What are network protocols, what are the common ones, and why are protocols arranged in layers?
The purpose of protocols, common protocols (TCP/IP, HTTP and HTTPS, FTP, SMTP), and why network communication is organised into layers.
A focused answer to the WJEC GCSE Computer Science Unit 1 content on protocols and layers, covering what a protocol is and why protocols are needed, the purpose of common protocols such as TCP/IP, HTTP and HTTPS, FTP and SMTP, and why network communication is split into layers.
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What this topic is asking
WJEC wants you to know what a protocol is, the purpose of common protocols (TCP/IP, HTTP and HTTPS, FTP, SMTP), and why network communication is organised into layers. This is part of the Communication content in Unit 1 of WJEC GCSE Computer Science (3500).
What a protocol is
TCP/IP
HTTP, HTTPS, FTP and SMTP
Why communication is layered
Try this
Q1. State what a protocol is. [1 mark]
- Cue. A set of rules that govern how devices communicate over a network.
Q2. State which protocol is used to send email between servers. [1 mark]
- Cue. SMTP (Simple Mail Transfer Protocol).
Exam-style practice questions
Practice questions written in the style of WJEC exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
WJEC-style Unit 14 marksState what is meant by a protocol and describe the purpose of two of the following: HTTP, HTTPS, FTP, SMTP.Show worked answer →
A Unit 1 protocols question. A protocol is a set of rules that govern how devices communicate over a network, so that different devices can exchange data reliably (1 mark). Then award up to 1 mark each for two described protocols. HTTP (HyperText Transfer Protocol) is used to request and transfer web pages between a browser and a web server. HTTPS is the secure version of HTTP that encrypts the data, used for sensitive activities like online banking and shopping. FTP (File Transfer Protocol) is used to transfer files between computers over a network. SMTP (Simple Mail Transfer Protocol) is used to send email between servers. Markers reward the rules definition plus two correct purposes. A common error is to confuse HTTP with HTTPS, missing that HTTPS adds encryption.
WJEC-style Unit 13 marksExplain why network communication is organised into layers.Show worked answer →
A Unit 1 explain question. Network communication is split into layers, each handling a specific part of the job (such as the physical connection, addressing, or the application), with protocols defined for each layer (1 mark). Layering makes the system easier to design, understand and maintain, because each layer can be developed and changed independently as long as it still works with the layers above and below (1 mark). It also means different hardware and software from different manufacturers can work together, because they all follow the agreed layered standards (1 mark). Markers reward dividing the task into manageable parts and the benefit of independent layers that interoperate. A common error is to describe layers as making the network faster, which is not the main reason.
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