Which IPv6 configuration on interface VLAN 2000 creates a locally unique, routable address that won’t be advertised to the Internet?

The correct answer is interface vlan 2000 ipv6 address fd00::1234:2343/64 because fd00::/8 is the prefix for Unique Local Addresses (ULAs) in IPv6. ULAs are routable within a private network but are not intended to be routed on the global Internet, making them locally unique. ff00::/8 is a multicast address range, not for unicast interface assignment. fe80::/10 is the prefix for Link-Local Addresses, which are only routable on the local link and not beyond. fc00::/7 is also designated for ULAs, but the specific range fc00::/8 is reserved for future use, while fd00::/8 is currently defined for ULAs.