What is redirected by Redirect messages in IPv6 Neighbor Discovery?

• A. Inform hosts of a better first-hop router.
• B. Convey next-hop alternatives for routing.
• C. Notify the host about a change in destination address.
• D. Suggest a different MTU size.

Answer: (A)

Redirect messages in IPv6 Neighbor Discovery are sent by a router on the local link to tell a host that there is a better first-hop router to reach a specific destination. This helps the host optimize its on-link routing by updating the default route so that future packets for that destination go to the indicated router instead of the one currently used. It’s a targeted guidance for a particular destination on the local network, not a general spread of next-hop options, nor a notification about a destination address change or a different MTU. This is why the correct interpretation is that hosts are informed of a better first-hop router.