CCNA 2 Routing and Switching Essentials v5 Chapter 8: Single-Area OSPF – Check Your Understanding Questions Answers
1. What will an OSPF router prefer to use first as a router ID?
- Any IP address that is configured using the router-id command
- A loopback interface that is configured with the highest IP address on the router
- The highest active interface IP that is configured on the router
- The highest active interface that participates in the routing process because of a specifically configured network statement
2. At which OSPF state are neighbor routers converged and can exchange routing updates?
- Two-Way
- ExStart
- Exchange
- Full
3. Which OSPF wildcard mask would be appropriate to use for the given network prefix?
- /30 and 0.0.0.2
- /13 and 0.7.255.255
- /23 and 0.0.2.255
- /18 and 0.0.64.255
4. Which statement is correct about multiarea OSPF?
- OSPF can consolidate a fragmented OSPF area into one large area.
- All routers are in one area called the backbone area (area 0).
- Arranging routers into areas partitions a large autonomous system to lighten the load on routers.
- OSPF multiarea increases the frequency of SPF calculation.
5. A network technician issues the following commands when configuring a router:
R1(config)# router ospf 11 R1(config-router)# network 10.10.10.0 0.0.0.255 area 0
What does the number 11 represent?
- The autonomous system number to which R1 belongs
- The area number where R1 is located
- The cost of the link to R1
- The OSPF process ID on R1
- The administrative distance that is manually assigned to R1
6. The OSPF Hello timer has been set to 15 seconds on a router in a point-to-point network. By default, what is the dead interval on this router?
- 15 seconds
- 30 seconds
- 45 seconds
- 60 seconds
7. A network administrator configures a loopback interface as the OSPF router ID with the IP address of 192.168.1.1/30. What could be the consequence of using this 30-bit mask for the loopback interface?
- Older routers do not recognize the router-id command.
- The interface is not enabled for OSPF.
- OSPF routers must also be configured with a router priority value.
- This loopback interface may be advertised as a reachable network.
8. What are three entries that are displayed by the show ip ospf neighbor command? (Choose three.)
- The route metric and neighbor next-hop address
- The router ID of the neighboring routers
- The OSPF state of each interface
- The OSPF process ID used to establish the adjacency
- The OSPF area number shared by the neighbor routers
- The IP address of the neighbor router interface to which this router is directly connected
9. Which statement describes a difference or similarity between OSPFv2 and OSPFv3?
- OSPFv2 requires the DR/BDR election to occur on multiaccess networks only, whereas OSPv3 requires DR/BDR elections for all network types.
- Both OSPFv2 and OSPFv3 use the router configuration network command to advertise networks.
- Both OSPFv2 and OSPFv3 use multicast destination addresses for link-state packets.
- OSPFv2 uses a 32-bit router ID and OSPFv3 uses a 128 bit router ID.
10. Refer to the exhibit. With the default metric settings, the OSPF cost for R1 to reach the network 172.16.1.0 is
- 64
- 1563
- 65
- 1564
- 10
- 1