Although VPN’s are considered as an extension of a private network, in reality they are nothing close to the equivalent of a private network. This is so because you can’t compare physically connected devices in a closed environment to a remote connection.
Some advantages of a VPN connection are as follows:

Expensive long distance leased lines are [...]

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For the purposes of this chapter, a remote office is defined as any home office, branch office, or sole office of a small business connected to either a private network or to the Internet. In this chapter, attention is paid to the local connections within a remote office as well as to the connections [...]

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Introduction
Advances in communication technologies, driven by the need to keep costs down and stay competitive in an expanding marketplace, enable organizations not only to maintain communication channels 24 hours a day, seven days a week, but also to provide connectivity to business data and services from remote locations.
The Internet provides organizations and individuals with the [...]

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Q. For which operating systems and with which protocols does Microsoft provide remote access VPN clients?
A. Microsoft provides Point-to-Point Tunneling Protocol (PPTP)–based remote access clients with Windows 98 (all versions), Windows Millennium Edition (Me), Windows NT 4.0, Windows 2000, Windows XP, and Windows Server 2003. Microsoft provides Layer Two Tunneling Protocol with Internet [...]

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In a typical enterprise deployment, the certificate infrastructure is configured using single-root certification authority (CA) in a three-level hierarchy consisting of a root CA, intermediate CAs, and issuing CAs. Medium-sized organizations should use a two-level hierarchy consisting of a root CA and issuing CAs. Small organizations can use a single CA that is both the [...]

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To secure the VPN server from sending or receiving any traffic on its Internet interface except VPN traffic, you need to configure Point-to-Point Tunneling Protocol (PPTP) or Layer Two Tunneling Protocol with Internet Protocol Security (L2TP/ IPSec) input and output filters on the interface that corresponds to the connection to the Internet. Because IP routing [...]

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Stick to the Standards
If there is one mantra that the Microsoft Windows Networking and Communications group lives by, it is “Stick to the IETF RFC standards.” If we need to make a new protocol or procedure to use in Microsoft Windows, we always present it for consideration to the Internet Engineering Task Force [...]

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