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What is a VPN? A simple definition of Virtual Private Network, or VPN, as it is commonly known, is the use of a public network - mainly the Internet, to create private, secure wide area networks. A more formal definition of a VPN: a combination of tunneling, encryption, authentication, and access control technologies and services used to carry traffic over the Internet, a managed IP network or a provider's backbone. The traffic reaches these backbones using any combination of access technologies, including T1, frame relay, ISDN, ATM or simple dial-up access. VPN Technologies As stated above, there's one thing all virtual private networks have in common: They all share the same core set of technologies, which consists of tunneling, encryption, authentication and access control. Tunneling. Tunneling is at the core of all VPN implementations. There are basic classes of tunnels: end-to-end tunneling and node-to- node tunneling. With end-to-end the tunnel extends from a remote user!'s PC to the server that the user is connecting to. In this type of scenario, the devices at each end of the connection must handle the establishment of tunnels, and also encrypt and then decrypt the data that's being passed between the two points. The sec
authentication by maintaining a centralized database of access rights. Administration is streamlined because IT managers can use a single RADIUS server to authenticate users dialing into multiple remote-access servers, rather than have to authenticate the users to each RAS individually. VPN Applications Remote Access. When it comes to remote-access VPNs, the basic concept is to give telecommuters and mobile workers a way to get back to a corporate network over the Internet or a service provider's backbone. In a remote-access VPN, a user dials into a service provider's point of presence (POP), establishes a tunnel back to headquarters over that provider's network or the Internet, and authenticates to gain access to the corporate network. That is in contrast to the traditional dial-up approach where a user dials into a bank of modems or a remote-access server located within the corporate headquarters. There are a number of reasons to use a VPN for remote access. First, there is! it within Windows. As implied by the name, this protocol is typically used in end-to-end tunneling applications. IPSec was developed by the Internet Engineering Task Force as a security mechanism to protect IP packets. It is commonly used in both end-to-end and node-to-node applications. The third, L2TP, came out of a mix of the PPTP and another less known protocol developed by Cisco - Layer 2 Forwarding. This combination is frequently used in node-to-node applications. Encryption. VPN's also use encryption technology to ensure the confidentiality of data as it passes over the Internet. The encryption technologies used in VPNs are the same ones used in any other networking situation where data is encrypted. The choice of encryption technology is generally not an issue, since most equipment vendors support the major encryption choices on the market. A decision must be made in the area of key size, however. The general idea is that the larger the key is, the more difficult it i! PN to link its branch offices, then expand the access to single remote users and ultimately open up the network to outsiders, all using the same equipment and services. Why VPN? Remote and branch office connectivity has been a staple of a lot of companies for many years. Which poses the question: Why are VPNs even necessary? The answer is a simple one - it's all about money. The costs of using traditional remote access technology is skyrocketing and will only get higher as more users and sites need to be connected. Market research has shown that the total equipment costs account for only about 15 - 20% of the total cost of ownership when connecting users and sites. The majority of the cost to support remote access for a three- to five-year period comes from two areas: recurring telecommunications costs and the operational costs to support the users and manage the equipment. Long distance charges alone can kill a RAS project. At 10 cents a minute it would cost about $240 per mo! ted. To do this, companies let these people telecommute full time rather than move them closer to the office. Also, in today's work force most companies consider e-mail essential, and even more so for those workers who travel. Another driving force is the move away from large corporate offices, in exchange for a smaller, more "localized" presence. Yet despite the geographic differences, companies still want the economies and convenience of shared applications. And in today's globa
Some common words found in the essay are:
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Approximate Word count = 2314
Approximate Pages = 9 (250 words per page double spaced)
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