Qtech QSW-2800v2 Руководство пользователя онлайн [98/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [98/230] 481607
Chapter4 Router Configuration
3-4
According to the different requirements of Client, DHCP provides three types of IP
address distribution policy. Administrator can choose DHCP to use which policy to
response to every network or each host.
Distribute Address Manually: statically bind fixed IP address by administrator for a
few of specified Clients (such as WWW Server). DHCP sends the configured and
fixed IP address to Client.
Distribute Address Automatically: DHCP distributes the IP address with infinite
lease for Client.
Distribute Address Dynamically: DHCP distributes the IP address with
period of validity for Client. Reaching the period of validity, Client needs to apply
for address again.
DHCP expands the BOOTP from the following two aspects.
DHCP allows computer to obtain IP address fast and dynamically. In order to use
the DHCP dynamic address distribution mechanism, administrator must configure
DHCP Server and make DHCP Server offer a group of IP addresses called
address pool. Once new computer connects with network in any time, this
computer will communicate with Server and apply for an IP address. Server
chooses an address from the configured address pool and distributes it to this
computer.
Compared with BOOTP, DHCP can provide more abundant network configuration
information for Client.
DHCP has the following disadvantages.
When there are multiple DHCP Servers in the network, one DHCP Server cannot
find out the IP address which has been leased by other Server.
DHCP Server cannot communicate with Client in different network segment
unless the message is forwarded by DHCP Relay.
Only after enabling DHCP Relay, DHCP Option82 function can take effective.
Attention:

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