Packet switching is a WAN switching
method in which network devices share a permanent virtual
circuit (PVC), which is like a point-to-point link to
transport packets from a source to a destination across a carrier
network, as shown in the Figure. Frame Relay, SMDS, and X.25 are all examples of
packet-switched WAN technologies.
Switched networks can carry
variable-size frames (packets) or fixed-size cells. The most common
packet-switched network type is Frame Relay.
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