Which of the following transmission methods do DHCP enabled devices use to request an IP address?

The correct answer is A. Broadcast. When a DHCP-enabled device starts up without an IP address, it sends a DHCPDISCOVER message as a broadcast (destination IP 255.255.255.255, destination MAC FF:FF:FF:FF:FF:FF) because it does not yet know the address of the DHCP server. This broadcast reaches all devices on the…

Networking concepts

Question

Options

ABroadcast
BDirected broadcast
CUnicast
DMulticast

How the community answered

(55 responses)

A
93% (51)
B
2% (1)
C
2% (1)
D
4% (2)

Explanation

When a DHCP-enabled device starts up without an IP address, it sends a DHCPDISCOVER message as a broadcast (destination IP 255.255.255.255, destination MAC FF:FF:FF:FF:FF:FF) because it does not yet know the address of the DHCP server. This broadcast reaches all devices on the local subnet, and any DHCP server responds with a DHCPOFFER. Unicast requires a known destination address, multicast targets a specific group, and directed broadcast targets a specific network - none are appropriate before an IP address is assigned.

Topics

#DHCP#broadcast#IP addressing

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