How does SLAAC work in IPv6?

• A. Hosts generate IPv6 addresses using router advertisements and their own interface identifiers (often EUI-64 or random), allowing autoconfiguration.
• B. DHCPv6 assigns addresses exclusively; no autoconfiguration.
• C. RA in IPv6 is used for DNS resolution.
• D. SLAAC requires manual configuration of addresses.

Answer: (A)

SLAAC lets a host configure itself an IPv6 address using information from the router rather than manual setup. Routers send Router Advertisements that include a network prefix and an autonomous address-configuration flag. When a host receives this, it builds a global address by combining the advertised prefix with its own interface identifier (derived from the MAC as EUI-64 or from a random value for privacy). It then runs Duplicate Address Detection to ensure the address is unique on the link. If all is well, the host uses that address and also learns the default route from the router’s information in the advertisement. DNS or other settings aren’t provided by SLAAC itself; those can come from other mechanisms such as DHCPv6 or manual configuration, but SLAAC primarily handles the automatic address configuration. This approach is why the described option is correct: it captures how the host uses the router’s prefix and its own interface ID to autoconfigure addresses, enabling automatic IPv6 setup without manual steps.