Multiple choice technology mainframe

Which one of the following is true about Central and Auxiliary storage in Z/OS

  1. Central storage is accessed asynchronously with the processor and Auxiliary storage is accessed synchronously

  2. Central storage is accessed synchronously with the processor and Auxiliary storage is accessed asynchronously

  3. Both Central storage and Auxiliary storage is accessed asynchronously with the processor

  4. Both Central storage and Auxiliary storage is accessed synchronously with the processor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Central (real) storage is directly connected to the processor and accessed synchronously at CPU speeds. Auxiliary storage acts as secondary storage and is accessed asynchronously because it requires I/O operations that take much longer than CPU cycles.

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