Last Updated: November 21, 2025
Network Security
Protect your network infrastructure
Network Security Layers
| Item | Description |
|---|---|
Perimeter Security
|
Firewalls, DMZ |
Access Control
|
Authentication, authorization |
Encryption
|
VPN, TLS/SSL |
Monitoring
|
IDS/IPS, SIEM |
Endpoint Protection
|
Antivirus, EDR |
Network Segmentation
|
VLANs, subnets |
Firewall Rules
- Default deny: Block all, allow specific
- Whitelist known good traffic
- Restrict by source/destination IP
- Filter by port numbers
- Log all denied connections
- Regular rule audits
- Separate internal/external zones
Common Attacks
| Item | Description |
|---|---|
DDoS
|
Overwhelm with traffic |
Man-in-the-Middle
|
Intercept communications |
Port Scanning
|
Discover open services |
Packet Sniffing
|
Capture network traffic |
ARP Spoofing
|
Redirect network traffic |
DNS Spoofing
|
Redirect to malicious sites |
Security Best Practices
- Enable firewall on all systems
- Use strong encryption (WPA3 for WiFi)
- Implement network segmentation
- Monitor network traffic for anomalies
- Keep firmware and software updated
- Disable unnecessary services
- Use VPN for remote access
- Regular security audits
💡 Pro Tips
Quick Reference
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