A smart city is deploying a mobile app for citizens to report issues (e.g., potholes, broken streetlights). The app captures photos and location data and sends them to a cloud backend. The city wants to ensure that the app works reliably even when citizens are in areas with poor cellular connectivity. Which architecture best ensures reliable data submission?

The app stores data locally on the device and retries submission when connectivity is restored.

The app uses a peer-to-peer mesh network to relay data to other citizens' phones before reaching the cloud.

The app compresses the data to reduce the amount of data transmitted, but still requires a live connection.

The app sends data directly to the cloud in real-time and displays an error if the submission fails.

What is the primary benefit of using edge computing in conjunction with a mobile IoT app?

It reduces latency by processing data closer to the source

It eliminates the need for any cloud service

It increases the amount of data that must be sent to the cloud

It makes the mobile app work without any internet connection

A developer is building a mobile app that controls a smart thermostat via MQTT. They need to test the app's behavior when the thermostat goes offline, when the network is slow, and when the MQTT broker returns an error. They do not yet have physical access to the thermostat hardware. Which testing strategy is most appropriate at this stage?

Use a network throttling tool on the phone but do not simulate the broker or device

Use a local MQTT broker with a simulated thermostat that can be programmed to disconnect, delay, or reject messages

Test only on a real device with the actual thermostat, even if it means waiting for hardware

Skip testing until the hardware arrives, because simulation cannot accurately reflect real-world behavior

EC-CouncilIoT Security Essentials

Domain 3Objective 2

Mobile Applications ISE Practice Questions (Page 7)

Part of the IoT Advanced Topics domain, which makes up ~13% of our current practice bank. EC-Council does not publish an official question count, but from its 120-minute exam (~50–80 total, ~7–10 in this domain), expect 2–3 from this objective — we provide 44 practice questions to prepare you well beyond it. (estimate)

44questions here

9free pages

7concepts

Questions 31–35

31expert · hard
A smart city is deploying a mobile app for citizens to report issues (e.g., potholes, broken streetlights). The app captures photos and location data and sends them to a cloud backend. The city wants to ensure that the app works reliably even when citizens are in areas with poor cellular connectivity. Which architecture best ensures reliable data submission?
Select an answer first
32foundation · easy
What is the primary benefit of using edge computing in conjunction with a mobile IoT app?
Select an answer first
33application · medium
A developer is building a mobile app that controls a smart thermostat via MQTT. They need to test the app's behavior when the thermostat goes offline, when the network is slow, and when the MQTT broker returns an error. They do not yet have physical access to the thermostat hardware. Which testing strategy is most appropriate at this stage?
Select an answer first
34foundation · easy
Which communication protocol is specifically designed as a lightweight publish-subscribe messaging protocol for IoT devices with limited bandwidth and power?
Select an answer first
35foundation · easy
A mobile app needs to communicate with a nearby smart lock over a short range without using a Wi-Fi network. Which protocol is most appropriate for this direct, low-power connection?
Select an answer first

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Mobile Applications ISE Practice Questions (Page 7)

Questions 31–35

What is the primary benefit of using edge computing in conjunction with a mobile IoT app?

Which communication protocol is specifically designed as a lightweight publish-subscribe messaging protocol for IoT devices with limited bandwidth and power?

A mobile app needs to communicate with a nearby smart lock over a short range without using a Wi-Fi network. Which protocol is most appropriate for this direct, low-power connection?

Keep studying — IoT Advanced Topics