OSPF Configuration Flashcards
7 cards from real ICND1 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 OSPF Configuration flashcards as text
What is the default OSPF dead interval on a broadcast network?
Answer: 40 seconds
The default dead interval is 40 seconds, which is 4 times the default hello interval of 10 seconds.
Which command configures a passive interface in OSPF, preventing hello packets from being sent out that interface?
Answer: passive-interface GigabitEthernet0/0
The 'passive-interface' command under the OSPF process stops hellos on that interface while still advertising the connected network.
Which OSPF LSA type describes a router's directly connected links within an area?
Answer: Type 1 (Router LSA)
Type 1 Router LSAs are generated by every OSPF router and describe that router's links within the area.
What is the purpose of the 'area 0' designation in OSPF?
Answer: It is the backbone area that all other areas must connect to
Area 0 is the OSPF backbone area, and all other areas must connect to it either directly or via a virtual link.
A router running OSPF has a cost of 10 on Fa0/0 and 100 on Fa0/1. Which path will OSPF prefer to reach a remote network?
Answer: Fa0/0 because OSPF prefers lower cost
OSPF uses the lowest cumulative cost path, so the interface with cost 10 is preferred over cost 100.
Which command displays the OSPF neighbor table on a Cisco router?
Answer: show ip ospf neighbor
'show ip ospf neighbor' displays the neighbor ID, state, dead time, and interface for each OSPF neighbor.
What does it mean when a neighbor shows 'FULL/DR' in the 'show ip ospf neighbor' output?
Answer: The neighbor is fully adjacent and is the Designated Router
FULL/DR means the router has reached full adjacency with that neighbor, which is the Designated Router on the segment.