Mobile Applications ISE Practice Questions (Page 8)

Questions 36–40

1. 36application · medium

   A wearable fitness tracker manufacturer is designing a mobile app that shows real-time heart rate and step count. The tracker communicates with the phone via Bluetooth Low Energy (BLE). The app also uploads historical data to a cloud service for long-term analytics. Which architectural pattern best describes this setup?

   • AThe phone and tracker form a mesh network that connects to the cloud without a gateway
   • BThe tracker connects directly to the cloud via Wi-Fi, and the phone is only a display
   • CThe phone acts as a gateway between the BLE device and the cloud, aggregating and forwarding data
   • DThe cloud sends commands directly to the tracker via BLE, bypassing the phone
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2. 37application · medium

   A wearable health monitor manufacturer is developing a mobile app that collects sensitive patient data from a Bluetooth-enabled device and transmits it to a cloud backend. The app must comply with healthcare regulations that require data to be encrypted both in transit and at rest. Which combination of security measures should the development team implement?

   • AUse a custom encryption algorithm for cloud communication and store data in plaintext locally.
   • BUse Bluetooth's built-in encryption and rely on the cloud provider's default encryption for stored data.
   • CUse TLS for cloud communication and encrypt the local database with a key derived from the user's passphrase.
   • DUse HTTPS for cloud communication and rely on the operating system's file-level encryption for local storage.
   Reveal Solution Discussion Select an answer first
4. 38expert · hard

   A company sells a smart door lock that is already deployed in thousands of homes. They discover a critical vulnerability in the lock's firmware that could allow unauthorized unlocking. The fix requires both a firmware update to the lock and an update to the mobile app to support the new firmware's authentication handshake. The company wants to minimize the window of exposure while ensuring that the update process does not fail on a large scale. Which rollout strategy is most appropriate?

   • AForce-update the mobile app immediately, then push the firmware update to all locks at once
   • BDo not update the firmware; instead, add a server-side check to block unauthorized unlock attempts
   • CRelease the firmware update only, and tell users to reinstall the app if it stops working
   • DPush the firmware update to a small pilot group first, monitor for failures, then gradually expand while also updating the app
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5. 39expert · hard

   A team is developing a mobile app that controls a fleet of drones. The app communicates with the drones via a custom protocol over Wi-Fi. The team needs to test the app's behavior in various scenarios, including signal loss, GPS failure, and low battery. The drones are expensive and cannot be used for all tests. Which testing strategy is most effective?

   • AUse only real-device testing with the actual drones to ensure the most accurate results.
   • BUse only software simulation to test the app's logic, without any hardware interaction.
   • CUse a combination of hardware-in-the-loop (HIL) simulation and real-device testing for critical scenarios.
   • DUse a network simulator to test the app's behavior under various network conditions, but do not test the drone's response.
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6. 40application · medium

   A team is developing a mobile app that controls a smart thermostat. The app communicates with the thermostat via Wi-Fi and MQTT. The team wants to test the app's behavior when the thermostat is offline or unresponsive. Which testing approach is most appropriate for this scenario?

   • AUse a mock MQTT broker that simulates the thermostat's responses and can be configured to simulate offline or unresponsive states.
   • BUse a network simulator to introduce packet loss and observe the app's behavior.
   • CDisconnect the physical thermostat from the Wi-Fi network and observe the app's behavior.
   • DPerform unit testing on the app's UI components without testing the MQTT communication layer.
   Reveal Solution Discussion Select an answer first