200-301: Cisco Certified Network AssociateDemo

Question

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Refer to the exhibit.

An engineer must configure router R1 so it establishes an OSPF single-area neighbor relationship with R2. Which command sequence should be implemented on the router?

A router ospf 100 network 10.0.0.0 0.0.0.252 area0 network 10.0.1.0 0.0.0.255 area0
B router ospf 100 network 10.0.0.0 0.0.0.3 area0 network 10.0.2.0 255.255.255.0 area0
C router ospf 10 network 10.0.0.0 0.0.0.3 area0 network 10.0.1.0 0.0.0.255 area0
D router ospf 10 network 10.0.0.0 0.0.0.3 area0 network 10.0.2.0 0.0.0.255 area0

Explanation

To form the OSPF adjacency, R1 must enable OSPF on the shared link to R2, which is network 10.0.0.0/30 and therefore uses wildcard mask 0.0.0.3. R1 must also advertise its own local LAN, 10.0.1.0/24, using wildcard mask 0.0.0.255, in the same area. The OSPF process ID has only local significance, so using process 10 on R1 is valid even if another router uses a different local process number. Options that reference 10.0.2.0 configure R2’s LAN instead of R1’s, and options with incorrect masks will not match the intended interfaces.

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OSPF Configuration Guide

200-301: Cisco Certified Network AssociateDemo

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