What is the broadcast address that consists entirely of 'F's?

The broadcast address that consists entirely of 'F's refers specifically to the Ethernet broadcast address, which is represented in hexadecimal as FF:FF:FF:FF:FF:FF. In networking, this address is used to send packets to all devices on a local network segment.

When a device sends a packet to this address, it effectively reaches every device connected to the same local area network (LAN), as the packet's destination is recognized by all devices. This is crucial in scenarios where a message needs to be disseminated to all nodes, such as in address resolution protocol (ARP) requests or network discovery activities.

Other address types mentioned, such as direct addresses, universal addresses, and segment addresses, do not specifically refer to this broadcast mechanism or the hexadecimal value of all 'F's. Therefore, the Ethernet broadcast address is the correct and relevant choice for this question, as it directly pertains to the concept of broadcasting messages to all devices on a local network.