Hello:
Extracted from this link:
proxy server
http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci212840,00.html
"In an enterprise that uses the Internet, a proxy server is a server
that acts as an intermediary between a workstation user and the
Internet so that the enterprise can ensure security, administrative
control, and caching service. A proxy server is associated with or
part of a gateway server that separates the enterprise network from
the outside network and a firewall server that protects the enterprise
network from outside intrusion."
"A proxy server receives a request for an Internet service (such as a
Web page request) from a user. If it passes filtering requirements,
the proxy server, assuming it is also a cache server, looks in its
local cache of previously downloaded Web pages. If it finds the page,
it returns it to the user without needing to forward the request to
the Internet. If the page is not in the cache, the proxy server,
acting as a client on behalf of the user, uses one of its own IP
addresses to request the page from the server out on the Internet.
When the page is returned, the proxy server relates it to the original
request and forwards it on to the user."
"To the user, the proxy server is invisible; all Internet requests and
returned responses appear to be directly with the addressed Internet
server. (The proxy is not quite invisible; its IP address has to be
specified as a configuration option to the browser or other protocol
program.)"
"An advantage of a proxy server is that its cache can serve all users.
If one or more Internet sites are frequently requested, these are
likely to be in the proxy's cache, which will improve user response
time. In fact, there are special servers called cache servers. A proxy
can also do logging."
"The functions of proxy, firewall, and caching can be in separate
server programs or combined in a single package. Different server
programs can be in different computers. For example, a proxy server
may in the same machine with a firewall server or it may be on a
separate server and forward requests through the firewall."
And the purpose to install a proxy server on a company could be:
-Speed up internet access
-Reduce bandwidth usage
-Improve company's security
-Restrict internet access by blocking some sites or prevent internet
access at some times
-Track employees activity on internet
-etc
Don't hesitate to request for any clarification.
Search strategy
proxy definition
://www.google.com/search?hl=es&ie=UTF-8&oe=UTF-8&q=proxy+definition&lr=
Regards |
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