Virtual Private Networks—Connectivity for Remote Access, Intranets and Extranets
A virtual private network (VPN) has all of the features of a private network where dedicated lines tie sites together. However with VPNs, the network connections between sites are shared by multiple organizations. A carrier manages the network. The customer connects dedicated or dialup lines to the carrier's network. The carrier is responsible for connections between customer sites. Many VPNs are based on the Internet Protocol. (See Figure 5.6.) The three most common applications for virtual private networks are:
Remote access for telecommuters and employees that travel
Intranet connectivity for branch offices
Extranet links for business partners
Figure 5.6. A virtual ...
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