IP Security Protocol (IPSec) defines a set of protocols and cryptographic algorithms for creating secure IP traffic sessions between IPSec gateways. Enterprises can no longer keep pace with ever changing technology; legacy networks such as ATM and Frame Relay are examples of such technologies that are not able to keep up with the technological advances. Flexibility, scalability, global reach, and security are critical network components that help to define an enterprise's success. IPSec Virtual Private Networks (VPNs) allow enterprises to leverage the speed, ubiquity, and flexibility of the Internet, while gaining security beyond that which is Provided by legacy network technologies. There have been many improvements in the internet including quality of service, network performance and inexpensive technologies such as DSL. But, one of the most important advances has been in security.
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