Which from the following is NOT a method used by IPv6 for neighbor and router discovery?

The correct answer highlights that "website-based routing" is not a method used by IPv6 for neighbor and router discovery. In IPv6, neighbor discovery and router discovery are crucial processes that allow devices on the same link to discover each other and learn about routers in the network.

IPv6 employs several methods for these processes, such as:

• Link-local addresses, which are used for communication within a single network segment and facilitate neighbor discovery.

• Anycast addresses, which allow packets to be sent to the nearest interface among a group of potential receivers, and they can be part of routing to determine the nearest router.

• Multicast addresses are used to send messages to multiple devices simultaneously, which is essential during the router solicitation and neighbor advertisement processes.

In contrast, "website-based routing" does not pertain to or function within the context of IPv6 networking protocols. It does not contribute to the processes of neighbor discovery or routing within a network. Therefore, this choice is correctly identified as not being a method used in the essential workings of IPv6 communication.