CMT CMT Mobile OS & Application Management 2 — Questions and Answers
Question 1: What is the function of Android Debug Bridge (ADB)?
- A command-line tool that allows communication between a PC and an Android device for diagnostics and control (Correct answer)
- A tool for flashing iOS firmware
- An app store alternative for Android
- A battery calibration utility
Correct answer: A command-line tool that allows communication between a PC and an Android device for diagnostics and control
ADB enables technicians to install apps, pull logs, flash partitions, and issue shell commands from a computer.
Question 2: Which iOS tool is used to restore a device to factory firmware from a computer?
- iTunes (Windows) or Finder (macOS) (Correct answer)
- iCloud only
- ADB
- Samsung Smart Switch
Correct answer: iTunes (Windows) or Finder (macOS)
iTunes on Windows and Finder on macOS are the official tools for restoring iOS devices via USB.
Question 3: A customer's iPhone is stuck in a boot loop. Which recovery mode allows firmware restoration without erasing data if possible?
- Recovery Mode (DFU mode erases; Recovery Mode attempts to preserve data during a restore) (Correct answer)
- DFU Mode preserves data
- Safe Mode restores firmware
- iCloud backup mode
Correct answer: Recovery Mode (DFU mode erases; Recovery Mode attempts to preserve data during a restore)
Recovery Mode attempts a restore that may preserve user data, while DFU Mode performs a complete firmware flash.
Question 4: What is the significance of a device's build number in Android?
- It identifies the specific firmware version installed, critical for applying correct updates or patches (Correct answer)
- It shows the battery health percentage
- It is the device's unique hardware ID
- It indicates carrier unlock status
Correct answer: It identifies the specific firmware version installed, critical for applying correct updates or patches
The build number pinpoints the exact OS version and patch level, essential for targeted troubleshooting.
Question 5: What does 'cache partition wipe' accomplish on Android?
- It clears temporary system files that can cause glitches without deleting user data (Correct answer)
- It removes all user apps and data
- It resets network settings
- It unlinks the Google account
Correct answer: It clears temporary system files that can cause glitches without deleting user data
Wiping the cache partition removes corrupted temp files and often resolves post-update performance issues.
Question 6: Why should technicians be cautious when disabling system apps on Android?
- Disabling critical system apps can cause instability, crashes, or loss of essential device functions (Correct answer)
- It voids the physical warranty only
- System apps cannot be disabled on any Android device
- It permanently deletes the apps from all devices on the account
Correct answer: Disabling critical system apps can cause instability, crashes, or loss of essential device functions
Some system apps are dependencies for other services; disabling them can break core functionality.
CMT CMT Mobile OS & Application Management 2
What is the function of Android Debug Bridge (ADB)?