Mobile Applications ISE Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   An IoT startup has released a mobile app that controls a smart lock. After a security audit, they must push a critical firmware update to the lock and a new version of the mobile app. The team wants to minimize the risk of bricking the lock and ensure that users actually install the app update. Which approach should they take?

   • ARelease the app update first, then roll out the firmware update gradually to a small percentage of devices
   • BOnly update the firmware and do not change the app, since the app already works
   • CPush the firmware update to all devices immediately, then release the app update
   • DRelease both updates simultaneously without any staging
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   Which component in an IoT architecture typically acts as an intermediary between mobile apps and constrained IoT devices that cannot directly support IP networking?

   • ACloud database
   • BMobile app itself
   • CNetwork router
   • DEdge gateway
   Reveal Solution Discussion Select an answer first
4. 28foundation · easy

   Which practice is essential for securing communication between a mobile app and an IoT device or cloud backend?

   • AEncrypting data in transit using TLS/SSL
   • BUsing plain HTTP for all requests to reduce latency
   • CStoring API keys in plain text within the app code
   • DDisabling authentication to simplify the user experience
   Reveal Solution Discussion Select an answer first
5. 29expert · hard

   A building management company is deploying a mobile app for facility managers to control HVAC and lighting in multiple buildings. Each building has an on-premises edge gateway that aggregates sensor data and executes control commands. The company wants the app to provide a unified view across all buildings, but also wants to minimize cloud bandwidth and ensure that control commands are executed even if the cloud is unreachable. Which architecture best meets these goals?

   • AApp connects directly to each edge gateway over the internet, bypassing the cloud entirely
   • BApp connects only to the cloud, and all commands are sent to gateways through the cloud
   • CApp uses a peer-to-peer mesh between phones and gateways, with no cloud component
   • DApp connects to a cloud service that aggregates data from all gateways, while each gateway can execute local commands independently
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A smart-home vendor is building a mobile app that must let users control Wi-Fi-enabled bulbs both when they are on the same LAN and when they are away from home. The bulbs have no internet connectivity of their own; they connect to a local hub. The vendor wants to minimize cloud latency for local commands while still supporting remote access. Which communication approach should the app use?

   • AUse local HTTP/REST calls to the hub when on the same LAN, and MQTT over TLS through the cloud when remote
   • BAlways route commands through the cloud MQTT broker, even when the phone is on the same LAN
   • CUse Bluetooth Low Energy (BLE) to talk directly to each bulb, bypassing the hub entirely
   • DUse CoAP with DTLS to the hub for both local and remote traffic, relying on the hub to forward CoAP over the internet
   Reveal Solution Discussion Select an answer first