Suppose in DHCP server running network(assigning ip
addresses automatically), you connect a Laptop in the same
n/w, now how the DHCP is going to assign a IP add. to it and
how it will came to know that there's one new machine added.

Answer Posted / murali

when a pc/client is connected to the network. it send a
message DHCPDISCOVER. So its the client resp to find the
DHCP server
now the server send back a reply by offering a ip address
say DCHPOFFER.. then client ack for specific IP address in
case if it wants ip from a particular scope DHCPREQUEST..if
the request is accepted by server it send message dhcpack.

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