TCP/IP is an acronym for Transmission Control Protocol/Internet Protocol, which is practically the reason why the Internet works. These protocols let computers communicate with one another over the Web.
Transmission Control Protocol (TCP) takes enormous amounts of data, compiles them into network packets (i.e., the units of data transmitted over the Internet), and sends them to another computer’s TCP. Think of TCP as the Internet’s “delivery man,” and the “package” he delivers is the data in the form of packets.
Internet Protocol (IP), on the other hand, is the delivery man’s Global Positioning System (GPS). It ensures that the right locations (i.e., computers or devices) receive the network packets.
Because of TCP/IP, people from Europe can check what’s happening on the other side of the world, and vice versa.
Read More about “TCP/IP”
You may encounter some technology experts referring to TCP/IP as the Internet protocol suite, and that is true. The Internet protocol suite is made up of other communication protocols besides TCP and IP. However, since they were the first two protocols developed to make the Internet work, the Internet protocol suite came to be known as “TCP/IP.”
The TCP/IP model has four layers—the link layer, the Internet layer, the transport layer, and the application layer, all of which work together to transmit data over the Internet successfully.
Brief History of the TCP/IP Protocol Suite
The U.S. Department of Defense was responsible for developing the model in the 1970s through the Defense Advanced Research Projects Agency (DARPA). The DARPA scientists who designed the model were Vint Cerf and Bob Kahn. The ARPANET, the earliest version of the Internet, was the first to use the protocols. As such, Cerf and Kahn are considered the “fathers of the Internet.”
At present, the Internet Engineering Task Force (IETF) manages TCP/IP and the rest of the components of the Internet protocol suite.
How Does TCP/IP Work?
TCP/IP connections are divided into four layers of a standard process, regardless of hardware or software used. Getting to know these layers is the key to understanding how does TCP/IP work. The four layers are:
- Application layer: This refers to any program that exchanges information. If you’re reading this article on Google Chrome, then you’re on this layer. An application layer could refer to a browser, a server, an application, or any platform whose job is to send files and information to the transport layer.
- Transport (TCP) layer: This layer’s primary purpose is to figure out how the information from the application layer should be sent to the destination. In it, the data is broken down into network packets.
- Internet (IP) layer: After the information is converted into packets, it is sent to the IP layer. This layer is tasked to assign an IP address to each network packet so it can be sent to the exact location of a specific network. The IP layer then sends the packets to the correct destination through the network interface.
- Network interface: This is also known as the “data link layer (DLL),” “link layer,” or “physical layer.” Whatever term you use, this layer handles the data’s movement from sender to receiver through a wireless network, an Ethernet cable, and other physical parts that allow information to travel.
To better understand how does TCP/IP work, watch the video below that likens TCP/IP to sending a puzzle to a friend.
Features of TCP/IP
The model has become the industry standard because it has features that make connectivity possible. Among its features are:
1. It is interoperable.
Almost all operating systems (OSs) have TCP/IP support. So it doesn’t matter if you’re using a Windows computer and accessing files from a server that runs on Linux or vice-versa, communication between the two different OSs will still work.
2. A single vendor does not control it.
Since no single organization owns the model, anyone can implement it in its products, be it hardware or software.
3. It is routable.
Because TCP/IP is routable, it allows the transport of packets of data from one network to another.
4. It has error and flow control features.
The model can check for any transmission error and resend data when an error is detected. This feature ensures the reliability and accuracy of the data transmitted.
5. It supports different applications.
One computer may be running various network applications, so TCP/IP makes sure that the right packets reach the correct application. Ports and port numbers that identify which parts of hardware devices an application (i.e., the data’s intended recipient) should be connected to make this possible.