Which of the following traffic types uses Class D IP address space?

Class D IPv4 address space is used for multicast traffic. The multicast IPv4 range is 224.0.0.0 through 239.255.255.255. Multicast is a one-to-many communication method in which a source sends traffic to a multicast group, and only devices that have joined that group receive the traffic. This is more efficient than broadcast because the traffic is not sent to every host on the network. It is also different from unicast, which is one-to-one communication between a single source and a single destination.

The CompTIA Network+ N10-009 objectives include understanding IPv4 addressing, traffic types, and network communication methods such as unicast, broadcast, multicast, and anycast. Multicast is commonly used for streaming media, routing protocol updates, conferencing systems, and other services where the same data must be delivered to multiple interested receivers.

Anycast allows multiple systems to share the same address, with routing directing users to the nearest or best destination. Broadcast sends traffic to all hosts in a broadcast domain. Unicast sends traffic to one specific host. Since Class D is reserved for multicast, option A is correct.