Cisco CCNA Single-Area OSPFv2 Configuration 2

Question 1

A router is configured with 'router ospf 1' and 'network 10.1.1.0 0.0.0.255 area 0'. What does the wildcard mask 0.0.0.255 specify?

Accepted Answer

Any interface with an IP in the 10.1.1.0/24 range participates in OSPF

Answer

The wildcard mask 0.0.0.255 matches any IP address in the 10.1.1.0/24 range, enabling OSPF on those interfaces.

Question 2

Which OSPF packet type is used to discover and maintain neighbor relationships?

Accepted Answer

Hello

Answer

Hello packets are sent periodically to discover neighbors and maintain adjacencies by confirming the neighbor is still reachable.

Question 3

What is the default OSPF Hello interval on a broadcast multi-access network?

Accepted Answer

10 seconds

Answer

The default Hello interval on broadcast multi-access networks (like Ethernet) is 10 seconds.

Question 4

A network administrator uses 'ip ospf 1 area 0' on an interface instead of the 'network' command. What is the result?

Accepted Answer

Only that specific interface is enabled for OSPF area 0

Answer

The interface-level 'ip ospf process-id area area-id' command enables OSPF directly on that specific interface.

Question 5

What happens when two OSPF neighbors have mismatched Hello intervals?

Accepted Answer

The routers will not form an OSPF adjacency

Answer

OSPF requires Hello and Dead intervals to match between neighbors; mismatched timers prevent adjacency formation.

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