Discussion
Which one of the following is not a switching system ?
Answer: C
Packet switching, circuit switching and message switching are the three switching systems used in data communication. A router is a device that forwards packets between networks, not a switching system. Circuit switching sets up a dedicated path, as in the telephone network, and message switching stores whole messages and passes them on, while packet switching breaks data into packets. The answer is the router. Message switching is the oldest of the three, used in telegraph systems.
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