GCSE Computer Science Revision — Networks & Protocols
Revise Networks & Protocols for GCSE Computer Science with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Networks & Protocols?
A computer network connects two or more devices so they can share resources and data. Protocols are the rules that govern how data is transmitted over a network. Key protocols for GCSE include TCP/IP (for reliable communication over the internet), HTTP/HTTPS (for web pages), FTP (for file transfer), and SMTP/IMAP (for email).
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The concept of layers is important, as are the functions of the main protocols (TCP/IP, HTTP, FTP, SMTP, IMAP).
Step-by-step explanationWorked examples
Worked example
When you type a web address into your browser, your computer (the client) sends an HTTP request to the web server's IP address. The request is broken into packets and sent via TCP/IP. The server receives the request, finds the requested web page, and sends it back to your browser in packets, which are reassembled using TCP.
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Common mistakes
- 1Confusing the internet with the World Wide Web. The internet is the global network of computers, while the WWW is the system of web pages and browsers that runs on it.
- 2Mixing up IP addresses and MAC addresses. An IP address is a logical address that can change, assigned to a device on a network. A MAC address is a unique, physical address burned into the network card.
- 3Not understanding the client-server model. A client (like your web browser) requests services from a server (which hosts the website).
Networks & Protocols exam questions
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Frequently asked questions
What is the TCP/IP model GCSE?
The TCP/IP model is a four-layer conceptual model for network communication. The layers are Application, Transport, Internet, and Network Access. It provides a standardized way for computers to communicate over a network.
What is the difference between HTTP and HTTPS?
HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP. It encrypts the data sent between your browser and the website, making it safe from eavesdroppers. You can tell a site is using HTTPS if the URL starts with 'https' and has a padlock icon.