Networking - TCP/IP - Discussion

Discussion :: TCP/IP - TCP/IP (Q.No.3)

3. 

Which of the following describe the DHCP Discover message?

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

[A]. 1 only
[B]. 1 and 2
[C]. 3 and 4
[D]. 4 only

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.

Teddy said: (Jul 27, 2015)  
What is layer 2 and 3 broadcast?

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