312-50V9 Question #375: Real Exam Question with Answer & Explanation

The correct answer is D: It sends a request packet to all the network elements, asking for the MAC address from a specific. ARP resolves IP addresses to MAC addresses by broadcasting a request packet to all devices on the local network segment.

Question

Which of the following BEST describes how Address Resolution Protocol (ARP) works?

Options

AIt sends a reply packet for a specific IP, asking for the MAC address
BIt sends a reply packet to all the network elements, asking for the MAC address from a specific IP
CIt sends a request packet to all the network elements, asking for the domain name from a specific
DIt sends a request packet to all the network elements, asking for the MAC address from a specific

Explanation

ARP resolves IP addresses to MAC addresses by broadcasting a request packet to all devices on the local network segment.

Common mistakes.

A. ARP sends a REQUEST packet outbound, not a reply, and the request is broadcast to all network elements rather than sent to a specific device.
B. ARP sends a REQUEST packet (not a reply) to all network elements - the reply only comes from the single device that owns the queried IP address.
C. ARP resolves IP addresses to MAC addresses, not domain names - domain name resolution is the function of DNS (Domain Name System).

Concept tested. ARP broadcast request and IP-to-MAC resolution

Reference. https://www.rfc-editor.org/rfc/rfc826

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