Tuesday, 7 August 2012

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


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, 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.


Post a Comment

Twitter Delicious Facebook Digg Stumbleupon Favorites More