FeC0::9C5A is a valid IPv6 address of which type?

• A. Site-Local
• B. Global Unicast
• C. Link-Local
• D. Multicast

Answer: (A)

The question tests your ability to identify IPv6 address types from their prefixes. The address begins with fec0, which falls into the fec0::/10 range designated for site-local addresses. That means it’s a site-local IPv6 address, intended for internal use within a single organization’s site.

For contrast, link-local addresses start with fe80::/10 (used for automatic addressing and neighbor discovery on a single link), global unicast addresses start with 2000::/3 (the broad range for routable Internet-facing addresses), and multicast addresses start with ff00::/8 (for one-to-many delivery).

Note that site-local addresses are deprecated in modern practice in favor of Unique Local Addresses (fc00::/7), but the fec0::/10 prefix is the old marker for site-local, which is why this address is classified as such.