Module 7: Network Security
Security is paramount in modern networking.7.1 Firewalls
A Firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules.- Packet Filtering: Inspects headers (IP, Port).
- Stateful Inspection: Tracks connection state.
- Application Layer (WAF): Inspects payload (HTTP).
7.2 VPN (Virtual Private Network)
A VPN extends a private network across a public network.- Tunneling: Encapsulates packets inside another protocol.
- Encryption: Protects data from eavesdropping.
7.3 TLS / SSL
Transport Layer Security (TLS) encrypts communication over a computer network.- Handshake: Negotiates cipher suite and exchanges keys.
- Certificates: Verifies identity using PKI (Public Key Infrastructure).
7.4 Common Attacks
- DDoS (Distributed Denial of Service): Overwhelming a target with traffic.
- MITM (Man-in-the-Middle): Intercepting communication.
- Phishing: Deceptive emails to steal credentials.
Next Module
Module 8: Advanced Networking
SDN and the Cloud.