- A
The keyboard's battery is low
Why wrong: Low battery can cause intermittent issues, but it usually results in disconnection rather than slow typing with missed keystrokes. The scanner works fine, suggesting the Bluetooth radio is functional.
- B
The tablet's Bluetooth driver is outdated
Why wrong: An outdated driver could cause general Bluetooth issues, but the scanner works perfectly, making a driver problem less likely.
- C
Interference from the rugged case or other wireless signals is degrading the keyboard's connection
Rugged cases can contain metal or shielding that interferes with Bluetooth signals. The keyboard's antenna may be more susceptible than the scanner's.
- D
The keyboard is not compatible with Android
Why wrong: If the keyboard pairs and connects, it is compatible. Missed keystrokes are a performance issue, not a compatibility one.
Quick Answer
The answer is interference from the rugged case or other wireless signals degrading the keyboard’s connection. Bluetooth operates in the 2.4 GHz frequency band, which is crowded with signals from Wi-Fi, USB 3.0 ports, and even the metal components of a rugged case that can physically block or reflect radio waves. This signal degradation causes packet loss, resulting in slow or missed keystrokes, while the barcode scanner may remain unaffected because it uses a different Bluetooth profile (like HID over GATT) or is less sensitive to interference. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of Bluetooth interference sources and troubleshooting—a common trap is assuming the keyboard is defective or that the tablet’s Bluetooth adapter is faulty. Remember the memory tip: “Case and waves cause delays and saves”—the rugged case and surrounding wireless signals are the culprits, not the devices themselves.
220-1201 Mobile Devices Troubleshooting Practice Question
This 220-1201 practice question tests your understanding of mobile devices troubleshooting. 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 technician is configuring a new Android tablet for a field worker. The worker will use a Bluetooth barcode scanner and a rugged case with a built-in keyboard. After pairing both devices, the keyboard types slowly and misses keystrokes, while the scanner works fine. 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 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
Interference from the rugged case or other wireless signals is degrading the keyboard's connection
Bluetooth interference from other devices or physical obstructions (like a rugged case) can cause signal degradation, leading to missed keystrokes. The scanner may use a different Bluetooth profile or be less sensitive to interference. The correct answer identifies interference as the likely cause.
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 keyboard's battery is low
Why it's wrong here
Low battery can cause intermittent issues, but it usually results in disconnection rather than slow typing with missed keystrokes. The scanner works fine, suggesting the Bluetooth radio is functional.
- ✗
The tablet's Bluetooth driver is outdated
Why it's wrong here
An outdated driver could cause general Bluetooth issues, but the scanner works perfectly, making a driver problem less likely.
- ✓
Interference from the rugged case or other wireless signals is degrading the keyboard's connection
Why this is correct
Rugged cases can contain metal or shielding that interferes with Bluetooth signals. The keyboard's antenna may be more susceptible than the scanner's.
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 keyboard is not compatible with Android
Why it's wrong here
If the keyboard pairs and connects, it is compatible. Missed keystrokes are a performance issue, not a compatibility one.
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.
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 Devices Troubleshooting — study guide chapter
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Devices Troubleshooting — This question tests Mobile Devices Troubleshooting — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Interference from the rugged case or other wireless signals is degrading the keyboard's connection — Bluetooth interference from other devices or physical obstructions (like a rugged case) can cause signal degradation, leading to missed keystrokes. The scanner may use a different Bluetooth profile or be less sensitive to interference. The correct answer identifies interference as the likely cause.
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
This 220-1201 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 220-1201 exam.
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