JNCIA-Junos: Juniper Networks Certified Associate – Junos (2024) — Question 11

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

Answer options

• A. Neighbor Discovery Protocol (NDP)
• B. Address Resolution Protocol (ARP)
• C. Media Access Control Security (MACsec)
• D. Network Address Translation (NAT)

Correct answer: B

Explanation

The Address Resolution Protocol (ARP) is the correct answer because it is specifically designed to map an IPv4 address to a MAC address within a local network. The other options, such as NDP, are used for IPv6 address resolution, while MACsec is focused on securing data at the MAC layer, and NAT is used for translating IP addresses, not for resolving MAC addresses.