The correct answer is: A. TCP/IP
TCP/IP (Transmission Control Protocol/Internet Protocol) is a set of protocols that allow computers to communicate with each other over a network. It is the most widely used protocol in the world, and it is the foundation of the Internet.
TCP/IP is a layered protocol, which means that it is made up of a number of different layers, each of which performs a specific function. The layers are:
- Application layer: This layer is responsible for the applications that use the network, such as web browsers, email clients, and file sharing programs.
- Transport layer: This layer is responsible for ensuring that data is delivered reliably from one computer to another.
- Internet layer: This layer is responsible for routing data through the network.
- Network access layer: This layer is responsible for communicating with the physical network, such as a wired or wireless network.
TCP/IP is a very robust and reliable protocol, and it is well-suited for the needs of the IoT. It is able to handle a large number of devices, and it can be used to connect devices over a variety of different networks, including wired and wireless networks.
The other options are incorrect because they are not protocols that are used to link all the devices in the IoT.
- Option B, network, is a general term that refers to a group of connected computers. It does not specify a particular protocol.
- Option C, UDP, is a User Datagram Protocol. It is a connectionless protocol, which means that it does not guarantee that data will be delivered reliably.
- Option D, HTTP, is the Hypertext Transfer Protocol. It is a protocol that is used to transfer data between web servers and web browsers.