To perform DAD, which address does a device send an NS to?

In the context of IPv6, Duplicate Address Detection (DAD) is a process used to ensure that an address proposed for use on a network is not already in use by another device. To perform DAD, a device sends a Neighbor Solicitation (NS) message specifically to its own solicited-node multicast address.

The solicited-node multicast address is a special type of multicast address that includes the last 24 bits of an IPv6 address. By sending the NS message to this address, the device can efficiently check for the presence of any other device on the network that might be using the same address. This makes the process of DAD more efficient, as it limits the multicast request to only those devices that are likely to have the same address, rather than broadcasting to the entire network.

This targeted approach helps reduce network traffic and ensures a timely response to the address resolution query. Thus, the correct choice reflects the specific mechanism used in IPv6 DAD to verify the uniqueness of an address on the local link.