Virtual Private Networks
Many organizations deploy virtual private networks (VPN) to provide data integrity, authentication, and data encryption to ensure confidentiality of the packets sent over an unprotected network or the Internet. VPNs are designed to avoid the cost of unnecessary leased lines. Many different protocols are used for VPN implementations, including the following:
Point-to-Point Tunneling Protocol (PPTP)
Layer 2 Forwarding (L2F) Protocol
Layer 2 Tunneling Protocol (L2TP)
Generic routing encapsulation (GRE)
Multiprotocol Label ...
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