,WGU D337 Internet of Things (IoT) & Infrastructure
OA Final Exam | 2026/2027 Edition (PDF)
**1. The three-layer IoT architecture (basic) consists of which layers?**
A) Device, Gateway, Cloud
B) Edge, Fog, Cloud
C) Perception (sensors/actuators), Network (connectivity), Application (data processing/user interface)
D) Physical, Cyber, Social
Correct Answer: C) Perception (sensors/actuators), Network (connectivity), Application (data
processing/user interface)
Rationale: The three-layer model (Perception, Network, Application) is the foundational IoT architecture.
The Perception layer includes sensors and actuators that interact with the physical environment. The
Network layer provides connectivity. The Application layer handles data processing and user interfaces.
**2. The five-layer IoT architecture adds which two layers beyond the three-layer model?**
A) Middleware layer (service management) and Business layer (data analytics, decision making)
B) Security layer and Management layer
C) Transport layer and Session layer
D) Storage layer and Visualization layer
Correct Answer: A) Middleware layer (service management) and Business layer (data analytics, decision
making)
Rationale: The five-layer model consists of Perception, Network, Middleware, Application, and Business
layers. Middleware handles data management and service discovery, while the Business layer handles
analytics and decision support.
**3. Edge computing in IoT refers to which of the following?**
A) Storing all data in a centralized cloud data center
,B) Processing data near the source of data generation
C) Using blockchain to secure device communications
D) Transmitting data over satellite networks
Correct Answer: B) Processing data near the source of data generation
Rationale: Edge computing processes data at or near the source of data generation (e.g., IoT devices or
local gateways). This reduces latency, bandwidth usage, and reliance on centralized cloud servers.
**4. Which building block is used to move collected IoT data to the central IoT platform?**
A) Edge compute
B) Application
C) Gateway
D) Smart device
Correct Answer: C) Gateway
Rationale: The gateway acts as a bridge between IoT devices and the central IoT platform. It aggregates
data from sensors, performs protocol translation, and securely transmits data to the cloud or central
system.
**5. What is the function of soil moisture sensors in a smart agriculture ecosystem?**
A) Capturing soil moisture metrics
B) Processing soil moisture metrics
C) Activating sprinklers based on low-soil-moisture metrics
D) Transmitting soil moisture metrics to a central network
Correct Answer: A) Capturing soil moisture metrics
, Rationale: Sensors in an IoT ecosystem are responsible for capturing raw data from the physical
environment. Soil moisture sensors measure the water content in soil, providing the foundational data
for smart irrigation decisions.
**6. Which building block of IoT architecture is responsible for collecting raw data generated by the
monitored entity?**
A) Actuator
B) Gateway
C) Processor
D) Sensor
Correct Answer: D) Sensor
Rationale: Sensors are the data collection points in IoT architecture. They detect and measure physical
phenomena (temperature, moisture, motion, etc.) and convert them into electrical signals that can be
processed and transmitted.
**7. What moves data from IoT sensor devices to a central network or platform?**
A) Edge compute
B) Application
C) Gateway
D) Smart device
Correct Answer: C) Gateway
Rationale: The gateway serves as the intermediary between sensor devices and the central network. It
collects, aggregates, and forwards data from multiple sensors to the central platform, often performing
protocol translation and initial data processing.
**8. Which computation method processes data captured at the sensor device before sending it to a
backhaul network?**
A) Cloud computing
OA Final Exam | 2026/2027 Edition (PDF)
**1. The three-layer IoT architecture (basic) consists of which layers?**
A) Device, Gateway, Cloud
B) Edge, Fog, Cloud
C) Perception (sensors/actuators), Network (connectivity), Application (data processing/user interface)
D) Physical, Cyber, Social
Correct Answer: C) Perception (sensors/actuators), Network (connectivity), Application (data
processing/user interface)
Rationale: The three-layer model (Perception, Network, Application) is the foundational IoT architecture.
The Perception layer includes sensors and actuators that interact with the physical environment. The
Network layer provides connectivity. The Application layer handles data processing and user interfaces.
**2. The five-layer IoT architecture adds which two layers beyond the three-layer model?**
A) Middleware layer (service management) and Business layer (data analytics, decision making)
B) Security layer and Management layer
C) Transport layer and Session layer
D) Storage layer and Visualization layer
Correct Answer: A) Middleware layer (service management) and Business layer (data analytics, decision
making)
Rationale: The five-layer model consists of Perception, Network, Middleware, Application, and Business
layers. Middleware handles data management and service discovery, while the Business layer handles
analytics and decision support.
**3. Edge computing in IoT refers to which of the following?**
A) Storing all data in a centralized cloud data center
,B) Processing data near the source of data generation
C) Using blockchain to secure device communications
D) Transmitting data over satellite networks
Correct Answer: B) Processing data near the source of data generation
Rationale: Edge computing processes data at or near the source of data generation (e.g., IoT devices or
local gateways). This reduces latency, bandwidth usage, and reliance on centralized cloud servers.
**4. Which building block is used to move collected IoT data to the central IoT platform?**
A) Edge compute
B) Application
C) Gateway
D) Smart device
Correct Answer: C) Gateway
Rationale: The gateway acts as a bridge between IoT devices and the central IoT platform. It aggregates
data from sensors, performs protocol translation, and securely transmits data to the cloud or central
system.
**5. What is the function of soil moisture sensors in a smart agriculture ecosystem?**
A) Capturing soil moisture metrics
B) Processing soil moisture metrics
C) Activating sprinklers based on low-soil-moisture metrics
D) Transmitting soil moisture metrics to a central network
Correct Answer: A) Capturing soil moisture metrics
, Rationale: Sensors in an IoT ecosystem are responsible for capturing raw data from the physical
environment. Soil moisture sensors measure the water content in soil, providing the foundational data
for smart irrigation decisions.
**6. Which building block of IoT architecture is responsible for collecting raw data generated by the
monitored entity?**
A) Actuator
B) Gateway
C) Processor
D) Sensor
Correct Answer: D) Sensor
Rationale: Sensors are the data collection points in IoT architecture. They detect and measure physical
phenomena (temperature, moisture, motion, etc.) and convert them into electrical signals that can be
processed and transmitted.
**7. What moves data from IoT sensor devices to a central network or platform?**
A) Edge compute
B) Application
C) Gateway
D) Smart device
Correct Answer: C) Gateway
Rationale: The gateway serves as the intermediary between sensor devices and the central network. It
collects, aggregates, and forwards data from multiple sensors to the central platform, often performing
protocol translation and initial data processing.
**8. Which computation method processes data captured at the sensor device before sending it to a
backhaul network?**
A) Cloud computing
