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Virtual Private Network

Organisations with multi-location operation need connectivity between the main office and the remote branch offices. In the past organisations had no other alternative but to lease considerably expensive private leased lines in order to provide direct connectivity between the offices. Now with Internet access becoming cheap, a solution based on Internet, as a medium of communication between the offices, has cpme out, which is economical and easy to implement.
However, use of this public medium, i.e. Internet, as carrier of information is a big risk. There will be no privacy on this channel and while providing other offices access to internal resources, actually everyone on the Internet get similar access.
To take care of this security risk, people are building up Virtual Private Networks or VPNs. VPNs provide a private channel over the Internet between the two communicating offices so that the two offices can communicate with each other in such a way that it appears like the offices are directly connected over a private leased line. The session between the two offices is private (because the link is encrypted). This kind of links are convenient, because each can see each others' internal resources without showing them off to the entire world. 
Most of the firewall vendors can build VPN channels between offices using Internet. Using the same tehnology one can connect several offices easily.