101 · Question #531

What is used to resolve IP address to MAC address mappings?

The correct answer is B. ARP. ARP (Address Resolution Protocol) is the Layer 2 protocol responsible for mapping a known IP address to its corresponding MAC address on a local network.

Section 1: OSI Model, Network, and Application Delivery Basics

Question

Options

ADHCP
BARP
CDNS
DICMP

How the community answered

(52 responses)

A
2% (1)
B
88% (46)
C
2% (1)
D
8% (4)

Why each option

ARP (Address Resolution Protocol) is the Layer 2 protocol responsible for mapping a known IP address to its corresponding MAC address on a local network.

ADHCP

DHCP dynamically assigns IP addresses to hosts but does not resolve IP-to-MAC mappings.

BARPCorrect

ARP operates at Layer 2 by broadcasting a request asking 'who has this IP?' and the device with that IP replies with its MAC address. This mapping is cached in the ARP table for future use, enabling Layer 2 frame delivery on the same subnet.

CDNS

DNS resolves human-readable hostnames to IP addresses, not IP addresses to MAC addresses.

DICMP

ICMP is used for network diagnostics and error reporting such as ping, not address resolution.

Concept tested: ARP IP-to-MAC address resolution protocol

Source: https://www.cisco.com/c/en/us/support/docs/ip/address-resolution-protocol-arp/13718-5.html

Topics

#ARP#IP to MAC resolution#address resolution#Layer 2

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