O'Reilly logo

CCNA Certification All-In-One For Dummies by Silviu Angelescu

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 4: Introducing Virtual Private Networks (VPNs)

Exam Objectives

Understanding Virtual Private Networks

Identifying VPN types

Understanding VPN implementation methods

Creating Virtual Private Networks using Cisco SDM

Examining SDM quality of service features

Reviewing VPN Management

Mobile users and telecommuters today make up an increasingly larger part of the corporate workforce. To provide corporate intranet resources to mobile employees, organizations are requiring more flexible, elaborate, and wider connectivity options. At the same time, companies attempt to remain cost conscious, eliminating any unnecessary and wasteful forms of communications. This balancing act between flexibility and cost has turned corporate attention away from expensive leased lines and Frame Relay circuits to more cost-effective and dynamic alternatives.

Rather than implementing dedicated lines that prove to be a huge financial burden, Virtual Private Networks (VPNs) provide companies with a secure connectivity solution between corporate sites. A VPN is a private network established using a public network infrastructure, such as the Internet. Remote users may access corporate LAN resources by connecting directly to local ISPs, thereby reducing long-distance telephone charges. By dismissing cost-intensive and highly inflexible communications methods for cheaper, more robust, and manageable solutions, the need for VPNs soon becomes very clear.

Purpose of VPNs

The main purpose of Virtual Private ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required