Which of the following could be used to automatically establish communication between the operating system and primary job entry subsystem during IPL?

  1. JES

  2. IODF

  3. Master JCL procedure

  4. Communications Server


Correct Option: C

AI Explanation

To answer this question, you need to understand the concept of Initial Program Load (IPL) and the components involved in establishing communication between the operating system and the primary job entry subsystem during IPL.

During IPL, the operating system needs to establish communication with the primary job entry subsystem to perform various tasks, such as loading system programs and initializing devices. The component that facilitates this communication is called the Master Job Control Language (JCL) procedure.

Option A) JES - JES stands for Job Entry Subsystem and is responsible for managing job processing in an operating system. While JES is involved in job processing, it is not directly responsible for establishing communication between the operating system and the primary job entry subsystem during IPL. Therefore, this option is incorrect.

Option B) IODF - IODF stands for Input/Output Definition File and is used to define and configure devices in an operating system. While IODF is involved in device configuration, it is not directly responsible for establishing communication during IPL. Therefore, this option is incorrect.

Option C) Master JCL procedure - This option is correct. The Master JCL procedure is a set of instructions written in JCL that is executed during IPL to establish communication between the operating system and the primary job entry subsystem. It includes instructions for loading system programs, initializing devices, and configuring system settings.

Option D) Communications Server - While a Communications Server may be used to establish communication between different systems or components, it is not specifically used to establish communication between the operating system and the primary job entry subsystem during IPL. Therefore, this option is incorrect.

The correct answer is C) Master JCL procedure. This option is correct because the Master JCL procedure is specifically designed to establish communication between the operating system and the primary job entry subsystem during IPL.

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