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trini22 asked
In X.25, why is the virtual circuit number used by one station of two communicating stations different from the virtual circuit number used by the other station? After all, it is the same full-duplex virtual circuit.
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Top Expert 2007
Think of it as an Ip address. It needs to be unique to be able to map to it. When the tcp packet is encapsulated and sent thru the packet switching network the vc acts as it's destination and determines it's route the switched network.

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