WAN Virtual Circuits

Virtual circuits are logical circuits created to ensure reliable communication between two network devices. Two types of virtual circuits exist:

• Switched virtual circuits (SVCs)—Virtual circuits that are dynamically established on demand and terminated when transmission is complete. Communication over an SVC consists of three phases: circuit establishment, data transfer, and circuit termination.

• Permanent virtual circuits (PVCs)—Permanently established virtual circuits that consist of one mode: data transfer.

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