Tunnelling

<networking> (US: "tunneling") Encapsulation of protocol A within protocol B, such that A treats B as though it were a data link layer.

Tunnelling is used to get data between administrative domains which use a protocol that is not supported by the internet connecting those domains.

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TUI Tukey, John Tuki tunafish tune	blow out Flash Erasable Programmable Read-Only Memory FN tunnelling Fowler-Nordheim tunnelling tunnelling	TUPLE tuple tuple calculus Tuple Space Smalltalk tupling