ipv6 address

[jonk34567]

Which  statements about IPv6 address fd14:920b:f83d:4079::/64 are true?
A. The subnet ID is 14920bf83d
B. The subnet ID is 4079
C. The global ID is 14920bf83d
D. The address is a link-local address
E. The global ID is 4079
F. The address is a unique local address

[Harold Ritter]

B, C and F.

Regards,

[jonk34567]

i can understand B and F. but can you pls explain the "C ". first 2 bits fd  were not included in the global id.why ? 

[Harold Ritter]

It is actually the first 8 bits that are not included in the global id. Please refer to section 3.1 of RFC4193 for the full format of the unique local address.

https://tools.ietf.org/html/rfc4193#section-3.1

Regards,