virtual private networks
"A n/w established over a carrier's digital phone lines and dedicated solely to connecting several specific client sites, used to implement WAN's by using the internet to create a quasi private n/w"
"in short it is private n/w operated over a public network such as an internet"
It is virtual because it is not made of leased lines.It's private because data that travels over the internet is encrypted using what's called a tunneling protocol.A protocol that ensures that data passing over a company's vpn is secure. And it is a n/w because it connects computers and n/ws together
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