The Frame Relay packet-switching protocol operates at the physical and data link layers in a network to optimize packet transmissions by creating virtual circuits between hosts. Figure 8 shows a typical Frame Relay network.
Figure 8: Frame Relay Network
Figure 8 shows multiple paths from Host A to Host B. In a typical routed network, traffic is sent from device to device with each device making routing decisions based on its own routing table. In a packet-switched network, the paths are predefined. Devices switch a packet through the network according to predetermined next-hops established when the virtual circuit is set up.
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