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Address Resolution Protocol maps IP addresses to MAC (hardware) addresses on a local network. When a device needs to communicate with another device on the same subnet, it broadcasts an ARP request asking "who has this IP?" The target responds with its MAC address, which gets cached locally.
ARP spoofing (or poisoning) is a classic man-in-the-middle attack on local networks. Attackers send forged ARP replies to redirect traffic through their machine. SOC analysts detect ARP anomalies in network traffic. Security engineers deploy dynamic ARP inspection on switches to prevent these attacks.
Looking for the acronym? Read about ARP in the cybersecurity acronym decoder
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Address Resolution Protocol maps IP addresses to MAC (hardware) addresses on a local network. When a device needs to communicate with another device on the same subnet, it broadcasts an ARP request asking "who has this IP?" The target responds with its MAC address, which gets cached locally.
ARP spoofing (or poisoning) is a classic man-in-the-middle attack on local networks. Attackers send forged ARP replies to redirect traffic through their machine. SOC analysts detect ARP anomalies in network traffic. Security engineers deploy dynamic ARP inspection on switches to prevent these attacks.
Cybersecurity professionals who work with ARP include SOC Analyst, Penetration Tester, Security Engineer. These roles apply ARP knowledge within the Networking & Infrastructure domain.
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
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