1.4.2 Module Quiz – Single-Area OSPFv2 Concepts Answers
1. What is a function of OSPF hello packets?
- to discover neighbors and build adjacencies between them
- to ensure database synchronization between routers
- to send specifically requested link-state records
- to request specific link-state records from neighbor routers
2. Which OPSF packet contains the different types of link-state advertisements?
3. Which three statements describe features of the OSPF topology table? (Choose three.)
- After convergence, the table only contains the lowest cost route entries for all known networks.
- The topology table contains feasible successor routes.
- The table can be viewed via the show ip ospf database command.
- Its contents are the result of running the SPF algorithm.
- It is a link-state database that represents the network topology.
- When converged, all routers in an area have identical topology tables.
4. What does an OSPF area contain?
- routers that share the same process ID
- routers that share the same router ID
- routers that have the same link-state information in their LSDBs
- routers whose SPF trees are identical
5. A router is participating in an OSPFv2 domain. What will always happen if the dead interval expires before the router receives a hello packet from an adjacent DROTHER OSPF router?
- A new dead interval timer of 4 times the hello interval will start.
- SPF will run and determine which neighbor router is “down”.
- OSPF will run a new DR/BDR election.
- OSPF will remove that neighbor from the router link-state database.
6. What is the order of packet types used by an OSPF router to establish convergence?
- LSAck, Hello, DBD, LSU, LSR
- LSU, LSAck, Hello, DBD, LSR
- Hello, DBD, LSR, LSU, LSAck
- Hello, LSAck, LSU, LSR, DBD
7. What is a feature of the OSPF routing protocol?
- OSPF authentication is configured in the same way on IPv4 and IPv6 networks.
- Routers can be grouped into autonomous systems to support a hierarchical system.
- It scales well in both small and large networks.
- The SPF algorithm chooses the best path based on 30-second updates.
8. What is used to create the OSPF neighbor table?
- link-state database
- forwarding database
- routing table
- adjacency database
9. What is identical on all OSPF routers within a single area?
- neighbor table
- routing table
- link-state database
- static routes
10. What function is performed by the OSPF designated router?
- summarizing routes between areas
- maintaining the link-state database
- redistribution of external routes into OSPF
- dissemination of LSAs
11. What are two reasons for creating an OSPF network with multiple areas? (Choose two.)
- to simplify configuration
- to ensure that an area is used to connect the network to the Internet
- to reduce use of memory and processor resources
- to reduce SPF calculations
- to provide areas in the network for routers that are not running OSPF
12. At which OSPF state are neighbor routers converged and able to exchange routing updates?
13. 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?
- 30 seconds
- 60 seconds
- 45 seconds
- 15 seconds
14. What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency?
- They exchange abbreviated lists of their LSDBs.
- They negotiate the election process if they are on a multiaccess network.
- They exchange DBD packets in order to advertise parameters such as hello and dead intervals.
- They request more information about their databases.
15. Which statement is correct about multiarea OSPF?
- OSPF can consolidate a fragmented OSPF area into one large area.
- Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers.
- All routers are in one area called the backbone area (area 0).
- OSPF multiarea increases the frequency of SPF calculation.