OSPFv3 and OSPFv2 Comparison

A.

OSPF (Open Shortest Path First) is a routing protocol that is used to exchange routing information within an Autonomous System (AS). OSPF has two versions, OSPFv2 and OSPFv3.

A. OSPFv3 supports multiple instances, and OSPFv2 does not.

• This statement is true. OSPFv3 supports multiple instances with the instance ID, while OSPFv2 does not support multiple instances.

B. OSPFv3 and OSPFv2, by default, include all address prefixes on an interface.

• This statement is false. Both OSPFv3 and OSPFv2 by default include only the IP address assigned to the interface on which OSPF is enabled.

C. OSPFv2 supports only IPv4 prefix advertisement, and OSPFv3 supports only IPv6 prefix advertisement.

• This statement is false. OSPFv2 supports IPv4 and OSPFv3 supports IPv6, but OSPFv2 also supports IPv6 using the OSPFv3 Address Family Identifiers (AFIs).

D. OSPFv3 does not support NBMA (Non-Broadcast Multi-Access) interfaces, and OSPFv2 does.

• This statement is false. OSPFv3 supports NBMA interfaces and provides a solution for the issues with NBMA networks that OSPFv2 had. OSPFv3 uses a new concept called the "point-to-multipoint interface" to support NBMA networks.

In conclusion, the only true statement about OSPFv3 and OSPFv2 is that OSPFv3 supports multiple instances, while OSPFv2 does not.