( = Layer 2 Tunneling Protocol,
"kihi 2 tunneldusprotokoll")

olemus
protokoll, mis tunneldab OSI mudeli lülikihis;
Microsofti ja Cisco väljatööde,
toetab virtuaalseid privaatvõrke IP-, ATM-, X.25-, FR-võrkudes
=
a protocol for tunneling Layer 2 traffic over a Layer 3 network, supports VPNs, using encryption only for its own control messages and not for content

ülevaateid
https://www.techopedia.com/definition/26196/layer-2-tunneling-protocol-l2tp

https://en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol

https://www.cisco.com/c/en/us/td/docs/net_mgmt/prime/network/3-8/reference/guide/l2tp.pdf

standardid
https://tools.ietf.org/html/rfc2661
https://tools.ietf.org/html/rfc3193