The address resolution protocol (ARP) is used for:
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Answer: D
The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link-layer address (MAC address) associated with a given internet-layer address (IP address) within a local network.
When a host needs to send a packet to another host on the same local network, it knows the destination's IP address but requires its physical MAC address to encapsulate the packet into a data link layer frame. It broadcasts an ARP Request, and the target host replies with its MAC address.
Analysis of the options:
- Option A: Finding the IP address from a domain name is performed by the DNS (Domain Name System) protocol.
- Option B: Finding the IP address of the default gateway is typically handled via DHCP (Dynamic Host Configuration Protocol) or static configuration.
- Option C: Finding the IP address that corresponds to a MAC address is performed by RARP (Reverse ARP) or DHCP.
- Option D: Finding the MAC address that corresponds to an IP address is the fundamental purpose of ARP.
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