What is the RFC number for ARP?

What is the RFC number for ARP?

• A. 768
• B. 826
• C. 1034
• D. 202

Answer: (B)

ARP is defined in RFC 826. That document formalizes how a host on a local network maps an IPv4 address to a MAC (hardware) address, enabling IP packets to be delivered over a LAN. It describes the broadcast request “Who has this IP address? Tell the MAC address of the requester” and the reply that provides the matching MAC. It also introduces the ARP cache to speed future lookups. The other numbers correspond to different standards. For example, UDP is defined in RFC 768, and DNS-related concepts are in RFC 1034/1035, so those numbers aren’t ARP.

ARP is defined in RFC 826. That document formalizes how a host on a local network maps an IPv4 address to a MAC (hardware) address, enabling IP packets to be delivered over a LAN. It describes the broadcast request “Who has this IP address? Tell the MAC address of the requester” and the reply that provides the matching MAC. It also introduces the ARP cache to speed future lookups.

The other numbers correspond to different standards. For example, UDP is defined in RFC 768, and DNS-related concepts are in RFC 1034/1035, so those numbers aren’t ARP.