JNCIA-Junos: Juniper Networks Certified Associate – Junos (2022) — Question 63

Which protocol is responsible for learning an IPv6 neighbor's MAC address?

Answer options

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

Correct answer: C

Explanation

The correct answer is C, as the Neighbor Discovery Protocol (NDP) is specifically designed to find the link-layer addresses (MAC addresses) for IPv6 neighbors. Option A, Address Resolution Protocol (ARP), is used for IPv4 and does not apply to IPv6. Options B and D, MACsec and NAT, serve different purposes and do not involve MAC address discovery.