Which IoT Layer Holds Sensors and RFID Tags?

312-49v10 By islever Editorial Last updated

IoT Forensics

Short answer

C The edge technology layer comprises the sensors, RFID tags, and devices responsible for data collection in the IoT architecture.

Question

Which layer in the IoT architecture is comprised of hardware parts such as sensors, RFID tags, and devices that play an important role in data collection?
  1. Access gateway layer
  2. Application layer
  3. Edge technology layer Correct Answer
  4. Middleware layer

Key Takeaways

The question tests which IoT architecture layer performs physical data collection, and the trap is confusing hardware-bearing layers with processing or connectivity layers like middleware or access gateways.

In IoT architecture, the edge technology layer is the hardware tier made up of sensors, RFID tags, readers, and devices that physically collect data from the environment. This page confirms option C as the correct layer for data collection hardware and explains why the other layers do not fit.

Common mistake: Option D, the middleware layer, is the most tempting wrong choice because middleware also connects devices to servers and networks, but it handles software-based data processing and abstraction rather than the physical sensors and RFID tags themselves.

Expert Analysis

Why the Answer Is Correct

Option C, the edge technology layer, is the hardware tier of the IoT stack. It comprises physical parts such as sensors, RFID tags, readers or other soft sensors, and the device itself, all of which directly gather data from the environment before that data is processed and forwarded. As community comments confirm, this layer "plays an important role in data collection" and connects devices within the network to the server. Since the question explicitly names sensors, RFID tags, and devices, C is the only option that matches those components.

Why the Other Options Are Wrong

Option A, the access gateway layer, is a connectivity component that routes traffic between the edge and upper layers; it does not itself contain the sensing hardware that collects data. Option B, the application layer, delivers user-facing services and analytics on data that has already been collected, so it sits at the top of the stack rather than at the data-collection point. Option D, the middleware layer, provides software abstraction, device management, and message brokering between devices and applications — important for transport and processing, but it is not the physical sensor hardware tier.

Community Comment Notes

Every recorded vote and comment selected C, with Elb quoting that the layer "consists of all hardware parts, such as sensors, RFID tags, readers or other soft sensors". aqeel1506 likewise explained that this layer "includes the physical devices and sensors that gather data from the environment". Elb also cited the AWS IoT Lens edge layer documentation as supporting material, and the community consensus aligns with the independent analysis here.

Official Reference

https://docs.aws.amazon.com/wellarchitected/latest/iot-lens/edge-layer.html

This link opens the official vendor documentation in a new tab.

Exam Strategy

When an IoT architecture question names physical components like sensors or RFID tags, immediately think edge/perception layer, since hardware terminology maps to the bottom layer while software and service terms map upward. Eliminate options describing routing, brokering, or user-facing features before deciding.

Frequently Asked Questions

Why isn't the middleware layer the one collecting data with sensors and RFID tags?

Middleware is software that processes, routes, and abstracts data between devices and applications. It does not physically contain the sensors or RFID tags that acquire data from the environment.

How does the edge technology layer differ from the access gateway layer?

The edge technology layer holds the physical sensing hardware, while the access gateway layer provides network connectivity and routing that carries collected data toward the server and upper layers.

More 312-49v10 FAQ →

Community Votes

C
100%

100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 5 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 5

  1. Elb 👍 2 Answered C
    This layer consists of all hardware parts, such as sensors, RFID tags, readers or other soft sensors, and the device itself. T
  2. jingu_bingo 👍 2 Answered C
    All hardware stuff is at the Edge Technology Layer. One must be HARD while edging, and edging is HARD.
  3. aqeel1506 👍 1
    C. Edge technology layer This layer includes the physical devices and sensors that gather data from the environment, which is then processed and transmitted to other layers in the IoT architecture.
  4. Elb 👍 1
    This layer plays an important role in data collection, along with connecting devices within the network, and with the server
  5. Elb 👍 1
    C < https://docs.aws.amazon.com/wellarchitected/latest/iot-lens/edge-layer.html

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