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VPN or Virtual Private Network is a connection between a network with other networks in private over the public network. or in other words to create a separate WAN actual both physically and geographically so logically form a single netwok, packet data flowing between the site and from remote access to users who do will have encryption and authentication to ensure the security, integrity and validity of the data. because the network is private, where only certain people can access it. Transmitted data was encrypted so that secure and remains confidential even though sent over a public network. To ensure security and data connections, VPN employs several security methods such as : Firewall, Encryption, IPSec, AAA Server.
Reason why must use vpn than usual connection is the range of the local network owned by a company will become widespread so that the company can develop its business in other areas , the company operational costs will also be reduced when using VPN , internet media has spread throughout the world , because the Internet is used as a public communication media that are open , can open blocked sites , surf the Internet without being tracked original IP that we can secure from hackers , security of information we receive or send very secure because the data is encrypted VPN 128 bit / 1024 bit , faster internet speeds and more stable etc.