← Network Security learning pathNetwork Security · Module 1 of 10
Security fundamentals
Learn the core goals and language of network security.
📖 Key ideas
- CIA triad: Confidentiality, Integrity, Availability.
- Threat: possible danger; vulnerability: weakness; risk: likelihood × impact.
- Defence in depth uses many layers of protection.
- Least privilege: give only the access needed.
- Security is a continuous process, not a one-time product.
💡 Real-life example: Network security is protecting a house with a gate, locks, cameras and a guard dog: many layers together.
ConfidentialityOnly authorised people see data
IntegrityData is not altered improperly
AvailabilitySystems work when needed
Defence in depthMultiple security layers