CNT160: Chapter 1 Module Quiz

Which OSPF packet contains the different types of link-state advertisements? LSR DBD LSAck hello LSU

LSU

What are two reasons for creating an OSPF network with multiple areas? (Choose two.) to reduce use of memory and processor resources to provide areas in the network for routers that are not running OSPF to ensure that an area is used to connect the network to the Internet to reduce SPF calculations to simplify configuration

to reduce use of memory and processor resources to reduce SPF calculation

What function is performed by the OSPF designated router? summarizing routes between areas redistribution of external routes into OSPF maintaining the link-state database dissemination of LSAs

Dissemination of LSAs

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 60 seconds 30 seconds 45 seconds

60 seconds

Which statement is correct about multiarea OSPF? OSPF can consolidate a fragmented OSPF area into one large area. OSPF multiarea increases the frequency of SPF calculation. 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).

Arranging routers into areas partitions a large autonomous system in order to lighten the load on routers.

At which OSPF state are neighbor routers converged and able to exchange routing updates? ExStart Full Exchange Two-Way

Full

What is the order of packet types used by an OSPF router to establish convergence? Hello, DBD, LSR, LSU, LSAck LSU, LSAck, Hello, DBD, LSR Hello, LSAck, LSU, LSR, DBD LSAck, Hello, DBD, LSU, LSR

Hello, DBD, LSR, LSU, LSAck

Which three statements describe features of the OSPF topology table? (Choose three.) It is a link-state database that represents the network topology. The table can be viewed via the show ip ospf database command. The topology table contains feasible successor routes. After convergence, the table only contains the lowest cost route entries for all known networks. When converged, all routers in an area have identical topology tables. Its contents are the result of running the SPF algorithm.

It is a link-state database that represents the network topology. The table can be viewed via the show ip ospf database command. When converged, all routers in an area have identical topology tables.

What is a feature of the OSPF routing protocol?​ The SPF algorithm chooses the best path based on 30-second updates​. It scales well in both small and large networks. 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

What is identical on all OSPF routers within a single area? static routes link-state database neighbor table routing table

Link-state database

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? OSPF will remove that neighbor from the router link-state database. OSPF will run a new DR/BDR election. SPF will run and determine which neighbor router is "down". A new dead interval timer of 4 times the hello interval will start.

OSPF will remove that neighbor from the router link-state database.

What happens immediately after two OSPF routers have exchanged hello packets and have formed a neighbor adjacency? They negotiate the election process if they are on a multiaccess network. They request more information about their databases. They exchange DBD packets in order to advertise parameters such as hello and dead intervals. They exchange abbreviated lists of their LSDBs.

They exchange abbreviated lists of their LSDBs

What is used to create the OSPF neighbor table? link-state database adjacency database forwarding database routing table

adjacency database

What does an OSPF area contain? routers that have the same link-state information in their LSDBs routers that share the same router ID routers that share the same process ID routers whose SPF trees are identical

routers that have the same link-state information in their LSDBs

What is a function of OSPF hello packets? to discover neighbors and build adjacencies between them to send specifically requested link-state records to ensure database synchronization between routers to request specific link-state records from neighbor routers

to discover neighbors and build adjacencies between them