In DHCP, what letter is used when searching for MAC addresses on Layer 2?

In the context of DHCP (Dynamic Host Configuration Protocol), when searching for MAC addresses on Layer 2, the correct letter used is "F." This is related to the use of the broadcast MAC address in the DHCP process.

When a DHCP client needs to obtain an IP address, it sends a DHCP Discover message. Since the client does not yet have an IP address, it uses the broadcast MAC address, which is represented as FF:FF:FF:FF:FF:FF in hexadecimal format. This address is used to ensure that all devices on the local LAN segment can receive the broadcast packet, allowing the DHCP server to respond to the client. The use of a broadcast address at Layer 2 is essential for the initial communication between the DHCP client and server, as the client is seeking to discover available DHCP servers on its network.

The other letters do not correspond to the standard representation of MAC addresses or the DHCP discovery process in this context. Thus, the choice of “F” is correct as it signifies the broadcast address necessary for Layer 2 communication in DHCP operations.