Short for Layer Two Tunneling Protocol, an extension to the PPP protocol that enables the operation of Virtual Private Networks (VPNs). L2TP merges the best features of two other tunneling protocols: PPTP from Microsoft and L2F from Cisco Sysyems.
L2TP
Meaning of L2TP in English
DAX English glossary of key connectivity terms. Английский глоссарий основных терминов по коммуникациям DAX. 2012