arp operates at which layer of the osi model
Address Resolution Protocol The Address Resolution Protocol is a request and response protocol whose messages are encapsulated by a link layer protocol. It is communicated within the boundaries of a single network, never routed across internetwork nodes. This property places ARP into the link layer of the Internet Protocol Suite.[2] Although ARP was not developed in the OSI model, it is often described here as residing in layer 3, being encapsulated by Layer 2 protocols.[citation needed]