Final answer:
The multicast MAC address associated with an IPv4 multicast address begins with 01:00:5E.
Step-by-step explanation:
The multicast MAC address associated with an IPv4 multicast address is a special value that begins with 01:00:5E.
An IPv4 multicast address allows a single sender to reach multiple recipients. The multicast group address is mapped to a multicast MAC address by using a special algorithm.
For example, if we have an IPv4 multicast address of 224.1.2.3, the corresponding multicast MAC address would be 01:00:5E:01:02:03. The first 3 bytes (01:00:5E) are a reserved value for multicast MAC addresses, and the last 3 bytes (01:02:03) are derived from the last 3 bytes of the multicast IPv4 address.