| 1.4 |  | Security Products and Solutions |
| 1.4.4 |  | Virtual Private Networks |

| The broadest definition of a Virtual Private Network (VPN) is any network built upon a public network and partitioned for use by individual users. As a result, public Frame Relay, X.25, and ATM networks are considered VPNs. These types of VPNs are generically referred to as Layer 2 VPNs. The emerging form of VPNs consists of networks constructed across shared IP backbones, referred to as IP VPNs, which focus on Layer 3.

IP VPNs are not simply encrypted tunnels. IP VPNs, encompass an entire spectrum of technologies and supporting products including firewalls, encryption, AAA, intrusion detection, tunneling, QoS, and network management . There are fundamentally two different corporate or business uses of VPNs:

- Remote-access VPNs
- Site-to-site extranet and intranet VPNs

VPN devices
VPNs can be created using many products including firewalls, routers, VPN concentrators, VPN software and hardware clients, intrusion detection devices, and management software . Figure illustrates some of the major devices available through Cisco Systems. Other VPN vendors include Netscreen, Check Point, and Nortel.

This course will help students design, install, and configure VPNs using routers, firewalls, and VPN clients to create site to site and remote access VPNs , .

The Cisco VPN 3000 Concentrator Series mentioned above is a family of purpose-built, remote-access VPN platforms and client software, which support various enterprise customers . Customers range from small businesses with 100 or fewer remote-access users to large organizations with up to 10,000 simultaneous remote users. This course will not cover the 3000 Concentrator series.

| Web Links Security and VPN http://www.cisco.com/en/US/netsol/ ns110/ns170/net_solution_home.html