Networking 3 (SA1)

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.

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

• 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.

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 linkstate 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