CCNA (TCP/IP Question 3 )

Which of the following describe the DHCP Discover message?

• It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.
• It uses UDP as the Transport layer protocol.
• It uses TCP as the Transport layer protocol.
• It does not use a layer 2 destination address.

A. 1 only

B. 1 and 2

C. 3 and 4

D. 4 only



Answer & Explanation
Answer: Option B

Explanation:

A client that sends out a DHCP Discover message in order to receive an IP address sends out a broadcast at both layer 2 and layer 3. The layer 2 broadcast is all Fs in hex, or FF:FF:FF:FF:FF:FF. The layer 3 broadcast is 255.255.255.255, which means all networks and all hosts. DHCP is connectionless, which means it uses User Datagram Protocol (UDP) at the Transport layer, also called the Host-to-Host layer.

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