Which address block identifies all link-local addresses?
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A. B. C. D.C
The correct answer is C. FE80::/10.
IPv6 link-local addresses are used to communicate within a single subnet and are not routable. These addresses are automatically generated by the host and do not require any manual configuration. The first 10 bits of the IPv6 address identify it as a link-local address.
The FE80::/10 address block is reserved for link-local addresses in IPv6. This means that any address that starts with FE80 will be a link-local address. The /10 prefix length indicates that the first 10 bits of the address are fixed and identify the address as a link-local address. The remaining 118 bits can be used for unique interface identifiers.
The other answer options are:
A. FC00::/7: This is the unique local address (ULA) address block, used for private addresses within an organization. It is not used for link-local addresses.
B. FC00::/8: This is a part of the ULA address block and is not used for link-local addresses.
D. FF00::/8: This is the multicast address block and is not used for link-local addresses.