What networking content does Eduqas GCSE Computer Science cover?

You need LANs and WANs and the benefits and drawbacks of networking; the bus, star and mesh topologies with their advantages and disadvantages; wired versus wireless connections; the purpose of network hardware (NIC, switch, router, wireless access point); the internet, the World Wide Web and DNS; the common protocols (TCP/IP, HTTP, HTTPS, FTP, SMTP, POP, IMAP); and the layered model with its advantages. The security half covers the threats and the protection methods.

What is the difference between a switch and a router?

A switch connects devices together on a single LAN and forwards each frame only to the port of the intended device using its MAC address, which reduces unnecessary traffic. A router connects different networks together and forwards packets between them using IP addresses, which is what links a home or office LAN to the internet. In short, a switch works within one network by MAC address, and a router works between networks by IP address.

What cybersecurity threats do I need to know for Eduqas?

Malware (viruses, worms, Trojans, spyware, ransomware), phishing (fake messages to steal credentials), social engineering (tricking people into giving away information or access), brute-force attacks (trying many passwords until one works), denial-of-service attacks (flooding a server so it cannot serve real users) and SQL injection (entering malicious SQL through an input field). For each, learn how it works and its aim.

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Networks and security overview - Eduqas GCSE Computer Science

Q: How is a system protected against attack in Eduqas Computer Science?

Firewalls monitor and control network traffic against rules and block unauthorised connections. Encryption scrambles data into ciphertext so it is unreadable without the key, protecting it in transit and at rest. Strong passwords and account lockouts resist brute force, and biometrics authenticate by a physical characteristic. For data, regular backups (full and incremental), ideally kept off site or in the cloud, let data be restored after failure, deletion, malware or disaster.

A deep-dive guide to networks and security in Eduqas GCSE Computer Science: LANs, WANs and topologies, wired versus wireless and network hardware, the internet, the web, DNS and the common protocols, the layered model, the cybersecurity threats, and the methods used to protect a system and its data.

Generated by Claude Opus 4.812 min readEduqas GCSE CS 1.3 CommunicationUpdated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

Networks: LANs, WANs and topologies
Connections and hardware
The internet, protocols and the layered model
Security: threats and protection
How to revise this topic

This module is the communication and security core of Component 1: how computers are connected into networks, how data moves across the internet, and how systems and data are protected. Each section links to a focused answer page with worked Eduqas exam questions.

Networks: LANs, WANs and topologies

A LAN covers a small area owned by one organisation; a WAN covers a large area and often uses third-party infrastructure (the internet is the biggest WAN). Networking lets users share files, an internet connection and peripherals, but adds security risks and cost. The three topologies are bus (cheap but a backbone fault stops everything), star (reliable, easy to fault-find, but depends on the central switch) and mesh (very resilient but expensive). See the LANs, WANs and topologies page.

Connections and hardware

Wired connections are faster, more stable and more secure but less mobile; wireless connections give mobility but need encryption and have more variable bandwidth. The key hardware: a NIC connects a device and gives it a MAC address, a switch forwards frames within a LAN by MAC address, a router forwards packets between networks by IP address, and a wireless access point lets wireless devices join. See the wired, wireless and hardware page.

The internet, protocols and the layered model

The internet is the global network of networks; the World Wide Web is one service that runs on it; DNS turns domain names into IP addresses. The protocols each have a job: TCP/IP (packets and routing), HTTP/HTTPS (web pages, secure), FTP (files), SMTP (send email), POP/IMAP (receive email). See the internet and protocols page. Communication is organised into a layered model (the four-layer TCP/IP stack), which lets one layer change without rewriting the others and isolates faults. See the layered model page.

Security: threats and protection

The threats are malware, phishing, social engineering, brute force, denial of service and SQL injection, each with its own mechanism and aim. See the cybersecurity threats page. The protection methods are firewalls (control traffic), encryption (make stolen data unreadable), strong passwords and account lockouts (resist brute force), and biometrics (physical authentication), plus regular backups kept off site for data recovery. See the protection and data management page.

How to revise this topic

Nail the comparison questions. LAN versus WAN, the three topologies, wired versus wireless, and full versus incremental backup are recurring contrast marks.
Learn the protocols as one-liners. Be able to give the single purpose of each protocol and not swap SMTP (send) with POP/IMAP (receive).
Separate the threats from the defences. Match each threat to how it works and its aim, and each defence to what it actually does (a firewall is not encryption).
Use scenarios. Designing protection for an online shop, or choosing a topology for an office, rewards applying the ideas, not just listing them.

Test yourself with the networks and security quiz, then work through each dot-point page for the full worked exam questions.