Virtual Private Network

VPN Pricing

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VPN Basics

VPN is the abbreviated term for Virtual Private Network. A VPN is close in function to that of a private or point-to-point network. The exception to the privacy of a virtual private network is that its resources are on a leased public switched network.

A VPN can be offered priority access to bandwidths, which can comparatively come close to the bandwidths in a dedicated point-to-point line. The Virtual private network may have its priority access to leased bandwidths, but it still will not be the guaranteed access that a private leased line has.

Another difference between a virtual private network and a private line are its strengths in the security sector. A Virtual Private Network can have a barrage of effective security mechanisms in place, but a private dedicated line will always hold the much higher-ranking title of "completely secure."

These differences are due to the methods the lines for transmission are handled by the network provider. The bandwidth or line that is leased for a true private or point-to-point network is taken out of the shared public switched network for the sole use of the end user(s). This means that the client private line(s) dedicated to the network are routed around the various public switches instead of through them. It is this method that guarantees the secure transmissions of voice and data between two or more points in a private point-to-point network. A VPN however, can only act as a private line for transmission. The network in a VPN is only virtually private and all transmissions are physically routed through the provider's public switches.

One winning advantage of a Virtual private Network is cost. When compared to the cost of dedicated private networks and lines, a VPN is a very cost efficient communication vehicle for the growing needs of many expanding enterprises. When many smaller branch locations need secure transmissions for communication between each other and Mother Enterprise, the ease of transitioning to VPN and low hardware overhead make a very attractive alternative to building costly and expansive private dedicated lines and networks.

Virtual Private Networks are becoming a more attractive alternative to normal private networks mainly due to the reduced upkeep and costs of utilizing a VPN.

Costs are significantly reduced by the fact that the actual private network is being managed and maintained through an outside carrier. Customers carry only the responsibility of connecting their dial-up or dedicated service lines to the carrier's network providing the VPN services.

A Virtual Private Networks allow a LAN friendly environment to take place for companies with multiple branches and personnel over different geographical regions. Many companies don't need to upgrade equipment for a VPN due to LAN equipment usually already being in place.

There are different types of VPN. One type of VPN is modeled for voice applications and is recognized as SDN. The abbreviated term means Software-Defined Network. The term SDN was first named by AT&T. This particular type of VPN is most commonly used for voice applications and is offered to the public via Interchange (IXC's). SDN uses circuit-switched Public Switched Telephone Networks for VPN voice communications as well, which help keep continuous redundancy within the VPN. SDN voice transmissions are provided over Trunk Carrier local loops using T1, fractional T1, and so on.

IXC's offer SDN services in 56/64 Kbps, fractional 56/64 Kbps, 384 Kbps, and T1 1.544 Mbps. VPN 384 Kbps and T1 accessed SDN is primarily used for videoconferencing.

SDN uses Closed User Groups or CUG through PSTN to deliver voice transmissions. The CUG is the security feature used for these voice transmissions. CUG's allow only calls within the VPN to be securely connected or made.

One very attractive trait of an SDN is its likelihood of catastrophic failure. A VPN is far less prone to catastrophic failure than a private leased line. As a matter of fact VPNs are implemented on a frequent basis for back up of private dedicated lines.

All calls within a SDN based VPN are charged by usage in minutes and the time of day. Per minute rates increase during primetimes as well as discounts being applied to lower traffic times of the day or week. Distance can also become a determining factor in your billing. These rates however tend to cost less than normal dial-up, so having a VPN is still justified in it's cost effectiveness.

Although X.25, TCP/IP, frame relay, and ATM networks are all different in their specific nature of function, they all hold some very similar characteristics that can be implemented through the use of VPN. Since each type of network is used and executed differently, each VPN will use a variety of method and security mechanisms particular to that specific network.

Internet based VPNs or IP VPNs have many common and practical uses in today's business climate. Common uses for an IP VPN include remote access, intranet's, and extranets.

IP VPN Remote Access is ideally used for telecommuting, virtual employees, and other mobile work forces.

An IP VPN Intranet is used to virtually link together branch locations, regional office locations, and corporate office locations.

An IP VPN Extranet links company affiliates, vendors, distributors and company agents together to the main corporate office.

VPN over the Internet is the most commonly used and recognized VPN, also known as an IP VPN. Congestion and security issues are abundant and ever growing within the architecture of the Internet. For a VPN to become redundant and secure over the Internet many procedures and protocols are put in place.

One method of security in use by an Internet based or IP VPN is the use of Authentication.

Authentication most commonly uses password protection and/or intelligent tokens. Authentication is necessary to help ensure that only proper personal are entering and accessing the IP VPN. Authentication takes place at the point of attempted entry making it the front door guard.

An access server usually is responsible for the method and execution of the authentication process. The access server is connected to a firewall and runs the RADIUS (Remote Access Dial-In User Service) for the IP VPN.

Encryption is another way VPNs secure transmissions. Encryption scrambles or encodes a payload of data that must be authenticated with a key by the receiving end of the VPN before the decryption of data can take place.

Virtual Private Networks also deploy a method called tunneling which encapsulates the data within an IP packet before transmitting the information.

These three methods along with end user firewall software and hardware are making VPNs are more secure IT commodity. With affordability a VPN is desirable in protecting bottom lines. In fact, many U.S. Government branches now actively use VPN in their communications, although point-to-point is still preferred within more security strict branches.

The carrier cannot put these security measures in place unless the customer uses a "VPN Switch."

VPN customers also commonly include their own firewalls (electronic and software) to their VPN to help curb the risk of electronic snooping and sabotage (viruses and worms)