Review Questions The following questions are designed to test your understanding of this chapter s material. For more information on how to get additional questions, please see www.lammle.com/ccn a. You can find the answers to these questions in Appendix B, Answers to Review Questions. 1. Which of the following are scalability issues with single-area OSPF networks? (Choose all that apply.) A. Size of the routing table B. Size of the OSPF database C. Maximum hop-count limitation D. Recalculation of the OSPF database 2. Which of the following describes a router that connects to an external routing process (e.g., EIGRP)? A. ABR B. ASBR C. Type 2 LSA D. Stub router 3. Which of the following must match in order for an adjacency to occur between routers? (Choose three.) A. Process ID B. Hello and dead timers C. Link cost D. Area E. IP address/subnet mask 4. In which OSPF state do two routers forming an adjacency appear as in the show ip ospf neighbor output after adding neighbors into the table and exchanging hello information? A. ATTEMPT B. INIT C. 2WAY D. EXSTART E. FULL
5. You need to set up a preferred link that OSPF will use to route information to a remote network. Which command will allow you to set the interface link as preferred over another? A. ip ospf preferred 10 B. ip ospf priority 10 C. ospf bandwidth 10 D. ip ospf cost 10 6. When would a router s neighbor table show the FULL/DR state? A. After the first Hello packets are received by a neighbor B. When all information is synchronized among adjacent neighbors C. When the router s neighbor table is too full of information and is discarding neighbor information D. After the EXSTART state 7. Which is/are true regarding OSPFv3? (Choose all that apply.) A. You must add network statements under the OSPF process. B. There are no network statements in OSPFv3 configurations. C. OSPFv3 uses a 128-bit RID. D. If you have IPv4 configured on the router, it is not mandatory that you configure the RID. E. If you don t have IPv4 configured on the router, it is mandatory that you configure the RID. F. OSPFv3 doesn t use LSAs like OSPFv2 does. 8. When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state? A. EXSTART state > LOADING state > EXCHANGE state > FULL state B. EXSTART state > EXCHANGE state > LOADING state > FULL state C. EXSTART state > FULL state > LOADING state > EXCHANGE state D. LOADING state > EXCHANGE state > FULL state > EXSTART state 9. Which type of LSA is generated by DRs and referred to as a network link advertisement (NLA)? A. Type 1 B. Type 2 C. Type 3 D. Type 4 E. Type 5
10. Which type of LSA is generated by ABRs and is referred to as a summary link advertisement (SLA)? A. Type 1 B. Type 2 C. Type 3 D. Type 4 E. Type 5 11. Which command will show all the LSAs known by a router? A. show ip ospf B. show ip ospf neighbor C. show ip ospf interface D. show ip ospf database 12. Using the following illustration, what is the cost from R1 s routing table to reach the network with Server 1? Each Gigabit Ethernet link has a cost of 4, and each serial link has a cost of 15. A. 100 B. 23 C. 64 D. 19 E. 27 13. Using the following illustration, which of the following are true? (Choose all that apply.) A. R1 is an internal router. B. R3 would see the networks connected to the R1 router as an inter-area route. C. R2 is an ASBR. D. R3 and R4 would receive information from R2 about the backbone area, and the same LSA information would be in both LSDBs. E. R4 is an ABR.
14. Which of the following could cause two routers to not form an adjacency? (Choose all that apply.) A. They are configured in different areas. B. Each router sees the directly connected link as different costs. C. Two different process IDs are configured. D. ACL is configured on the routing protocol. E. There is an IP address/mask mismatch. F. Passive interface is configured. G. They both have been configured with the same RID. 15. Which of the following IOS commands shows the state of an adjacency with directly connected routers? A. debug ospf events B. show ip ospf border-routers C. show ip ospf neighbor D. show ip ospf database 16. What command will show you the DR and DBR address of the area you are connected to directly with an interface? A. show interface s0/0/0 B. show interface fa0/0 C. show ip ospf interface s0/0/0 D. show ip ospf interface fa0/0 17. Which of the following could be causing a problem with the Corp router not forming an adjacency with its neighbor router? (Choose all that apply.) A. The routers are configured with the wrong network statements. B. They have different maximum paths configured. C. There is a passive interface configured. D. There is an ACL set stopping Hellos. E. The costs of the links between the routers are configured differently. F. They are in different areas.
18. Which of the following is/are true? (Choose all that apply.) A. The reference bandwidth for OSPF and OSPFv3 is 1. B. The reference bandwidth for OSPF and OSPFv3 is 100. C. You change the reference bandwidth from global config with the command autocost reference bandwidth number. D. You change the reference bandwidth under the OSPF router process with the command auto-cost reference bandwidth number. E. Only one router needs to set the reference bandwidth if it is changed from its default. F. All routers in a single area must set the reference bandwidth if it is changed from its default. G. All routers in the AS must set the reference bandwidth if it is changed from its default. 19. Which two statements about the OSPF router ID are true? (Choose two.) A. It identifies the source of a Type 1 LSA. B. It should be the same on all routers in an OSPF routing instance. C. By default, the lowest IP address on the router becomes the OSPF router ID. D. The router automatically chooses the IP address of a loopback as the OSPF router ID. E. It is created using the MAC address of the loopback interface. 20. What are two benefits of using a single OSPF area network design? (Choose two.) A. It is less CPU intensive for routers in the single area. B. It reduces the types of LSAs that are generated. C. It removes the need for virtual links. D. It increases LSA response times. E. It reduces the number of required OSPF neighbor adjacencies.