Discussion
Which protocol does DHCP use at the Transport layer?
Answer: C
Correct answer: UDP
DHCP runs over UDP, on port 67 for the server and 68 for the client. It must, because the client has no IP address when it begins: the initial DHCPDISCOVER is a broadcast from 0.0.0.0, and TCP cannot establish a connection without addresses at both ends. IP is a network layer protocol rather than a transport one, and ARP is a layer 2 resolution protocol.
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