(Part 3/3) Modules 1 – 2: OSPF Concepts and Configuration

39. What is a benefit of multiarea OSPF routing?

• Topology changes in one area do not cause SPF recalculations in other areas.

• • Routers in all areas share the same link-state database and have a complete picture of the entire network.

• • A backbone area is not required.

• • Automatic route summarization occurs by default between areas.

40. Match the OSPF state with the order in which it occurs. (Not all options are used.)

• FIRST STATE: down state

  SECOND STATE: init state

• THIRD STATE: two-way state

  FOURTH STATE: exstart state

• FIFTH STATE: exchange state

  SIXTH STATE: loading state

• SEVENTH STATE: full state

41. What indicates to a link-state router that a neighbor is unreachable?

• if the router no longer receives hello packets

• • if the router receives an update with a hop count of 16

• • if the router receives an LSP with previously learned information

• • if the router no longer receives routing updates

42. Which three OSPF states are involved when two routers are forming an adjacency? (Choose three.)

• Exchange

• Init

• ExStart

• Two-way

• Down

43. Refer to the exhibit. Suppose that routers B, C, and D have a default priority, and router A has a priority 0. Which conclusion can be drawn from the DR/BDR election process?

• • If the priority of router C is changed to 255, then it will become the DR.

• • If the priority of router C is changed to 255, then it will become the DR.

• If the DR fails, the new DR will be router B.

• • If a new router with a higher priority is added to this network, it will become the DR.

44. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 64.102.0.0 255.255.255.128. What wildcard mask would the administrator use in the OSPF network statement?

• • 0.0.31.255

• • 0.0.0.63

• • 0.0.63.255

• • 0.0.0.127

45. Which command will a network engineer issue to verify the configured hello and dead timer intervals on a point-to-point WAN link between two routers that are running OSPFv2?

• • show ipv6 ospf interface serial 0/0/0

• • show ip ospf neighbor

• • show ip ospf interface fastethernet 0/1

• show ip ospf interface serial 0/0/0

46. An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 128.107.0.0 255.255.255.192. What wildcard mask would the administrator use in the OSPF network statement?

• • 0.0.63.255

• • 0.0.0.63

• • 0.0.0.3

• • 0.0.0.7

Establish and maintain adjacencies

• hello packet

• link-state update packet

• database description packet

• link-state request packet

Advertise new information

• hello packet

• link-state update packet

• database description packet

• link-state request packet