Module 1 - Single-Area OSPFv2 Concepts

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

Which OPSF packet contains the different types of link-state advertisements?

• • LSU

• • LSR

• hello

• • DBD

• • LSAck

Which 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.

• • It is a link-state database that represents the network topology.

• • When converged, all routers in an area have identical topology tables.

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

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.

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

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.

What is used to create the OSPF neighbor table?

• • link-state database

• • forwarding database

• • routing table

• • adjacency database

What is identical on all OSPF routers within a single area?

• • neighbor table

• • routing table

• • link-state database

• • static routes

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