Virtual circuit

A connection-oriented protocol located at layer 4 of the OSI model. The major transport protocol in the Internet suite of protocols providing reliable, connectionoriented, fullduplex streams.
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A virtual circuit connection established across a network on an asneeded basis and lasting only for the duration of the transfer. A virtual circuit that must be rebuilt each time it is used; similar to a dial-up connection.
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A software simulation of a computer within which a process executes. Each virtual machine has its own memory address space, and communication between virtual machines is securely controlled.
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Virtual private networks that depend on services offered by phone companies of various nationalities.
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A network connection established between two systems over an existing private or public network. A VPN provides confidentiality and integrity for network traffic through the use of encryption. A secure private network that uses the public telecommunications infrastructure to transmit data. In contrast to a much more expensive system of owned or leased lines that can only be used by one company, VPNs are used by enterprises for both extranets and wide are intranets. Using encryption and authentication, a VPN encrypts all data that passes between two Internet points, maintaining privacy and security. Protected information system link utilizing tunneling, security controls (. See information assurance), and endpoint address translation giving the impression of a dedicated line.
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