It 'a protocol that allows the automatic configuration of IPaddresses. It is contained in UDP packets and has assignedthe default port 67. DHCP servers provide TCP / IP addresses valid for the client, divided into groups andhave a TTL. Clients receive an IP address to connect and some other optional parameters. 

There are different types of assignment:
- Manual: The operator defines explicit mapping between the host and IP. The address is permanently assigned once
- Automatic: The server automatically assigns IP but is careful to give back to the same host on the same IP foreach connection
- Dynamic: The server assigns IPs in a range temporarilylognica FCFS. For each disconnection addresses "free" are reassigned.