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VPN protocol that operates at layer 3 of an OSI network model is:
PPTP
L2TP
PPP
IPSec
Stewart , James M.; Chapple, Mike; Gibson, Darril. CISSP (ISC)2 Certified Information Systems Security Professional Official Study Guide (Kindle Locations 14031-14032). Wiley. Kindle Edition. --------- PPP is another Layer 2 protocol but is mostly associated with dial-up connections.
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