ICND1 OSPF Configuration 5

Question 1

Which statement correctly describes OSPF route summarization at an Area Border Router (ABR)?

Accepted Answer

The 'area range' command is used on ABRs to summarize routes between areas

Answer

The 'area range' command on an ABR aggregates Type 3 LSAs sent between areas, reducing LSDB size.

Question 2

A router's OSPF neighbor is stuck in the EXSTART state. What is the most likely cause?

Accepted Answer

MTU mismatch between the two routers

Answer

An MTU mismatch causes DBD packets to be dropped, stalling the adjacency in the ExStart/Exchange state.

Question 3

Which command manually sets the OSPF cost on an interface to 50?

Accepted Answer

ip ospf cost 50

Answer

The interface-level command 'ip ospf cost 50' directly overrides the automatically calculated OSPF cost.

Question 4

What does the 'network 10.0.0.0 0.255.255.255 area 0' command do under the OSPF process?

Accepted Answer

Enables OSPF on all interfaces with IPs matching the 10.x.x.x range and places them in area 0

Answer

The 'network' command with a wildcard mask enables OSPF on matching interfaces and assigns them to the specified area.

Question 5

Which OSPF packet type is sent to request specific LSAs that a router does not have in its LSDB?

Accepted Answer

Link-State Request (LSR)

Answer

LSR packets are sent after comparing DBDs to request specific LSAs that are missing from the local LSDB.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test