What is the primary function of the Address Resolution Protocol (ARP) in a local area network?
Answer and explanation
Correct answer: C. Mapping a known IPv4 address to its corresponding physical MAC hardware address
- Step 1: Trace Layer 2 / Layer 3 address resolution on Ethernet local networks.
- Step 2: When a host knows the destination IP on the local subnet but lacks the Layer 2 hardware address, it broadcasts an ARP request to determine the physical MAC address.
Answer
Mapping a known IPv4 address to its corresponding physical MAC hardware address.
Why not the others: DNS translates domain names; DHCP configures subnets; IPsec/TLS encrypts payloads.
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