1.4 - Mobile connectivity: hotspot, tethering, Bluetooth and NFC
CompTIA A+ Core 1 objective 1.4 covers mobile network connectivity and pairing. When there is no Wi-Fi, a traveler can get a laptop online using their phone's cellular data through a mobile hotspot, also called tethering. To share that cellular data with a laptop over a cable, USB tethering is the feature to enable. Bluetooth is the short-range wireless technology that pairs headphones, keyboards and speakers, while NFC is the very short-range technology used for contactless payments by tapping. You should tell these connection methods apart by range and use. Expect scenario questions that describe a connectivity need - get online with no Wi-Fi, share data over USB, pair a peripheral, tap to pay - and ask which method or feature applies.
Get online via phone's cellular = mobile hotspot / tethering. Share data over a cable = USB tethering. Pair peripherals = Bluetooth. Tap to pay = NFC.
Practice questions
1. Which feature quickly disables all wireless radios on a phone?
- Do Not Disturb
- Battery saver
- Airplane mode (correct answer)
- Hotspot
Airplane mode turns off cellular, Wi-Fi and Bluetooth at once (you can re-enable Wi-Fi/BT after).
2. A phone won't make calls but Wi-Fi works. Which is the MOST likely cause?
- A cracked or damaged display glass
- No cellular signal or a SIM/carrier issue (correct answer)
- Very low remaining internal storage space
- The Bluetooth radio has been switched off
Calls use the cellular network; if Wi-Fi works but calls fail, suspect signal, the SIM/eSIM, or the carrier.
3. A user wants contacts and photos available on both their phone and laptop automatically. Which method is BEST?
- Email the files to himself
- Cloud account synchronization (correct answer)
- Bluetooth transfer each time
- Print the items on paper
A cloud account (e.g., iCloud, Google) syncs contacts/photos across devices automatically.
4. Which sensor lets a phone show your position on a map?
- Accelerometer
- Barometer
- GPS (correct answer)
- Gyroscope
GPS provides geolocation. The accelerometer/gyroscope handle motion/orientation, not position.
5. An organization allows employees to use personal phones for work email. IT must enforce encryption and remote wipe WITHOUT controlling the whole device. Which solution BEST fits this BYOD scenario?
- An MDM solution using app containerization (correct answer)
- A firewall rule blocking personal traffic
- Full device enrollment with a corporate wipe
- A dedicated corporate SIM in each phone
MDM with containerization separates corporate data into a managed container that IT can encrypt and remotely wipe, while leaving the employee's personal data untouched — ideal for BYOD.
6. A company-owned phone is lost. Which MDM capability protects the corporate data on it?
- Enforce a screen-lock PIN
- Remote wipe (correct answer)
- Require a longer password
- Disable the app store
MDM remote wipe erases corporate data (or the whole device) remotely so a lost phone doesn't leak data.