Switched virtual circuits (SVCs)
provide an economical way to connect to a Frame Relay network.
An SVC is a type of circuit that is brought up only when there is data to send. These circuits provide
temporary connectivity to the network on an as-needed basis. Switched virtual circuits are used with
many technologies—for example, a standard telephone call.
It is rare to find a Frame Relay SVC connection, and indeed, you might never see one. Typically,
PVCs are the only connections used with Frame Relay, although Cisco routers do support
Frame Relay with SVCs.
NOTE: Because they are rarely used, SVCs are not covered further in this book and are
not on the Remote Access exam.