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Refer to the exhibit. A Full-mesh frame relay topology network with OSPF enabled and interfaces is properly configured. OSPF routes appear in the Link State database of all the routers but network 10.10.20.0/24 does not appear in neighbor table of router R3 and network 10.10.30.0/24 does not appear in neighbor table of router R2. What can be the source of the problem?
This may no longer be covered in the Cisco Exam
IP addressing is not properly configured.
The DLCI 101 is in inactive state.
Router R1 interfaces are configured as point-to-point.
IP ospf network is not configured as "broadcast"
Either serial interface on routers R2 or R3 must be down.
If a DLCI is in inactive state R2 and R3 will not be able to ping and form a neighbor relationship. However the DR (R3) will be able to communicate with BDR (R1) because the DLCI between them is normal. The OSPF link state database appears normal because the BDR (R1) forwards it to R2, because R2 believes R1 is the DR. For more information refer to: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13696-24.html
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