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1. Introduction to Network Protocols > 1.4 Virtual Circuit

1.4 Virtual Circuit

Some network protocols create virtual circuits in networks. A virtual circuit is conducted through the network and all packets of a particular connection go via the circuit. If the circuit gets interrupted anywhere, then the connection is interrupted, a new circuit is established, and data transmission continues.

1.4 Virtual Circuit

Figure 1.16: Virtual circuit

In the figure above, a virtual circuit between nodes A and D is established via nodes B, F, and G. All packets must go through this circuit.

Datagrams can be transmitted via the virtual circuit in two ways:

  • The circuit does not guarantee the datagrams delivery to its destination. (If network congestion occurs, the circuit can even throw the datagram away.) An example is the Frame Relay protocol.

  

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