Download Presentation-Proxy Server

PROXY SERVER
Kalyani Ravi

A proxy server is essentially an electronic
gatekeeper, residing between an organization's
internal network and the Internet, controlling the
flow of information between the two.
 The three basic functions of a proxy server are:
IP-Masking
Data Caching
Access Control
IP-Masking

IP-address masking is a technique whereby a proxy server
tricks other computer on the Internet into thinking that it is
the only machine receiving or requesting information from
an institution .
Proxy server acts like middle man between an
internal network and the internet, all requests for
information are channeled through the proxy server which
places the requests on behalf of user computers. Therefore
proxy servers is only seen by other computers on the
internet and masks the IP address of the internal computer
networks.

As everything from or to internal network passes
through proxy server it increases network security
and user productivity by filtering content.
Proxy servers limits access to objectionable
content like viruses and HTML tags at the internet
gateway by filtering URLs.
proxy servers restrict unauthorized access to
the internal network by authenticating users
Proxy Caching

Proxy Server caches frequently accessed documents
automatically and requests data from its source only
when that source has been updated or has expired,
which reduces network traffic and gives users access
to fresh content without the wait. Documents or entire
sites can be preloaded into the cache, and
administrators can schedule updates of cached
content. Whole sites can be downloaded during lowtraffic periods, for example, so they're fresh when
users need them. Thereby reducing network traffic
on intranet and improve response time for users.
Access Control

a proxy server provides institutions with an
effective tool to provide access to remote users.
An off-site (or off-campus) user connects to
the Internet via an ISP and wants to connect to an
IP-restricted resource. If the user were to connect
to the resource directly, they would be denied
access because their IP-address didn't match that
of the subscribing institution. However, if the user
were to connect to the institution's proxy server
and validate themselves, the proxy server would
then handle the flow of information between the
user and the resource provider (masking the user's
IP-address). As a result, the resource would see the
proxy server's IP-address as valid and provide
access