Can someone explain to me about VPN (Virtual Private Network)?

Question

Why is it more cost-effective? How does it work?

Answer 1

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Answer 2

A VPN, or Virtual Private Network, is an encapsulated protocol that allows secure communication between sites or between a site and a single computer.

I know that sounds confusing, but let's break it down. First, to explain how an encapsulation works-- Let's say there's 2 executives and each has a secretary. One writes a note to the other but doesn't want the secretaries to read it so he puts it in an envelope and gives it to his secretary who in turn hands it to the other exec's secretary. It's then passed to it's final destination without the messenger having information about the contents.

Now to put that analogy to work, I have what's called a VPN client on my computer- It's the envelope in my case. Any traffic directed at it gets encrypted and gets sent over the internet (secretary) and at the other end of the vpn the data is unencrypted (open the envelope) and the data is sent quickly and securely. Since the data encryption process is handled by the endpoints, the contents cannot be gotten via packet sniffing methods so it's secure.

I hope this paints a better picture of how VPN's work- Someone pointed at the wikipedia page- It's very much worth a look.

Answer 3

A data network that uses the public telecommunications infrastructure, but maintains privacy through the use of a tunneling protocol and security procedures. A VPN gives a company the same capabilities as a system of owned or leased lines to which that company has exclusive access. However, costs are much lower because the VPN uses the shared public infrastructure rather than exclusive line access.

Answer 4

VPN or virtual private network is provided as an extended service to clients who require high data transmissions and the entire line is leased out to them. They are at will to use the network as they like it after paying a decent amount of money. The permissions are granted to all the users of VPN by a central administrator and these networks can be used by companies which have various offices in different countries.

Answer 5

VPN is a way of "fooling" a network into thinking that you are actually sitting on the premises, physically plugged into one of the LAN ports. "Fooling" is not the right word...it sounds mischievious...

Here's a hypothetical situation that might help:

ABC Company HQ in New York City. ABC has a high-speed LAN, including a datacenter at HQ. You have just been hired to seek new clients in Los Angeles, so you live in CA. But you need to securely access the corporate network in NYC. You basically have 2 choices:

1. Set up a Permanent Virtual Circuit over a Frame Relay WAN or an ATM WAN. This is a separate connection from your internet connection. If it's just you, then you would probably have a T1 with an agreed-upon bandwidth of 256k. In addition to this T1, you would also have a separate connection for the internet, e.g. DSL. So you are paying for two connections here.

2. Instead of paying for the PVC on a T1, you just connect via VPN over your DSL internet connection. This gives you as much access to the corporate network as scenario 1, but you only have to pay for one WAN connection instead of two. You would incur costs in terms of buying VPN accelerators or VPN capable routers, plus the client software, but over the long-term these would be offset by the savings resulting from not having to pay for the 2nd connection. Plus, VPN hardware can be scaled for more users.

Answer 6

VPN gives extremely secure connections between private networks linked through the Internet. It allows remote computers to act as though they were on the same secure, local network.

Advantages

Allows you to be at home and access your company's computers in the same way as if you were sitting at work.
Almost impossible for someone to tap or interfer with data in the VPN tunnel.
If you have VPN client software on a laptop, you can connect to your company from anywhere in the world.

Answer 7

not sure about the cost, but esentialy a VPN would allow a secure entrance for authorized users to remotely access a LAN through a WAN (allowing work to be completed at home)

Answer 8

When your income is variably dependent on social connection, an multi private network is speedily expandable while a socially closed internal web is not.

Answer 9

It allows computers that maybe miles apart to exist on the same network, make use of the same devices on the network, such as printers and file servers etc.

Answer 10

hi, need not to worry click the link below and you will find out. Its in very detail with diagrams. The website is www.howstuffworks.com

http://computer.howstuffworks.com/vpn.htm/printable

You will also find many more questions and answers.

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