Unit 2: Introduction to IoT - Practice Quiz

1 What does the term Internet of Things (IoT) mainly describe?

2 Which device is commonly used to measure temperature in an IoT system?

3 Which layer of a basic IoT architecture usually contains sensors and actuators?

4 What is the main purpose of protocols in IoT systems?

5 What is the primary responsibility of the network layer?

6 Which protocol is widely used at the network layer for Internet communication?

7 What does an IP address identify in a network?

8 What is a main function of the transport layer?

9 Which transport protocol provides reliable, connection-oriented communication?

10 Which transport protocol is generally connectionless and has lower overhead?

11 Which layer provides services directly to IoT applications?

12 Which protocol is commonly used for lightweight publish-subscribe messaging in IoT?

13 In MQTT, what is the role of a broker?

14 Which component collects information from the physical environment?

15 Which component performs an action based on an IoT system command?

16 What is a typical purpose of an IoT platform?

17 Which is an example of a smart home IoT application?

18 Which issue is a common security challenge in IoT?

19 What does 6LoWPAN enable for low-power wireless networks?

20 What is the main purpose of CoSIP in constrained IoT communication?

21 A smart irrigation system measures soil moisture and automatically opens a water valve when moisture falls below a threshold. Which IoT characteristic is most directly demonstrated?

22 In a layered IoT architecture, which layer most commonly converts sensor readings into user-facing dashboards and business actions?

23 A sensor node must send data to a cloud server through several intermediate routers. What is the primary network-layer responsibility in this scenario?

24 An IoT device sends occasional temperature updates where low overhead is more important than guaranteed delivery. Which transport protocol is generally the better fit?

25 A remote firmware update must arrive completely and in the correct order. Which transport-layer feature is most important?

26 A building-management system needs lightweight request-response communication between constrained devices and a gateway. Which application protocol is designed for this use case?

27 A fleet-monitoring platform must distribute one alert to many subscribed vehicle applications. Which messaging pattern is most suitable?

28 Which protocol stack is most appropriate for a constrained IPv6 sensor network that uses lightweight REST-style communication?

29 Why is header compression important in a 6LoWPAN network using IEEE 802.15.4 frames?

30 An IPv6 packet is larger than the maximum payload that an IEEE 802.15.4 frame can carry. Which 6LoWPAN function addresses this problem?

31 A battery-powered environmental sensor must transmit a few bytes every hour over several kilometers. Which communication technology is generally most suitable?

32 What is the main role of an IoT gateway in a deployment containing local sensors and a cloud platform?

33 A company wants managed device registration, telemetry ingestion, rules processing, and integration with cloud analytics. What is the key benefit of using an IoT cloud platform?

34 Which platform capability is most useful when an administrator must remotely change reporting intervals on thousands of deployed devices?

35 In a cold-chain logistics system, which event most appropriately requires a real-time IoT alert?

36 A manufacturer discovers that deployed sensors still use default passwords. Which IoT challenge is most directly exposed?

37 Two smart-home devices use different proprietary data formats and cannot exchange status information without a custom converter. This is primarily an example of:

38 In an IoT protocol specification, which section should define the required fields and allowed values of a protocol message?

39 A CoSIP implementation receives a message with a mandatory field missing. What should a well-defined protocol specification require?

40 Why is IPv6 particularly valuable for large-scale IoT deployments?

41 A battery-powered IPv6 sensor must send a measurement through several low-power wireless hops. Which network-layer design most directly preserves end-to-end IPv6 semantics while allowing routing decisions to account for unstable links?

42 An IPv6 IoT deployment has a path MTU of 80 bytes on a constrained wireless link, but applications generate 200-byte datagrams. Which behavior is most appropriate when fragmentation is unavoidable?

43 A telemetry device must deliver small updates with low overhead, tolerate occasional loss, and avoid maintaining a connection to every receiver. Which transport choice best matches these requirements?

44 A CoAP client sends a confirmable request, but the server response is delayed beyond the retransmission timeout. The original request may have reached the server. Which design prevents duplicate actuator actions?

45 A constrained device exposes a resource whose state changes frequently. A client wants to minimize polling while still learning about changes. Which application-layer mechanism is most suitable?

46 An IoT gateway must expose a temperature resource to both constrained nodes and conventional web clients. Which architectural choice gives the best protocol interoperability?

47 A system connects sensors to a cloud dashboard but cannot execute local control when the Internet connection fails. Which IoT capability is most clearly missing?

48 A smart-building platform combines occupancy readings, HVAC control, and energy billing data. What makes this an IoT system rather than an isolated sensor network?

49 A design places sensing and actuation at the device layer, protocol translation at gateways, analytics in the cloud, and business rules in services. Which concern is best addressed by this layered architecture?

50 A factory uses MQTT for telemetry, CoAP for constrained device control, and IPv6 for addressing. Which statement best describes their architectural relationship?

51 A platform must support device provisioning, telemetry ingestion, digital-twin state, rules, and over-the-air updates across vendors. Which evaluation criterion is most important?

52 An organization wants to avoid vendor lock-in while retaining cloud analytics. Which platform strategy provides the strongest architectural protection?

53 A remote patient monitor must detect a dangerous cardiac event even when cloud connectivity is interrupted. Which implementation provides the most appropriate behavior?

54 A warehouse needs inexpensive battery tags, room-level localization, and occasional gateway communication. Which technology combination is the most defensible?

55 A utility deploys low-bandwidth sensors over a wide rural area, requiring years of battery life and infrequent uplinks. Which trade-off is most acceptable?

56 A manufacturer ships thousands of IoT devices with identical permanent passwords. Which risk is most severe if one password is extracted?

57 A battery sensor spends more energy retransmitting packets than measuring data because acknowledgments are frequently lost. Which intervention most directly addresses the problem?

58 Why is 6LoWPAN header compression especially valuable on IEEE 802.15.4 networks?

59 An IPv6 packet exceeds the payload capacity of a single IEEE 802.15.4 frame. Which 6LoWPAN function allows the packet to traverse the constrained link?

60 A 6LoWPAN node receives fragments from two datagrams with overlapping fragment tags and similar timing. Which field combination is needed to distinguish reassembly contexts?