IPV6 Feature Supported in IPV4 but Not Commonly Used

C

The correct answer is D. broadcast.

IPv4 uses broadcast addressing to send packets to all nodes on a network segment. A broadcast packet has a destination IP address of 255.255.255.255. Broadcast is used to deliver packets to all nodes on a network segment, regardless of whether or not they are interested in receiving the packets. This can be useful in certain situations, such as when sending an ARP request to resolve a MAC address.

In contrast, IPv6 does not use broadcast addressing. Instead, it uses multicast addressing to send packets to a specific group of nodes. Multicast packets have a destination IP address in the range ff00::/8, and only nodes that have joined the multicast group will receive the packets.

While unicast, multicast, and anycast are all features of both IPv4 and IPv6, broadcast is supported in IPv4 but not commonly used in practice. This is because broadcast can cause unnecessary traffic on the network and can also pose security risks, such as allowing an attacker to send a broadcast packet to all nodes on the network segment. As a result, most modern network protocols, including IPv6, have moved away from using broadcast in favor of more efficient and secure mechanisms like multicast and anycast.