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Answer Posted / rajiv dikshit
In computer networking, DMZ is a firewall configuration for
securing local area networks (LANs).
In a DMZ configuration, most computers on the LAN run
behind a firewall connected to a public network like the
Internet. One or more computers also run outside the
firewall, in the DMZ. Those computers on the outside
intercept traffic and broker requests for the rest of the
LAN, adding an extra layer of protection for computers
behind the firewall.
Traditional DMZs allow computers behind the firewall to
initiate requests outbound to the DMZ. Computers in the DMZ
in turn respond, forward or re-issue requests out to the
Internet or other public network, as proxy servers do.
(Many DMZ implementations, in fact, simply utilize a proxy
server or servers as the computers within the DMZ.) The LAN
firewall, though, prevents computers in the DMZ from
initiating inbound requests.
DMZ is a commonly-touted feature of home broadband routers.
However, in most instances these features are not true
DMZs. Broadband routers often implement a DMZ simply
through additional firewall rules, meaning that incoming
requests reach the firewall directly. In a true DMZ,
incoming requests must first pass through a DMZ computer
before reaching the firewall.
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