220-1102 Operating Systems Practice Question
A technician is troubleshooting a Windows 10 Pro workstation that fails to start. The system displays a message that the Boot Configuration Data (BCD) file is missing or corrupt. The technician has booted the computer from a Windows 10 installation USB and opened a command prompt. Which command should the technician run to rebuild the BCD?
⚠ Common exam trap
It's easy for candidates to confuse boot sector repair commands with BCD repair commands, as both are part of the bootrec utility but address different boot problems.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
bootrec /rebuildbcd
When the BCD is missing or corrupt, the technician should use the bootrec /rebuildbcd command from the Windows Recovery Environment. This command scans for Windows installations and rebuilds the BCD store, allowing the system to boot again. It is the standard repair method for BCD corruption in Windows 10.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
bootrec /rebuildbcd
Why this is correct
The bootrec /rebuildbcd command scans all disks for Windows installations and allows the technician to add them to the BCD store. It rebuilds the Boot Configuration Data from scratch, which directly addresses a missing or corrupt BCD. This is the correct command to run after booting from installation media when the BCD is damaged.
- ✗
bcdedit /export C:\BCD_Backup
Why it's wrong here
The bcdedit /export command exports the current BCD store to a file for backup purposes. It does not rebuild or repair a missing or corrupt BCD. In fact, if the BCD is already corrupt, the export may fail or produce an unusable backup. This command is used proactively to save a known-good configuration, not to recover from BCD corruption.
- ✗
bootrec /fixboot
Why it's wrong here
The bootrec /fixboot command writes a new boot sector to the system partition. It is used when the boot sector is corrupted or replaced by a non-Windows boot sector. However, it does not rebuild the BCD store. If the BCD is missing or corrupt, /fixboot will not restore the boot configuration, so it does not solve the problem in this scenario.
- ✗
bootrec /fixmbr
Why it's wrong here
The bootrec /fixmbr command writes a new master boot record to the system partition. It repairs the MBR but does not rebuild the Boot Configuration Data store. If the BCD is missing or corrupt, /fixmbr alone will not resolve the issue because the boot manager still cannot locate the BCD. This command is useful for MBR corruption but not for BCD corruption.
Go deeper
Related to this question
Learn chapter
File Systems: NTFS, FAT32, exFAT
Key term
Windows 10
Windows 10 is a personal computer operating system developed by Microsoft that combines the familiarity of Windows 7 with the modern features of Windows 8, designed to run on a wide range of devices from desktops to tablets.
Key term
Command Prompt
Command Prompt is a text-based interface in Windows that lets you type commands to perform tasks like managing files, troubleshooting networks, or launching programs.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This 220-1102 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1102 exam.