Why does a circuit-switched network need end-to-end addressing during the setup and teardown phases? Why are no addresses needed during the data transfer phase for this type of network?
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Explanation:
A circuit-switched network need end-to-end addressing during the setup and teardown phases to create a connection for the entire data transfer phase.
Once a connection is made, the data flow through the resources which are reserved. Duration of the entire data transfer, the switches remain connected. There is no necessity for further addressing.
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