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- <div id="kms-document-div"><h1>What is a proxy server? </h1>
- <p>A proxy server, also known as a "proxy" or "application-level
- gateway", is a computer that acts as a gateway between a local network
- (e.g., all the computers at one company or in one building) and a
- larger-scale network such as the <span>Internet</span>. Proxy servers
- provide increased performance and security. In some cases,
- they monitor employees' use of outside resources.</p>
- <p>A proxy server works by intercepting connections between sender
- and receiver. All incoming data enters through one port and is
- forwarded to the rest of the network via another port. By blocking
- direct access between two networks, proxy servers make it much more
- difficult for <span>hackers</span> to get internal addresses and details
- of a private network.</p>
- <p>Some proxy servers are a group of applications or servers that block
- common Internet services. For example, an <span>HTTP</span>
- proxy intercepts web access, and an <span>SMTP</span> proxy intercepts
- email. A proxy server uses a network addressing scheme to present
- one organization-wide <span>IP address</span> to the Internet. The
- server funnels all user requests to the Internet and returns responses
- to the appropriate users. In addition to restricting access from
- outside, this mechanism can prevent inside users from reaching
- specific Internet resources (e.g., certain websites). A proxy server
- can also be one of the components of a <a class="kbh" href="aoru" title="">firewall</a>.</p>
- <p>Proxies may also cache web pages. Each time an internal user requests
- a <span>URL</span> from outside, a temporary copy is stored locally. The
- next time an internal user requests the same URL, the proxy can serve
- the local copy instead of retrieving the original across the network,
- improving performance.</p>
- <p><strong>Note:</strong> Do not confuse a proxy server with a
- <span>NAT</span> (Network Address Translation) device. A proxy server
- connects to, responds to, and receives traffic from the Internet,
- acting on behalf of the client computer, while a NAT device
- transparently changes the origination address of traffic coming
- through it before passing it to the Internet.
- </p>
- <p>For those who understand the OSI (Open System Interconnection) model
- of networking, the technical difference between a proxy and a NAT is
- that the proxy server works on the transport layer (layer 4) or higher
- of the OSI model, whereas a NAT works on the network layer (layer 3).</p>
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- <em>This is document</em> <span>ahoo</span> <em>in the Knowledge Base.</em>
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- <em>Last modified on</em> <span>2015-03-12 00:00:00</span><em>.</em>
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