COMPTIA A+ Practice Exam

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Ace your COMPTIA A+ certification with our practice exam. Engage with a variety of questions including multiple choice and performance-based, complete with hints and detailed explanations. Prepare effectively and boost your confidence for the big day!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the primary job of the MBR?

To allocate memory
To control the cooling system
To check the partition table for a partition with a valid OS
To manage file storage

The correct answer is: To check the partition table for a partition with a valid OS

The primary job of the Master Boot Record (MBR) is to check the partition table for a partition that contains a valid operating system. When a computer is powered on, the BIOS looks for the MBR on the storage device to determine how to boot the operating system. The MBR includes information about the disk's partitions and the bootloader, which is crucial for initiating the operating system loading process. This function is essential for the proper startup of a computer, as it allows the system to locate the necessary files to load the operating system into memory. The other functions mentioned in the options do not pertain to the primary responsibilities of the MBR. Allocating memory is managed by the operating system, the cooling system is handled by the hardware, and file storage management is also a function of the operating system. Thus, the role of the MBR is specifically centralized on the boot process and identifying valid partitions for operating system booting.