1. On the other hand, permanent virtual circuits are preconfigured into the network. 2. Tymnet II's different method of constructing virtual circuits allowed for much better scalability. 3. A DLR may describe an end-to-end circuit that comprises physical or virtual circuits . 4. Connection-oriented communication may be a circuit switched connection, or a packet-mode virtual circuit connection. 5. LMI virtual circuit status messages provide communication and synchronization between Frame Relay DCE devices. 6. In " LLC Encapsulation " the hosts use a single virtual circuit for multiple protocols. 7. With virtual circuit multiplexing, the communicating hosts agree on the high-level protocol for a given circuit. 8. Virtual circuits are especially useful in building robust failover mechanisms and allocating bandwidth for delay-sensitive applications.9. Multiple virtual circuits can be active on the same physical end-points ( performed by using subinterfaces ). 10. The VPI is useful for reducing the switching table of some virtual circuits which have common paths.
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