Enhancements of OSPFv3

BD

OSPFv3 (Open Shortest Path First version 3) is an interior gateway protocol (IGP) used for routing within a single autonomous system (AS) in IPv6 networks. It offers several enhancements over its predecessor OSPFv2, including:

1. Support for multiple IPv6 subnets on a single link: OSPFv3 allows multiple IPv6 subnets to be advertised on a single link, which helps to reduce the number of links required in the network. In contrast, OSPFv2 only supports a single subnet per link.

2. Routing over links rather than over networks: OSPFv3 routes packets based on link-state information, which provides more granular control over routing than OSPFv2, which routes packets based on network addresses. This allows for more efficient use of network resources and better control over routing paths.

Option A, "It requires the use of ARP," is incorrect. ARP (Address Resolution Protocol) is used to map IP addresses to MAC addresses in IPv4 networks. In IPv6 networks, Neighbor Discovery Protocol (NDP) is used instead.

Option C, "It supports up to 2 instances of OSPFv3 over a common link," is also incorrect. OSPFv3 allows for multiple instances of the protocol to run on a single router, but there is no limit on the number of instances that can be run over a common link.

Therefore, the correct answers are B and D.