How do IPv6 link-local and unique local addresses differ in scope?
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Correct answer: Link-local addresses are limited to the directly attached link; unique local addresses are used across an organization or site..
Why this is the answer
IPv6 link-local addresses (fe80::/10) are automatically configured on all interfaces and are strictly confined to a single local link. They are used for neighbor discovery, stateless address autoconfiguration (SLAAC), and other on-link communication. They are not routable beyond the local segment. Unique local addresses (ULA) (fc00::/7) are routable within a private network or site, similar to IPv4 private addresses (e.g., 10.0.0.0/8). They are designed for communication within an organization and are not intended to be routed on the global internet. The other options incorrectly describe the scope of these address types. Link-local addresses do not have global scope, nor are they limited to a loopback. Unique local addresses are not limited to a loopback.
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