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what is layer 2 tuning protocall(L2TP)??

what is layer 2 tuning protocall(L2TP)??

L2TP is  a tuning protocall which is used to support VPN(virtual private network). L2TP is often employed by ISPs to allow VPN operations.
It was devlop by two companies : -  Microsoft and Cisco and it was published in 1999. It was designed as a sort of successor to PPTP.

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