What is the primary function of permanent virtual circuits (PVCs)?

The primary function of permanent virtual circuits (PVCs) is to provide a constantly available connection. PVCs are predefined connections established in a network, typically used in Frame Relay and other packet-switched networks, where the path is set up beforehand and remains active for the duration of the communication. This allows for efficient data transfer as the overhead associated with establishing and tearing down connections is minimized.

The constant availability of the connection means that data can flow easily between two endpoints without needing to establish a connection each time data needs to be sent. This is particularly beneficial for applications requiring consistent and reliable communication, such as voice and video services. Overall, PVCs offer a streamlined way for devices to communicate over a network, enhancing performance and reliability.