Native Applications ISE Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A developer is writing a native app for a smart lighting system that uses CoAP over UDP for control. The app must also support discovery of devices on the local network. Which protocol interaction is most appropriate?

   • AUse CoAP's built-in resource discovery (/.well-known/core) and multicast support to find devices.
   • BUse a hybrid web framework to abstract CoAP into a JavaScript API.
   • CUse HTTP GET requests to a central cloud server to discover devices.
   • DUse MQTT topics to broadcast device presence.
   Reveal Solution Discussion Select an answer first
2. 12expert · hard

   A developer is building a native app for a smart home hub that supports multiple IoT devices using different protocols (Zigbee, Z-Wave, and Wi-Fi). The app must provide a unified interface to control all devices. The developer is considering whether to use a native app or a hybrid web app. Which factor is most critical in this decision?

   • AHybrid web apps are more secure because they run in a sandboxed browser environment.
   • BNative apps can directly access the platform's network APIs to communicate with each protocol's stack, while hybrid web apps are limited to browser-supported protocols.
   • CNative apps are easier to update because they can be updated without app store approval.
   • DHybrid web apps have better performance for low-level protocol communication because they use JavaScript's event loop.
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   A developer is building a native iOS app that needs to send commands to a smart bulb over Wi-Fi using a custom TCP protocol. The app also needs to receive status updates from the bulb. The developer is considering using a WebSocket connection instead of raw TCP. What is the main advantage of using WebSocket for this IoT communication?

   • AWebSocket is easier to implement than raw TCP in iOS.
   • BWebSocket is more efficient than raw TCP because it uses less overhead.
   • CWebSocket allows the server (bulb) to push messages to the client without the client polling.
   • DWebSocket provides built-in encryption, eliminating the need for TLS.
   Reveal Solution Discussion Select an answer first
5. 14expert · hard

   A company is developing a native iOS app for a medical device that transmits patient data to a cloud server. The app must comply with data protection regulations that require encryption of data in transit and at rest. The app currently uses HTTPS for cloud communication but stores patient data in a local SQLite database without encryption. What should the developer do to protect data at rest?

   • AStore patient data in UserDefaults instead of SQLite.
   • BUse SQLCipher to encrypt the SQLite database.
   • CUse a cloud database and avoid storing data locally.
   • DRely on iOS's automatic file encryption, which encrypts all app data by default.
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6. 15application · easy

   An industrial IoT solution uses a native Android app to configure sensors on a factory floor. The app is distributed through a private enterprise app store. The security team requires that when a sensor is decommissioned, the app must remove all locally stored configuration data and revoke the sensor's API credentials. Which lifecycle stage does this requirement primarily address?

   • ARuntime initialization
   • BUpdate
   • CDecommissioning
   • DInstallation
   Reveal Solution Discussion Select an answer first