What is ARP used for in IPv4 networks?

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Prepare for the Navy IT Communications Part 5 Test. Study effectively with multiple-choice questions, detailed explanations, and expert tips. Ace your exam with confidence!

Multiple Choice

What is ARP used for in IPv4 networks?

Explanation:
ARP is the mechanism that translates an IPv4 address into a MAC address on the local network. When a host needs to send a frame to another device on the same LAN, it must know the destination’s MAC address. It sends an ARP request broadcast asking “Who has this IPv4 address?” and the device with that address replies with its MAC. The sender caches this mapping and uses the MAC to deliver the Ethernet frame. This only works within the local network segment because routers don’t forward ARP requests. ARP does not handle routing decisions or encryption; its sole role is IP-to-MAC mapping for local delivery.

ARP is the mechanism that translates an IPv4 address into a MAC address on the local network. When a host needs to send a frame to another device on the same LAN, it must know the destination’s MAC address. It sends an ARP request broadcast asking “Who has this IPv4 address?” and the device with that address replies with its MAC. The sender caches this mapping and uses the MAC to deliver the Ethernet frame. This only works within the local network segment because routers don’t forward ARP requests. ARP does not handle routing decisions or encryption; its sole role is IP-to-MAC mapping for local delivery.

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