PP Presentation

• virtual circuits are used in subnets with a connection-oriented goal. When a connection is released, the virtual curcuit is discarded. For each VC the IMP must remember where to forward the packets and use a table to keep track. Each packet has a VC number field in the header. VC numbers must be unique.
• datagrams have no routes set in advance (unlike VC). Each packet is routed independently. This is more robust in the presents of failure and congestion.

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