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RP (Address Resolution Protocol is the standard method for finding a host’s hardware address when only its network layer address is known.
In other word, in IPv4 and Ethernet network environment, Windows operating system uses ARP to translate IP addresses to Ethernet MAC addresses.
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IPv4 over IEEE 802.3 and IEEE 802.11 is the most common usage.
In Internet Protocol Version 6 (IPv6) networks, the functionality of ARP is provided by the Neighbor Discovery Protocol (NDP).
Knowing ARP can allow you to fix this without having to go back to the location.
Outside of the classroom and interview environments, the OSI model network layers boil down mainly to layers 2, 3, and 7.
The number of times I've encountered the other layers in the real world over the last several decades amounts to only a handful. Layer 2 is the level that lower-end switches operate at, and is all about the MAC addresses.
The Address Resolution Protocol (ARP) is a communications protocol used for resolution of Internet layer addresses into link layer addresses, a critical function in the Internet protocol suite.
ARP was defined by RFC 826 in 1982, and is Internet Standard STD 37.
To confirm that it’s indeed an ARP issue, try to ping both the loopback address (127.0.0.1) and the local computer’s IP address.