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IPSEC

Internet Protocol Security. The IPSEC protocol encapsulates one data packet entirely inside another in order to carry it across a transit network. IPSEC is one protocol used to create a VPN - the complete encapsulation (and usually encryption) by IPSEC is similar to the envelope used to send a letter. The letter is intact from sender to recipient however the envelope get read and passed between sorting offices.

More Information:http://en.wikipedia.org/wiki/IPSEC
 

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IPSEC