200-150 Question #244: Real Exam Question with Answer & Explanation

The correct answer is A: ARP. ARP (Address Resolution Protocol) is the standard protocol that resolves an IP address to a MAC address by sending a broadcast request to all devices on the local LAN segment.

Question

Refer to the exhibit. Which protocol is used to map an IP address to a MAC address by broadcasting a request to the LAN?

Exhibit

Options

AARP
Bgratuitous ARP
CRARP
Dproxy ARP

Explanation

ARP (Address Resolution Protocol) is the standard protocol that resolves an IP address to a MAC address by sending a broadcast request to all devices on the local LAN segment.

Common mistakes.

B. Gratuitous ARP is a special ARP request where a host uses its own IP as the target to announce its presence or update neighbor ARP caches after an IP or MAC change, not to discover another device's MAC address.
C. RARP (Reverse ARP) performs the opposite operation - it maps a known MAC address to an unknown IP address, and was historically used by diskless workstations to obtain their IP address at boot time.
D. Proxy ARP is a router technique where a router responds to ARP requests on behalf of hosts on a different subnet, enabling communication across network boundaries without a default gateway configured on the client.

Concept tested. ARP IP-to-MAC address resolution via broadcast

Reference. https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipam/manage-resources-in-multiple-active-directory-forests

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