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DHCP is really important. It's responsible for the automatic assignment of IP addresses in your network.

It does all of the things.

Below is the configuration for DHCP in Cisco's IOS.

R1#sh run | s dhcp
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.0.1 192.168.0.49
ip dhcp pool MYNETWORK
   network 192.168.0.0 255.255.255.0
   default-router 192.168.0.1 
R1#