A company uses webhooks to notify a third-party service when IoT devices report anomalies. The webhook endpoint occasionally times out, and the company wants to ensure no events are lost. Which approach should be implemented?

Send the webhook synchronously and block the device until it succeeds

Implement a retry mechanism with exponential backoff and store failed events in a queue

Increase the webhook timeout to 60 seconds

Use a polling mechanism instead of webhooks

What is the primary purpose of a webhook in an IoT system?

To encrypt all data transmitted between the IoT device and the cloud

To allow a web service to poll the IoT device for updates at regular intervals

To enable an IoT device to send an HTTP request to a predefined URL when a specific event occurs

To establish a persistent two-way communication channel between the device and server

A company manages thousands of industrial sensors across multiple sites. They need a web-based dashboard that allows technicians to view real-time status and remotely reboot devices. Which architecture best supports this requirement?

Each sensor exposes a public HTTPS endpoint for direct browser access

Technicians use SSH to each sensor from the dashboard

Sensors send email alerts and the dashboard only displays historical data

Sensors connect to a central management server via MQTT, and the dashboard uses a REST API to send commands

An IoT platform must support both real-time bidirectional device control and occasional firmware updates. The devices are behind NAT and have limited bandwidth. The team is considering WebSocket and MQTT over WebSockets. Which factor is most important when choosing between these two?

MQTT over WebSockets provides publish/subscribe semantics and QoS levels

WebSocket is simpler to implement on the device

MQTT over WebSockets is more secure than WebSocket

WebSocket has lower overhead than MQTT over WebSockets

EC-CouncilIoT Security Essentials

Domain 3Objective 1

Web Communications ISE Practice Questions (Page 2)

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 43 practice questions to prepare you well beyond it. (estimate)

43questions here

9free pages

6concepts

Questions 6–10

6expert · hard
A company uses webhooks to notify a third-party service when IoT devices report anomalies. The webhook endpoint occasionally times out, and the company wants to ensure no events are lost. Which approach should be implemented?
Select an answer first
7foundation · easy
What is the primary purpose of a webhook in an IoT system?
Select an answer first
8foundation · easy
Which data format is widely used in IoT web communications because it is lightweight, human-readable, and natively supported by JavaScript, making it ideal for browser-based applications?
Select an answer first
9application · medium
A company manages thousands of industrial sensors across multiple sites. They need a web-based dashboard that allows technicians to view real-time status and remotely reboot devices. Which architecture best supports this requirement?
Select an answer first
10expert · hard
An IoT platform must support both real-time bidirectional device control and occasional firmware updates. The devices are behind NAT and have limited bandwidth. The team is considering WebSocket and MQTT over WebSockets. Which factor is most important when choosing between these two?
Select an answer first

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