NDP functions primarily in which layer of the OSI model?

NDP, or Neighbor Discovery Protocol, operates primarily at the Network Layer of the OSI model. This protocol is fundamental in IPv6 networks, and its primary functions include discovering other network devices, determining their link-layer addresses, and maintaining reachability information about the active neighbors on a local link.

At the Network Layer, the focus is on the handling of packets between devices across a diverse network. NDP facilitates the exchange of information necessary for efficient routing and communication within an IPv6 architecture. By discovering neighboring devices, it enables devices to establish connections and enables functions such as address autoconfiguration and the detection of duplicate addresses.

While other layers such as the Data Link Layer handle the physical addressing and the actual transmission of frames, NDP's responsibilities are more concerned with device communication and management at the logical addressing level found in the Network Layer. Thus, identifying NDP as functioning at the Network Layer highlights its role in ensuring effective network communication in IPv6 environments.