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DHCP is Dynamic Host Configuration Protocol.
DHCP thus saves the administrator a lot of work and is specially useful in larger networks.
Installing free DHCP server is easy, it is the configuration that takes some time and thought.
First and foremost you gotta install a DHCP server on your gear.
Keep in mind that you might have to turn on the universe and mulitverse repositories.
(To do so, check the appropriate checkbox insideSystem > Administration > Software Sources).
Once installed you gotta get configuring.
Configuring the DHCP server requires editing configuration files and having a decent knowledge of networking won’t hurt either.
With a little configuration, the DHCP server is ready for work.
As an option you could also use Webmin to configure your DHCP server using a web internet tool.