What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)
A . It requires the use of AR
C . It can support multiple IPv6 subnets on a single link.
D . It supports up to 2 instances of OSPFv3 over a common link.
E . It routes over links rather than over networks.

Answer: B, D

Explanation:

Here is a list of the differences between OSPFv2 and OSPFv3:

They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols

OSPFv3 introduces new LSA types

OSPFv3 has different packet format

OSPFv3 uses different flooding scope bits (U/S2/S1)

OSPFv3 adjacencies are formed over link-local IPv6 communications

OSPFv3 runs per-link rather than per-subnet

OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)

OSPFv3 Neighbor Authentication done with IPsec (AH)

OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html

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