21DA:D3:0:2F:3B:2AA:FF:FE:28:9C 5A is a valid IPV6 unicast address.

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Multiple Choice

21DA:D3:0:2F:3B:2AA:FF:FE:28:9C 5A is a valid IPV6 unicast address.

Explanation:
A global unicast IPv6 address is indicated by its prefix, which starts in the range 2000::/3. This address begins with 21DA, and the first bits show it falls inside the 2000–3fff space, so it is globally routable. It is not a multicast address (those begin with FF) and not a link-local address (those begin with FE80). The presence of FF:FE in the middle of the address is common when an interface ID is formed from a MAC using the EUI-64 method, so that portion doesn’t make the address invalid. As long as the representation uses valid hex groups separated by colons and fits the IPv6 format, it is considered a valid IPv6 unicast address.

A global unicast IPv6 address is indicated by its prefix, which starts in the range 2000::/3. This address begins with 21DA, and the first bits show it falls inside the 2000–3fff space, so it is globally routable. It is not a multicast address (those begin with FF) and not a link-local address (those begin with FE80). The presence of FF:FE in the middle of the address is common when an interface ID is formed from a MAC using the EUI-64 method, so that portion doesn’t make the address invalid. As long as the representation uses valid hex groups separated by colons and fits the IPv6 format, it is considered a valid IPv6 unicast address.

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