Figure 5-17 Network diagram of DHCP
For different DHCP clients, DHCP server provides three IP address assigning methods:
(1)Manually assign the IP address: Allows the administrator to bind the static IP address to a
specific client (e.g.: WWW Server) via the DHCP server.
(2)Automatically assign the IP address: DHCP server assigns the IP address without an expiry time limitation to the clients.
(3)Dynamically assign the IP address: DHCP server assigns the IP address with an expiry time. When the time for the IP address expired, the client should apply for a new one.
Most clients obtain IP addresses dynamically, which is illustrated in the following figure.
Figure 5-18 Interaction between a DHCP client and a DHCP server
(1)
(2)
(3)
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