DHCP (Dynamic Host Configuration Protocol)
It dynamically assigns IP address to the systems which r 
connected in LAN.DHCP server assigs the Ip addresses.
The procedure is as follows.
vn ever a system(c1)is switched on,it broadcast a packet 
and this packet consists of its MAC address.vn this packet 
reaches DHCP server,it cheks the MAC address table list 
available with it.If MAC address of c1 matches with the 
address table list it assigns any one IP address based upon 
the scope given in DHCP SERVER.
Eg.scope of DHCP SERVER 192.168.1.1 to 192.168.1.254