← Computer Networks learning pathComputer Networks · Module 8 of 10
Network security basics
Protect networks and data in transit.
📖 Key ideas
- Firewalls allow or block traffic by rules.
- VPNs encrypt traffic over public networks.
- TLS secures web and email traffic.
- Segment networks to limit damage.
- Common threats: DDoS, MITM, phishing, malware.
💡 Real-life example: Network security is a gated colony with guards (firewalls), private roads (VPN) and sealed letters (TLS).
FirewallTraffic filter
VPNEncrypted tunnel
TLSTransport encryption
DDoSDistributed denial of service