Remote site is access by router in
Remote site is access by router in Virtual circuit.
A virtual circuit is used in transportation of data over a packet switch computer network, in which it appears as if there is a physical path established between the final destination and source and through which all packets can be routed during the call.
A router is a device that analyzes the contents of data packets transmitted within a network or to another network. Routers determine whether the source and destination are on the same network or whether data must be transferred from one network type to another, which requires encapsulating the data packet with routing protocol header information for the new network type.