The answer is that the camera permission for the app has been denied. This is the most likely cause because the app functions correctly on other tablets, isolating the problem to the specific device’s configuration rather than a hardware failure or app incompatibility. On Android, each app must be explicitly granted runtime permissions for sensitive hardware like the camera; if the permission was accidentally denied during setup or by a security policy, the app cannot access the camera even though the hardware works. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of mobile operating system permissions and troubleshooting application-specific hardware access. A common trap is assuming a hardware defect or a corrupted app, but the exam emphasizes checking permission settings first, as they are the most frequent cause of isolated app failures. Remember the mnemonic “P.A.D.”—Permission, App, Device—always verify permissions before assuming a hardware or app issue.
220-1101 Mobile Device Application Support Practice Question
This 220-1201 practice question tests your understanding of mobile device application support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is deploying a new Android app across several company tablets. The app requires access to the device's camera to scan barcodes. During testing, the app fails to open the camera on one tablet but works on others. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The camera permission for the app has been denied.
This question focuses on mobile app permissions and hardware access. Since the app works on other tablets, the issue is specific to the failing device. The most common cause is that the camera permission was denied for that app. Checking and granting the permission in Settings should resolve it.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The tablet's camera hardware is defective.
Why it's wrong here
A hardware defect would affect all camera apps, not just this one, and the scenario does not mention other camera apps failing.
✗
The app is not compatible with the tablet's Android version.
Why it's wrong here
If compatibility were the issue, the app would likely fail on all tablets with the same OS, not just one.
✓
The camera permission for the app has been denied.
Why this is correct
If the permission is denied, the app cannot access the camera, causing it to fail on that specific device.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The tablet's storage is full, preventing the app from saving photos.
Why it's wrong here
Storage fullness might affect saving images but would not prevent the camera from opening initially.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Scenario analysis trap
A hardware defect would affect all camera apps, not just this one, and the scenario does not mention other camera apps failing.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
Mobile Device Application Support — This question tests Mobile Device Application Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The camera permission for the app has been denied. — This question focuses on mobile app permissions and hardware access. Since the app works on other tablets, the issue is specific to the failing device. The most common cause is that the camera permission was denied for that app. Checking and granting the permission in Settings should resolve it.
What should I do if I get this 220-1201 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 220-1201 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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