An engineer is auditing a list of IPv6 addresses assigned across a campus and must flag those that are globally routable unicast addresses, meaning they fall within the 2000::/3 range reserved for global unicast. Which two addresses qualify? Select TWO.
- A2001:db8:acad:10::1, configured statically on a server interface for external reachability Correct
- Bfe80::21a:2bff:fe3c:4d5e, formed automatically on the interface at boot time
- C2400:cb00:2049:1::a29f:1804, allocated from a provider block for internet hosts Correct
- Dff02::1, used to reach every node listening on the local link segment
- Efd00:1234:5678:9abc::1, generated locally for traffic that stays inside the site
Why A is correct: Its leading bits place it inside 2000::/3, the block defined for global unicast, so it is a globally routable unicast address.
Why B is wrong: An address beginning fe80 sits in fe80::/10 and is link-local only, valid on a single segment and never routed globally, so it is not global unicast.
Why C is correct: It begins with 2400, which lies within 2000::/3, marking it a global unicast address suitable for routing across the internet.
Why D is wrong: Any address starting ff00::/8, including ff02::1, is multicast rather than unicast, so it identifies a group of receivers and cannot be a global unicast address.
Why E is wrong: The fd prefix falls in fc00::/7, the unique local range that is private to a site and not advertised on the internet, so it is not global unicast.