DHCP allows an IP address to be assigned to a computer without requiring the administrator to configure information about the computer in the server data. The function of DHCP is to assign an IP to the PC. In a LAN, if your router has this function, it will remember the MC address of the PC, and then assign an IP address to the PC. Then the PC with this MC address will use this IP address to access the Internet in the future. The function is It can prevent external PCs from accessing the Internet and avoid errors caused by repeated use of IP addresses.

What does DHCP mean? DHCP definition:

DHCP (Dynamic Host Configuration Protocol) is a LAN network protocol that uses UDP protocol. It has two main uses: automatically assigning IP addresses to internal networks or network service providers, and assigning IP addresses to users or internal network administrators. As a means of central management of all computers. DHCP has 3 ports, of which UDP67 and UDP68 are normal DHCP service ports, serving as the service ports of DHCP Server and DHCP Client respectively; port 546 is used for DHCPv6 Client, not for DHCPv4, and serves DHCP failover, which is required A specially enabled service, DHCP failover is used for "dual-machine hot backup".

What does DHCP mean? Functions of DHCP:

DHCP (Dynamic Host Configuration Protocol) is usually used in large-scale local area network environments. Its main function is to centrally manage and allocate IP addresses, so that hosts in the network environment can dynamically obtain IP addresses, Gateway addresses, and DNS. Server address and other information, and can improve the usage of the address.

The DHCP protocol uses a client/server model, and the dynamic allocation of host addresses is driven by the network host. When the DHCP server receives the information from the network host applying for an address, it will send relevant address configuration and other information to the network host to achieve dynamic configuration of the network host address information. DHCP has the following functions:

1. Ensure that any IP address can only be used by one DHCP client at the same time.

2. DHCP should be able to assign permanent fixed IP addresses to users.

3. DHCP should be able to coexist with hosts that use other methods to obtain IP addresses (such as hosts with manually configured IP addresses).

4. The DHCP server should provide services to existing BOOTP clients.

DHCP has three mechanisms to assign IP addresses:

1) Automatic Allocation: The DHCP server assigns a permanent IP address to the host. Once the DHCP client successfully leases an IP address from the DHCP server for the first time, it can use the address permanently.

2) Dynamic Allocation: The DHCP server assigns a time-limited IP address to the host. When the time expires or the host explicitly gives up the address, the address can be used by other hosts.

3) Manual Allocation: The client's IP address is specified by the network administrator, and the DHCP server only tells the client host the specified IP address.

Of the three address allocation methods, only dynamic allocation can reuse addresses that are no longer needed by the client.

The above is a brief introduction to what DHCP means. I hope it will be helpful to everyone.