{"id":74379,"date":"2022-12-24T11:32:59","date_gmt":"2022-12-24T11:32:59","guid":{"rendered":"\/tutorials\/?p=74379"},"modified":"2026-03-09T19:18:14","modified_gmt":"2026-03-09T19:18:14","slug":"tcp-protocol","status":"publish","type":"post","link":"\/ng\/tutorials\/tcp-protocol\/","title":{"rendered":"TCP protocol: understanding what transmission control protocol is and how it works"},"content":{"rendered":"

Transmission Control Protocol (TCP) is the default data communication method between different devices over a network. It establishes and maintains a connection between the sender and the receiver during the transferring process.<\/p>

With its mechanisms, TCP ensures that all packet data arrive unaltered. Moreover, it offers seamless and reliable transmission across various devices. It is used for email services and peer-to-peer sharing methods such as Secure Shell (SSH) and File Transfer Protocol (FTP).<\/p>

This article will cover everything you need to know about TCP, how it works, and the differences between the stack and OSI models. Finally, we will compare the standard method and the User Datagram Protocol (UDP).<\/p>

Download glossary for web beginners<\/a><\/p>

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\n What Is TCP?\n <\/p>\n <\/div>\n

TCP stands for Transmission Control Protocol and is used for transmitting data across networks. It breaks down the information into packets before sending them to the destination. With its advanced features, TCP offers a more reliable delivery system compared to other protocols.<\/p><\/div>\n\n\n\n<\/p>

How TCP Works<\/h2>
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TCP breaks down data into packets and forwards them to the internet protocol (IP) layer to ensure each message reaches its destination computer. This helps prevent issues and maintain efficiency during the process.<\/p>

Packets may travel along multiple routes if the actual path is congested or unavailable. Doing so will improve the network performance.<\/p>

The internet protocol splits communication tasks into several layers, keeping the transmission process standardized. All packets will pass through at least four layers before reaching their destination.<\/p>

The IP uses a three-way handshake method when creating the connection to ensure it can transfer several sockets in both directions concurrently.<\/p>

However, the device and server must synchronize and acknowledge the packets before negotiating, separating, and transmitting the TCP sockets.<\/p>

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\n Suggested Reading <\/p>\n <\/div>\n

IPv4 vs IPv6 – The Internet Protocol Comparison<\/a><\/p>\n <\/div>\n \n\n\n\n<\/p>

Then, TCP will go through the layers and reassemble the packets. Finally, the protocol will transmit the data to the receiving application.<\/p>

During the process, TCP arranges the segment numbering system, handles lost packets, and manages flow control.<\/p>

Why TCP Is Important<\/h2>

This high-level protocol is a core element in establishing regulations and standards for data transfers between multiple programs over networks. For web access, HTTP and HTTPS<\/a> rely on the TCP connection.<\/p>

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\n Suggested Reading <\/p>\n <\/div>\n

What Is SSL? Understanding Secure Sockets Layer and How It Works<\/a><\/p>\n <\/div>\n \n\n\n\n<\/p>

As a reliable protocol, it ensures communication occurs consistently, regardless of the devices and locations. Furthermore, it protects data delivery with advanced controls, such as acknowledgments and congestion avoidance mechanisms.<\/p>

Aside from being non-proprietary, TCP also allows and accommodates new protocols.<\/p>

The TCP Stack Model<\/h2>

The TCP stack model contains four layers:<\/p>