ARP
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May 1, 2024
Updated May 12, 2025
26 minute read
The Address Resolution Protocol, or ARP, is a fundamental communication protocol used to discover the Layer 2 address, such as a Media Access Control (MAC) address, associated with a given Layer 3 address, typically an Internet Protocol (IP) address. Essentially, it acts as a translator between the logical IP addresses used for routing data across networks and the physical MAC addresses required for delivering data frames within a local network segment. Understanding ARP is crucial for anyone involved in networking, from IT support staff to network architects and cybersecurity professionals. This protocol ensures that devices on a local network can find and communicate with each other effectively.
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