1. Chapter 10 Virtual Private Networks

2. VPN Defined  A segment of the public network made to appear part of a private network so that it can be used to carry private traffic securely  Constructed by connecting two or more private networks using a tunnel

3. Types of VPNs  May be encrypted (IPsec) or nonencrypted (GRE)  May be formed using Frame Relay or ATM  Network layer VPNs include IPsec, GRE, and L2TP  Application layer VPNs include SSL and SSH  Intranet VPNs connect two or more private networks within the same organization  Extranet VPNs connect private networks belonging to more than one organization

4. Types of VPNs based on OSI Model Layers

5. Intranet and Extranet VPNs