**3.1 Sensing layer**

It is also called the perception layer. All the hardware integration has been done in this layer. In traditional internet, this layer is equivalent to the physical layer. It senses and collects data from physical devices. The data can be temperature, humidity, presence or absence of some observable, etc.

#### **Figure 2.** *Internet of things architecture in 5G network.*

*Lightweight Cryptographic Techniques in 5G Software-Defined Internet of Things Networking DOI: http://dx.doi.org/10.5772/intechopen.102984*

#### **3.2 Network layer**

It is also called the transport layer. It acts as a bridge between the sensing layer and the application layer. It transmits the data collected from the sensing layer and sends it to the application layer based on applications requirements. The network layer can be wired or wireless, sometimes both wired and wireless networks can together make an IoT network. This layer is responsible for receiving instructions from the controller.

#### **3.3 Application layer**

This is the last layer of abstraction in the IoT network. It receives data comes from the networks layer and based on this; it provides service. The applications can be a smart home, smart cities, smart vehicular network, security, and surveillance of a building.
