Final answer:
Link-local and site-local IPv6 addresses begin with prefixes FE80 and FEC0, respectively. Site-local addresses are deprecated and replaced by Unique Local Addresses with the FC00::/7 prefix.
Step-by-step explanation:
The question addresses a topic in computer networking, specifically related to IPv6 addresses. Link-local and site-local addresses begin with the prefixes FE80 and FEC0, respectively. Link-local addresses are used for communication within the same network segment, while site-local addresses were originally intended for addressing within a site without the need for a global prefix, but they are now deprecated in favor of Unique Local Addresses (ULAs). It's important to note that the use of the FEC0 prefix for site-local addresses has been deprecated; new networks should use ULAs with the FC00::/7 prefix. Nonetheless, understanding these prefixes can be helpful when studying legacy IPv6 networks.