# Introduction to Network Security

- [Network Basics](/network-security/courses/isci-cnss-course/introduction/network-basics.md): A network is simply a way for machines / computers to communicate.
- [Basic Network Utilities](/network-security/courses/isci-cnss-course/introduction/untitled-1.md)
- [The OSI Model](/network-security/courses/isci-cnss-course/introduction/untitled-2.md): The Open Systems Interconnect (OSI) model describes how networks communicate.
- [Threat Classification](/network-security/courses/isci-cnss-course/introduction/threat-classification.md)
- [Security Terminology](/network-security/courses/isci-cnss-course/introduction/security-terminology.md)
- [Approaches of Network Security](/network-security/courses/isci-cnss-course/introduction/approaches-of-network-security.md)
- [Law and Network Security](/network-security/courses/isci-cnss-course/introduction/law-and-network-security.md)