Types of networks, including: local area network (LAN), wide area network (WAN), client-server, peer-to-peer, virtual private network (VPN), mobile networks

Methods of preventing network security issues, including: use of barriers, locks, surveillance, alarm systems, security guards, how software methods can prevent unauthorised access, including: o biometric methods o anti-malware o anti-virus and anti-spyware software for protecting data, files and systems o encryption o access rights/permissions for protecting data and files, how firewalls can be configured to control access to networks