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220-1201 Practice Question: A technician is configuring a new Android tablet…
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?
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.
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
A low battery in a Bluetooth peripheral typically manifests as intermittent disconnections, failure to pair, or complete cessation of function due to insufficient power for the radio transceiver. While it could cause erratic behavior, slow typing with missed keystrokes, especially when other Bluetooth devices (like a scanner) function normally, is less indicative of a critically low battery and more suggestive of signal integrity issues. A device with a critically low battery often struggles to maintain a stable link rather than just dropping specific data packets.
- ✗
The tablet's Bluetooth driver is outdated
Why it's wrong here
An outdated or corrupted Bluetooth driver on the tablet would typically affect all Bluetooth peripheral connections, leading to general instability, pairing failures, or performance issues across multiple devices. Since the Bluetooth scanner is functioning perfectly without any reported issues, it strongly suggests the tablet's core Bluetooth stack and driver are operational and up-to-date enough to support standard device communication. The problem being specific to the keyboard points away from a system-wide driver fault.
- ✓
Interference from the rugged case or other wireless signals is degrading the keyboard's connection
Why this is correct
Rugged cases often incorporate dense materials, such as metal or thick plastic, which can attenuate or reflect 2.4 GHz Bluetooth radio signals, leading to reduced signal strength and increased packet loss. Additionally, other wireless signals in the 2.4 GHz ISM band (e.g., Wi-Fi, cordless phones, microwaves) can cause electromagnetic interference, degrading the keyboard's connection quality. The keyboard's smaller antenna or less robust radio might be more susceptible to these environmental factors than the scanner, resulting in missed keystrokes due to corrupted or dropped data packets.
- ✗
The keyboard is not compatible with Android
Why it's wrong here
If the Bluetooth keyboard successfully pairs with the Android tablet and initially connects, it demonstrates fundamental compatibility at the protocol level. Incompatibility would typically prevent pairing altogether, or result in the keyboard failing to register any input, not just intermittent missed keystrokes. The observed issue of slow typing with dropped inputs points to a performance or signal integrity problem after a successful connection has been established, rather than a basic lack of support for the Android operating system.
Go deeper
Related to this question
Learn chapter
Mobile Device Types and Features
Key term
CAN
A CAN (Controller Area Network) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer.
Key term
Tablet
A tablet is a portable computing device with a touchscreen interface, typically larger than a smartphone but smaller than a laptop, used for browsing, media consumption, and light productivity tasks.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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