Which two statements are correct about neighbor discovery in IPv6? (Choose two.)
Click on the arrows to vote for the correct answer
A. B. C. D.BD
The correct answers are B and D.
IPv6 uses Neighbor Discovery Protocol (NDP) instead of ARP for neighbor discovery. NDP is responsible for finding neighbors on a local link and maintaining address mappings of neighboring nodes.
Neighbor solicitation (NS) and neighbor advertisement (NA) messages are used by NDP for neighbor discovery. When a node wants to determine the link-layer address of a neighboring node or verify its reachability, it sends an NS message to the solicited-node multicast address of the target node. The target node responds with an NA message containing its link-layer address.
Option A is incorrect because neighbor discovery in IPv6 does not rely on ARP. ARP is used in IPv4 for neighbor discovery and resolution.
Option B is correct because a neighbor is considered reachable when it responds to a neighbor solicitation message. A neighbor may also be considered reachable if it sends unsolicited neighbor advertisements to indicate its reachability.
Option C is incorrect because router solicitation messages are used by nodes to discover routers on the link and obtain network configuration information. They are not used for neighbor discovery.
Option D is correct because NDP is used for neighbor discovery in IPv6, and not ARP.