Protocols and TCP/IP
Network protocols are rules that let devices communicate, with TCP/IP being the main internet protocol suite.
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Network protocols are rules that let devices communicate, with TCP/IP being the main internet protocol suite.
- TCP splits data into packets
- IP addresses route packets
- HTTP, FTP and SMTP are application protocols
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Protocols and TCP/IP?
Within Computer Science, which covers algorithms, programming, data, networks, hardware and safe, responsible use of technology, this topic explains Protocols and TCP/IP. Computing topics explain how software, hardware and data work, with diagrams and models that show each step in order.
Check that you can explain Protocols and TCP/IP in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Protocols and TCP/IP helps you design, test and explain programs, websites and systems, from small projects to exam questions.
Protocols and TCP/IP in detail
A protocol is a set of rules that devices follow to communicate. TCP/IP is the main set of protocols of the internet: IP handles addressing and routing of packets, and TCP breaks data into packets, numbers them, checks for errors and reassembles them in order, resending any lost.
Other protocols include HTTP and HTTPS (web pages), FTP (file transfer), SMTP, POP and IMAP (email) and UDP (faster, with no checking, used for streaming). The layered model, with application, transport, internet and link layers, splits tasks so that each layer works independently. Standards allow devices from different makers to communicate.
How the interactive helps you understand Protocols and TCP/IP
Watch the network in the interactive. Use any sliders or buttons it offers to change the values and see how the network responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Protocols and TCP/IP.
Real-life uses and examples
- Recognise Protocols and TCP/IP in an app or device you use every day.
- Apply Protocols and TCP/IP when you design a small program, website or spreadsheet.
- Explain Protocols and TCP/IP to someone new to computing by comparing it to a familiar process.
Common mistakes to avoid
- Using the term without being able to say what the computer actually does.
- Testing only the normal case and forgetting the edge cases.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Protocols and TCP/IP
What is Protocols and TCP/IP?
Network protocols are rules that let devices communicate, with TCP/IP being the main internet protocol suite.
What are the most important points about Protocols and TCP/IP?
The main points are: TCP splits data into packets; IP addresses route packets; HTTP, FTP and SMTP are application protocols.
Why is Protocols and TCP/IP useful?
Understanding Protocols and TCP/IP helps you design, test and explain programs, websites and systems, from small projects to exam questions.
How can I practise Protocols and TCP/IP?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Protocols and TCP/IP?
Related topics in Computer Science include Wireless and Mobile Networks, Protecting Data and Passwords, Online Safety.