What is ARP/RARP?

Interviewers ask about ARP (Address Resolution Protocol) and RARP (Reverse Address Resolution Protocol) to assess your technical knowledge, particularly in networking and IT. Understanding these protocols is crucial for roles that involve network management or systems administration, as they play key roles in IP address management and device communication on a network. Your ability to articulate the difference between these two protocols indicates your familiarity with foundational networking concepts.

When answering this question, first define ARP as the protocol used to map IP addresses to MAC addresses within a local network, facilitating communication between devices. You can then contrast this with RARP, which is used by a device to discover its IP address based on its MAC address. An effective response could be: "ARP helps translate an IP address into a physical address, allowing devices to communicate efficiently over Ethernet, while RARP does the opposite, enabling a device to identify its IP address using its MAC address. Understanding both protocols is instrumental in ensuring proper network functionality and management."