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NAT is abbreviated from Net Address Translation; it's a protocol responsible for IP address translation.
In other word, it is responsible for transforming IP and port of private network to public, also is the IP
address mapping which we usually say.
DMZ
In order to make some intranet equipments support better service for extranet, and make internal
network security more effectively, these equipments open to extranet need be separated from the other
equipments not open to extranet by the corresponding isolation method according to different demands.
We can provide the different security level protection in terms of the different resources by building a
DMZ region which can provide the network level protection for the equipments environment, reduce the
risk which is caused by providing service to distrust customer, and is the best position to put public
information .
The following chart describes the network access control of DMZ:
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