ARP stand for?

The correct answer is Address Resolution Protocol. ARP is a fundamental network communication protocol used to map an Internet Protocol (IP) address to a physical machine address, also known as a Media Access Control (MAC) address, on a local area network.

How Address Resolution Protocol Works

• The Need for ARP: Devices on an Ethernet or Wi‑Fi network communicate using MAC addresses. When a device wants to send data to a specific IP address, it must first discover the corresponding MAC address. ARP broadcasts a request packet on the local network asking, "Who has this IP address?"
• ARP Reply: The machine with the matching IP responds with its MAC address, and the mapping is stored in the sender's ARP cache. This allows efficient communication without repeated broadcasts.
• Why Not the Others?: Automatic Routing Protocol and Advanced Resolution Process are fabricated terms. Address Routing Protocol is incorrect; the protocol resolves addresses (maps one address type to another), it does not route data like OSPF or BGP.
• ARP Spoofing: A security threat where attackers send forged ARP messages to link their MAC address with the IP of another device (like the gateway), enabling man‑in‑the‑middle attacks.

Hence, ARP stands for Address Resolution Protocol.