DHCP overview

The Dynamic Host Configuration Protocol (DHCP) dynamically configures and uniformly manages network parameters of hosts on a TCP/IP network. DHCP supports both dynamic and static IP address allocation:
- Dynamic IP address allocation: allocates an IP address with a validity period (lease) to a client.
This mechanism applies to hosts that temporarily connect to a network with fewer IP addresses than the total number of hosts. For example, this mechanism can be used to allocate IP addresses to laptops used by employees on business trips or mobile terminals in cafes.
- Static IP address allocation: allocates fixed IP addresses to specified clients.
This mechanism applies to hosts with special IP address requirements, for example, the file server of an enterprise that needs to use a fixed IP address to provide services for extranet users.
Compared with manual IP address configuration, DHCP static allocation prevents manual configuration errors and helps network administrators in unified maintenance and management.
In addition to IP addresses, DHCP can also allocate other network parameters to hosts, including the DNS server address, routing information, and gateway address.

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