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FC0-U71 Practice Question: Ensure data redundancy in case of a single hard…
A company wants to ensure data redundancy in case of a single hard drive failure. Which RAID level should they use?
⚠ Common exam trap
A common mix-up: candidates confuse RAID 5 as the 'standard' redundancy option due to its efficiency, but the question specifically asks for redundancy in case of a single drive failure with no mention of capacity optimization, making RAID 1 the simplest and most direct answer.
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
✓
RAID 1
RAID 1 (mirroring) writes identical data to two or more drives simultaneously, providing full data redundancy. If one drive fails, the system continues to operate using the mirrored copy, ensuring no data loss and minimal downtime. This makes RAID 1 the correct choice for protecting against a single hard drive failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RAID 0
Why it's wrong here
RAID 0 stripes data without parity, offering no redundancy.
- ✗
RAID 5
Why it's wrong here
RAID 5 provides redundancy but requires three or more drives and is not the simplest choice for single drive failure.
- ✗
JBOD
Why it's wrong here
JBOD simply spans drives without redundancy.
- ✓
RAID 1
Why this is correct
RAID 1 mirrors data across two drives, providing fault tolerance for a single drive failure.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.