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NTRODUCTION
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1-4
Point-to-Point Tunneling Protocol — Provides a secure tunnel
for remote client access to a PPTP security gateway. PPTP
includes provisions for call origination and flow control required
by ISPs.
L2TP merges the best features of PPTP and L2F — Like PPTP,
L2TP requires that the ISP's routers support the protocol.
IP Security — Provides IP network-layer encryption. IPSec can
support large encryption networks (such as the Internet) by using
digital certificates for device authentication.