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 "A tunneling protocol is a network protocol which encapsulates one protocol or session inside another. Protocol A is encapsulated 
within protocol B, such that A treats B as though it were a data link layer. Tunneling may be used to transport a network protocol 
through a network which would not otherwise support it. Tunnelling may also be used to provide various types of VPN functionality 
such as private addressing."

e.g. : a transit network unsupporting a specific protocol (DECnet), the need to provide confidentiality and integrity for a specific network stream…

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