Make challenging A Level Computer Science topics easier to understand with these interactive HTML simulators. Designed specifically for the AQA A Level Computer Science (7517) specification, each simulator guides students through key concepts step by step, helping them visualise how networks and security technologies work. Perfect for classroom teaching, revision, independent learning or homework, with no installation required – simply open and use in any modern web browser. Topics included: Packet Switching Subnet Masking Public & Private IP Addresses (NAT) DHCP DNS Resolution Firewalls Encryption Digital Signatures