Which IPv6 address block forwards packets to a multicast address rather than a unicast address?
The correct answer is D. FF00::/12.
IPv6 multicast addresses are used to send packets to a group of devices that have joined a specific multicast group. A multicast address is identified by a prefix that starts with "FF" followed by the group ID.
In IPv6, the multicast address range is defined by the prefix FF00::/8. The first 8 bits (FF) indicate that the address is a multicast address, and the next 4 bits define the scope of the multicast group. The remaining bits represent the group ID.
Therefore, the correct answer is D. FF00::/12 because it is a more specific range of multicast addresses within the larger range of the multicast address prefix FF00::/8.
Option A. 2000::/3 is the prefix used for Global Unicast addresses, which are assigned to unique devices and used for unicast communication.
Option B. FC00::/7 is the prefix used for Unique Local Unicast addresses, which are used for local communication within a private network.
Option C. FE80::/10 is the prefix used for Link-Local Unicast addresses, which are used for communication within a single link or network segment.