FTP

File Transfer Protocol

IP

Internet Protocol

IKE

IPSec Key Exchange

ISAKMP

Internet Security Association and Key Management Protocol

ISP

Internet service provider

L2TP

Layer2 Tunneling Protocol

LDAP

Lightweight Directory Access Protocol

LAN

local area network

PDN

public data networks

POP

point-of-presence

PPP

Point-to-Point Protocol

PPTP

Point-to-Point Tunneling Protocol

UDP

User Datagram Protocol

VPN

virtual private network

WAN

wide area network