Which of the following are valid IPv6 addresses? Select all that apply.

a. fe80::64d2:bd2e:fa62:b911

b. fe80::g90p:bd2e:fa62:b911

c. fe80::64d2:bd2e::b911

d. : :1

fe80::64d2:bd2e:fa62:b911, and : :1 are valid IPv6 addresses from the given options.

Explanation:

fe80::64d2:bd2e:fa62:b911 is a valid IPv6 address as it has correct number of blocks, that is separated by :, and a : : multicast group that fills the blocks with 0's. fe80::g90p:bd2e:fa62:b911 is not a valid IPv6 address because IPv6 address allows only hexadecimal values that is from 0-9 and a to f. Here it contains value g and p. Hence invalid. fe80::64d2:bd2e::b911 is not valid because two multicast group "::" is not allowed in IPv6 address. : :1 is a valid IPv6 address, here "::" is filled by 0's and it is used as a destination address and not as a source address.