JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2022) — Question 23

In a stateless IPv6 auto-configuration scenario, what is the host's IPv6 address if the interface's MAC address is 12:34:ab:cd:ef:56?

Answer options

• A. fe80::1234:abff:fecd:ef56/64
• B. fe8::1234:abff:fecd:ef56/64
• C. fec0::1234:abff:fecd:ef56/64
• D. fe80::1234:abcd:ef56/64

Correct answer: A

Explanation

The correct answer is A because in stateless IPv6 auto-configuration, the link-local address is derived from the MAC address using the modified EUI-64 format, resulting in fe80::1234:abff:fecd:ef56/64. Options B and C provide incorrect address formats, while D has a slight modification in the last segment that makes it invalid.