Discussion
In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM ?
Answer: B
The delay from storing and retrieving data in RAM occurs in time division circuit switching.
A time-slot interchange in a time division switch writes the incoming slots into memory (RAM) and reads them out in a different order for the outgoing line, which adds a delay. A space division switch (A) joins lines by crosspoints with no storage and so introduces no such delay. Virtual circuit and packet switching (C and D) are not types of circuit switching in this sense.
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