Is ARP used in the IPv6 protocol?

The correct answer is that ARP is not used in the IPv6 protocol. Instead, IPv6 employs a different mechanism called Neighbor Discovery Protocol (NDP) for the same tasks that ARP performs in IPv4. NDP is responsible for address resolution, discovering other nodes on the link, determining link-layer addresses, and managing reachability information.

By utilizing NDP, IPv6 simplifies the process of determining the link-layer address of other devices on the same network segment. This eliminates the need for a separate protocol like ARP, which can be considered less efficient in the context of the IPv6 architecture. NDP also facilitates a range of features for IPv6, such as stateless address autoconfiguration, making it more suited to the evolving internet landscape.