220-802 Question #990: Real Exam Question with Answer & Explanation

The correct answer is C: The system will attempt to boot from the next device listed in the boot options of the BIOS.. Standard BIOS and UEFI firmware behavior is to check each device in the configured boot order sequentially; if the first device (CD-ROM) contains no bootable media, the firmware automatically moves on to the next listed device.

Question

A computer's first boot device is set to CD-ROM drive, but there is no bootable disk inserted in the CD-ROM. Which of the following will occur?

Options

AThe system will restart until a bootable media is inserted in the CD-ROM drive.
BThe system will hang and the "Non-bootable device found" error message will appear on the
CThe system will attempt to boot from the next device listed in the boot options of the BIOS.
DThe system will hang and the "Operating System missing" error message will appear on the

Explanation

Standard BIOS and UEFI firmware behavior is to check each device in the configured boot order sequentially; if the first device (CD-ROM) contains no bootable media, the firmware automatically moves on to the next listed device.

Common mistakes.

A. The BIOS does not enter an infinite loop waiting for bootable media in a specific drive; it proceeds to the next device in the boot sequence.
B. A 'Non-bootable device found' error halt would only occur on specific older BIOS implementations; standard behavior is to try the next device.
D. An 'Operating System missing' error appears only when no device in the entire boot order contains a valid bootable partition, not when a single device is skipped.

Concept tested. BIOS sequential boot order fallback behavior

Reference. https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/boot-and-uefi

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