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Cisco Networking Simplified by Jim Doherty, Paul Della Maggiora

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Chapter . VPNs

Secure Networking Over the Internet

Traditional WAN networking involved dedicated circuits running Frame Relay or leased lines. Although prices have recently decreased, the cost of these private circuits continues to be high.

In addition to dedicated WAN connections, corporations had to maintain large banks of dialup modems (or outsource the dial-in to a vendor) so that workers could remotely access the corporate network with modems. In both cases, the goal was to extend the corporate network to remote locations and individuals.

With the widespread implementation of the Internet, IP connectivity is accessible both from people’s houses as well as public locations, such as airports and coffee shops. Service providers find it more cost-effective ...

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