| 14.1 |  | The PIX Security Appliance Enables a Secure VPN |
| 14.1.2 |  | PIX Security Appliance VPN topologies |

| With its numerous capabilities and conformity to IPSec standards, the PIX Security Appliance can operate in many network topologies:

- PIX Security Appliance to PIX Security Appliance is a secure VPN gateway where two or more PIX Security Appliances can enable a VPN that secures traffic from devices behind the PIX Security Appliances. The secure VPN gateway topology prevents the user from having to implement VPN devices or software inside the network, making the secure gateway transparent to users.
- PIX Security Appliance to Cisco IOS Router is a secure VPN gateway where the PIX Security Appliance and Cisco router running VPN licensed IOS, can interoperate to create a secure VPN gateway between networks in much the same way as a PIX Security Appliance to PIX VPN topology.
- Cisco VPN Client to PIX Security Appliance is a scenario where the PIX Security Appliance can become a VPN endpoint for a VPN Client over either a dialup network or an IP Network. This configuration allows telecommuters to access services that are available in the secured office network. The PIX Security Appliance supports client connections from the Cisco Unified VPN Client and the Microsoft native L2TP client.
- Other vendor products to PIX Security Appliance scenarios are possible if the vendor products conform to open VPN standards.