JN0-105 Question #28: Real Exam Question with Answer & Explanation

The correct answer is A. Address Resolution Protocol (ARP). The Address Resolution Protocol (ARP) is a fundamental protocol used in IPv4 networking to map an IP address to its corresponding MAC (Media Access Control) address. When an IPv4 device wants to communicate with another device on the same local network, it uses ARP to find out th

Question

Which protocol is responsible for learning an IPv4 neighbor's MAC address?

Options

AAddress Resolution Protocol (ARP)
BNetwork Address Translation (NAT)
CMedia Access Control Security (MACsec)
DNeighbor Discovery Protocol (NDP)

Explanation

The Address Resolution Protocol (ARP) is a fundamental protocol used in IPv4 networking to map an IP address to its corresponding MAC (Media Access Control) address. When an IPv4 device wants to communicate with another device on the same local network, it uses ARP to find out the MAC address associated with the target device's IP address. This ensures that IP packets can be encapsulated into Ethernet frames and delivered to the correct hardware address on the local network segment. ARP does not apply to IPv6, where Neighbor Discovery Protocol (NDP) performs a similar function.

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