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Circuit switching and packet switching both are methods of implementing communication channels between nodes in a network .However , there are differences in the communication approach.
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'''Circuit Switching''' | '''Packet Switching'''
In circuit switching , a dedicated communication channel is established . | In packet switching , transmitted data is grouped into suitably sized blocks, called packets, that are transmitted via a medium that may be shared by multiple simultaneous communication sessions.
A physical communication path is established for the entire session of conversation. | Route is established for each packet.
It has fixed bandwith. | It has dynamic bandwidth.
No overhead bits after call setup . | Overhead bits are present in each packet.

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