The address resolution protocol (ARP) is a protocol used by IPv4 to map IP network addresses to the hardware addresses used by a data link protocol. The protocol operates below the network layer as a part of the interface between the network and link layers.
Ethernet switches are a link layer device that takes an active role in storing and forwarding Ethernet frames by examining incoming frames MAC address and selectively forwarding frame to one or more outgoing links when frame is to be forwarded on segment. Uses CSMA/CD to access segment.
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