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Overview of VPNs

Many companies are increasingly concerned about security because of Remote Access users. One way the administrator can increase the security of RAS connections is through the use of Virtual Private Networking. The following section simply introduces the concept of a VP; and PPTP, L2TP, and IPSec as protocols available to Windows 2000 RAS administrators. Keep in mind that there are volumes of books available on these subjects, and this section simply alerts you to some of the alternatives available to you.

As acronyms go these days, often their meaning is not intuitive to their functionality. However, VPN, or Virtual Private Network, is a very intuitive acronym: Virtual (the creation of an abstract concept through protocols), Private (not accessible to the general public), Network (nodes and devices that are able to communicate). VPNs are used to connect a user, computer, or network to another user, computer, or network—typically through a third segment that is untrusted or unprotected. VPNs are commonly used to allow remote mobile users to connect to the corporate LAN securely or to connect two discontiguous segments.


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