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