mediumMultiple Choice
FC0-U71 Practice Question: A user wants to ensure data is not lost in the…
A user wants to ensure data is not lost in the event of a drive failure. Which storage configuration provides redundancy?
⚠ Common exam trap
It's easy for candidates to confuse RAID 0 (striping for performance) with providing redundancy, or they think JBOD offers some form of protection because it combines drives, but neither provides fault tolerance.
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, so if one drive fails, the data remains accessible from the other drive(s). This provides fault tolerance and ensures no data loss during a single drive failure, meeting the user's requirement for redundancy.
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 1
Why this is correct
RAID 1 mirrors identical data across two drives, so a single drive failure leaves a complete copy accessible. This satisfies the stem's redundancy requirement, unlike RAID 0, which stripes without parity and loses everything if one drive fails.
- ✗
JBOD
Why it's wrong here
JBOD concatenates disks into one logical volume with no mirroring or parity, so any single drive failure loses the data on it. It is tempting because it pools capacity cheaply and simply, and would suit scenarios needing maximum usable space without redundancy, not protection against drive failure.
- ✗
RAID 0
Why it's wrong here
RAID 0 stripes data across disks purely for performance and capacity, with no mirroring or parity, so one failed drive destroys the array. It is tempting because striping is fast and space-efficient, and would be correct where speed matters and data is reproducible or backed up elsewhere.
- ✗
Single drive
Why it's wrong here
A single drive has no second disk to mirror or parity to rebuild from, so its failure means total data loss. It is tempting for simplicity and cost, and would be acceptable where data is disposable or already replicated externally, but it cannot satisfy a redundancy requirement.
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.