Chapter 10

1: Why are loopback interfaces advertised as /32 in OSPF?
A1: Answer: Loopback interfaces are considered host routes in OSPF.
2: What are the route types used with OSPF?
A2: Answer: Intra-area routes, inter-area routes, external routes Type 1, and external routes Type 2
3: Why do I receive the “cannot allocate router id” error message?
A3: Answer: OSPF chooses the highest IP address as its router ID. If none of your interfaces are in the up/up mode and configured with an IP address, OSPF returns this error message. Using a loopback interface prevents this error.
4: Why do I receive the “unknown routing protocol” error message?
A4: Answer: This message is most frequently caused by your selection of Cisco IOS Software that does not support ...

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