← A-Level Digital Technology (WJEC) - Complete Course Guides for Theory
Unit 3: Connected Systems
Completed26 August 2026
Education
The A2-level unit of the WJEC Digital Technology specification. This guide covers:
- Collecting, storing, analysing and using data — data collection methods and ethics, binary data and storage, data analytics, data warehouses, AI, neural networks, and expert systems
- Cyber security — threats and vulnerabilities, malicious software, resilience controls, encryption, firewalls, cryptography, biometrics, and social engineering
- Digital technology networks — hardware/software/infrastructure components, network servers, LAN/WAN/VLAN/WLAN/VPN, and distributed networks
Full exam-board-aligned definitions and notes, cross-referenced against the WJEC specification.