An architecture which enables the point-to-point transmission of electronic data in a format different from the format in which it originated and was ultimately received. Tunneling can be used to send non-IP protocols (e.g. IPX, AppleTalk) over an IP network such as the Internet. It can also be used to transmit unencrypted data over the transmission media in encrypted format without requiring encryption by the host or application at either end. The Point-to-Point Tunneling Protocol encapsulates the Point-to-Point Protocol for control purposes. (See IP, Internet, encryption, host, application, Point-to-Point Protocol, and encapsulation in the hard copy dictionary.)

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