.
• They both use split horizon to prevent routing loops.


15.Refer to the exhibit. The exhibited network contains a mixture of Cisco and non-Cisco routers. The command debug ip rip was entered on the JAX router. All routers are running the same version of RIP. Router CHI and Router ORL are not able to reach the 192.168.1.16/28 network. What is a possible solution to this problem?

Enable split horizon in the network.
• Configure RIPv2 on routers.
Add network 192.168.1.0 to the RIP configuration on the JAX router.
Configure JAX Fa0/0 as a passive interface.
Enable the Serial0/0/0 interface on the JAX router.
Change the IP address on the Fa0/0 interface of the JAX router to 192.168.1.1/24.


16 .What field was added to the RIP message header by RFC 1723 to add support for VLSM and CIDR?

• subnet mask
destination port number
address family identifier
source and destination IP addresses


17.Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network?

Router1(config)# ip classless
Router1(config-router)# no passive-interface serial 0/1/1
• Router2(config-router)# version 2
Router2(config-router)# neighbor 10.0.0.2


18.Refer to the exhibit. Which two statements are true? (Choose two.)

• Router1 will install a route to 192.168.0.0/20
Router1 will install a route to 192.168.0.0/24
Router1 will install a route to 192.168.16.0/24
Router2 will install a route to 192.168.16.0/24
• Router2 will not install a route to 192.168.16.0/20



19.Refer to the exhibit. All routers are running RIP version 2. JAX is configured to just advertise the 10.0.0.0/24 network. CHI is configured to advertise the 172.16.0.0/16 network. A network administrator enters the commands shown in the exhibit. What changes will occur in this network?

The JAX router will ignore updates for the 172.16.0.0/16 network due to split horizon issues.
• The CHI router will install a route to the 192.168.0.0/16 network in its routing table.
The routing table for CHI will have the 192.168.0.0/16 route but it will have an S next to the route.
The ORL router will apply a 255.255.0.0 subnet mask to all networks in the routing updates it forwards.



20.Refer to the exhibit. Which command will allow Router2 to learn about the 192.168.16.0/28 network?

Router1(config)# ip classless
• Router1(config-router)# network 192.168.16.0
Router1(config-router)# no passive-interface serial 0/1/1
Router2(config-router)# version 2
Router2(config-router)# neighbor 10.0.0.2

CCNA2 V4.0 Exploration - Chapter 6

Chapter 6 - Exam Answers

1. What two advantages does CIDR provide to a network? (Choose two.)

--> reduced routing table size

--> reduced routing update traffic

2. Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?

--> 192.168.4.15/29

3. In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?

--> 84

4. Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)

--> 32-bit address

--> Subnet mask

5. Refer to the exhibit. The network administrator wants to create a subnet for the point-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?

--> 255.255.255.252

6. What does VLSM allow a network administrator to do?

--> utilize multiple subnet masks in the same IP address space

7. Which three interior routing protocols support VLSM? (Choose three.)

--> OSPF

--> RIP v2

--> EIGRP

8. Which of the following problems does VLSM help to alleviate?

--> the shortage of IP addresses

9. Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:

1. pings from R1 to the S0/0/0 interface on R2....successful

2. pings from R1 to the Fa0/0 interface on R2....successful

3. pings from host B to hosts on the 10.1.1.0/24 network....successful

4. pings from host B to the Fa0/0 interface on R2....successful

5. pings from R2 to host B....successful.

What is the likely cause of the failure of the ping from R1 to host B?

--> The default gateway on host B is not correctly set.

10. A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)

--> 255.255.255.224 for Sales

--> 255.255.255.240 for QA

11. Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?

--> 192.168.0.0/21

12. A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?

--> /27

13. Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address in each subnet. Which IP address would be usable for a host on one of the LANs in this network?

--> 192.168.2.130/25

14. Refer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?

--> 24

15. Refer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?

--> 29

16. An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?

--> 192.1.1.224/28

17. What is a supernet?

--> a summarization of classful addresses

18. Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet is given 10.0.1.192/26. What will be the result of this addressing scheme?

--> The subnets overlap and will be rejected by the router.

19. A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?

--> 192.168.32.0 – 192.168.47.0/24

20. Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?

--> CIDR

---------------------------------------------------------------------

CCNA2 v4.0 Exploration - Chapter 5

Chapter 5 - Exam Answers

1. Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently added and will only contain end users. What command or set of commands should be entered on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this new network to be advertised to other routers?

--> Router1(config-router)# no network 192.168.10.0


2. The following line was displayed in the output of the show ip route command.
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0
What is the value of the routing metric?

--> 3


3. Which of the following is considered a limitation of RIP v1?

--> RIP v1 does not send subnet mask information in its updates.


4. Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route is still in the Router1 routing table. How much longer will Router1 keep the down network in its routing table before marking it as possibly down?

--> 155 seconds


5. Refer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to configure the gateway of last resort?

--> ip route 0.0.0.0 0.0.0.0 S0/0/1


6. What are three characteristics of the RIPv1 routing protocol? (Choose three.)

--> uses hop count as a metric
--> considers a metric of 16 as infinity
--> calculates metrics using the Bellman Ford algorithm


7. Which of the following would be the correct command sequence to enable RIP on Router B for all connected networks?


RouterB(config)# router rip
RouterB(config-router)# network 198.16.4.0
RouterB(config-router)# network 210.36.7.0
RouterB(config-router)# network 220.17.29.0


8. What is the default update period in seconds for the RIP routing protocol?

--> 30




9. Refer to the exhibit. What can be concluded from the routing table output of router B?

--> The default-information originate command has been entered on A.



10. Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols command is issued on one of the routers in the network?

--> routing protocol configuration in use for IP on this router



11. Refer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are running RIPv1. The network is converged. Which routes are present in the routing tables?

--> All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.



12. Which two statements are true regarding the characteristics of RIPv1? (Choose two).

--> It is a distance vector routing protocol.

--> The data portion of a RIP message is encapsulated into a UDP segment.



13. Which command or set of commands will stop the RIP routing process?

--> RouterB(config)# no router rip



14. Refer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator issues the show ip route command on router A. What routes would appear in the routing table output if the network is converged? (Choose two).

--> R 192.168.2.0/24 [120/1]

--> R 10.10.1.0/24 [120/2]



15. Which command will display RIP activity as it occurs on a router?

--> debug ip rip



16. Refer to the output from the show ip route command. What can be concluded from the output of this router command?

--> There are two equal cost paths to network 1.0.0.0.



17. Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures the command network 10.1.0.0 on Router1. What network will Router1 advertise to Router2?

--> 10.0.0.0/8



18. Refer to the exhibit. Pings between the serial interfaces of the routers are successful. Hosts on each LAN can ping the Fa0/0 interface of the router to which they are directly connected through the switch. However, pings between hosts on the 10.1.1.0/24 and 10.1.2.0/24 networks are unsuccessful. What is a likely cause of this problem?

--> RIP is configured incorrectly on R1.



19. What will happen if an interface IP address is entered for the address portion of the network command in a RIPv1 configuration instead of a network address?

--> All interfaces in the same classful network as the configured address will be included in the RIPv1 routing process.


20. Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?

--> only the gateway router

CCNA2 V4.0 Exploration - Chapter 4

 Chapter 4 - Exam Answers

1. Which event will cause a triggered update?

--> a route is installed in the routing table

2. Three routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?

--> They will send updates that include only directly connected routes to their directly connected neighbors.

3. What does the RIP holddown timer do?

--> instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes

4. Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

--> updates are broadcast at regular intervals

--> broadcasts are sent to 255.255.255.255

5. Which of the following statements are correct about RIP?

--> will send out an update if there is a failure of a link

6. Which two statements describe EIGRP? (Choose two.)

--> EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.

--> EIGRP sends a partial routing table update, which includes just routes that have been changed.

7. Which statement is true regarding cisco’s RIP_JITTER variable?

--> It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.

8. What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

--> RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.

--> Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.

9. Which of the following methods does split horizon use to reduce incorrect routing information?

--> Information learned from one source is not distributed back to that source.

10. The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?

--> route poisoning

11. What is the purpose of the TTL field in the IP header?

--> limits the time or hops that a packet can traverse through the network before it should be discarded

12. Which of the following can exist in a distance vector network that has not converged? (Choose three.)

--> routing loops

--> inconsistent traffic forwarding

--> inconsistent routing table entries

13. Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?

--> The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

14. A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)

--> EIGRP only updates affected neighbors.

--> EIGRP updates are partial.

15. Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?

--> The path will be router A -> router D -> router E.

16. Which three routing protocols are distance vector routing protocols? (Choose three).

--> RIPv1

--> EIGRP

--> RIPv2

17. What is a routing loop?

--> a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destination

18. Which two conditions are most likely to cause a routing loop? (Choose two.)

--> inconsistent routing tables

--> incorrectly configured static routes

19. What metric does the RIP routing protocol consider to be infinity?

--> 16

20. What does a router running RIP do first with a new route that is received from an advertisement?

--> adjusts the metric for the new route to show the added distance for the route

21. Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?

--> 3