- A
The iOS update corrupted the app's data; reinstalling the app will fix it.
Why wrong: While reinstalling can fix data corruption, the root cause is more likely an API incompatibility that only an app update can resolve.
- B
The banking app is not compatible with the new iOS version and needs an update from the developer.
OS updates often require app updates to maintain compatibility; checking for an app update is the correct first step.
- C
The user's account has been locked due to multiple failed login attempts.
Why wrong: Account lockout would show an error message, not cause the app to crash immediately upon login attempt.
- D
The iOS update changed the device's security settings, blocking the app.
Why wrong: Security settings changes would typically block the app entirely, not cause a crash only during login.
Quick Answer
The answer is that the banking app is incompatible with the new iOS version and requires an update from the developer. This is because iOS updates often deprecate older APIs or introduce stricter security protocols, which can cause apps built on previous frameworks to crash when attempting sensitive operations like login. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of OS and application compatibility—a common troubleshooting trap is to blame the device hardware or network, when the real issue is the app’s lack of support for the new OS. A helpful memory tip: think of the OS update as a new lock on the door; the old key (the app) won’t work until the locksmith (the developer) cuts a new one.
220-1201 Mobile Device Application Support Practice Question
This 220-1201 practice question tests your understanding of mobile device application support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 user reports that after a recent iOS update, their banking app crashes every time they try to log in. Other apps work fine. The app was working before the update. What is the most likely cause and solution?
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 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
The banking app is not compatible with the new iOS version and needs an update from the developer.
This question tests understanding of app compatibility with OS updates. iOS updates can deprecate APIs or change security requirements, causing older apps to crash. The app developer must release an update to support the new OS. The technician should check for an app update in the App Store, as the developer likely has a fix.
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 iOS update corrupted the app's data; reinstalling the app will fix it.
Why it's wrong here
While reinstalling can fix data corruption, the root cause is more likely an API incompatibility that only an app update can resolve.
- ✓
The banking app is not compatible with the new iOS version and needs an update from the developer.
Why this is correct
OS updates often require app updates to maintain compatibility; checking for an app update is the correct first step.
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 user's account has been locked due to multiple failed login attempts.
Why it's wrong here
Account lockout would show an error message, not cause the app to crash immediately upon login attempt.
- ✗
The iOS update changed the device's security settings, blocking the app.
Why it's wrong here
Security settings changes would typically block the app entirely, not cause a crash only during login.
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
Command / output trap
Account lockout would show an error message, not cause the app to crash immediately upon login attempt.
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.
What to study next
Got this wrong? Here's your next step.
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.
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Mobile Device Application Support — study guide chapter
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Mobile Device Application Support practice questions
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FAQ
Questions learners often ask
What does this 220-1201 question test?
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 banking app is not compatible with the new iOS version and needs an update from the developer. — This question tests understanding of app compatibility with OS updates. iOS updates can deprecate APIs or change security requirements, causing older apps to crash. The app developer must release an update to support the new OS. The technician should check for an app update in the App Store, as the developer likely has a fix.
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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Last reviewed: Jun 18, 2026
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