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Sub-Interface

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Why is Sub-Interfacing is use in configuring a router? What is the purpose for this? For example, I have 1 serial port named Serial 0/0 and our Network admin used the configurationi and named it Serial 0/0.2. Why is that?

I'm just new in Cisco router configuration. Could you please help me.

Your immediate response will be much appreciated.
Thanks.

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by montea7

Subinterfaces allow multiple virtual circuits on a single serial interface.Each subinterface is treated as a seperate interface.

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