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Network Security
Comprehensive network security concepts including firewalls, VPNs, and intrusion detection systems.
Firewall Types
Packet Filtering Firewall
Advantages:
- • Fast
- • Low cost
- • Transparent to users
Disadvantages:
- • Limited inspection
- • No application awareness
- • Vulnerable to IP spoofing
Network Security Tools
Intrusion Detection System (IDS)
Monitors network traffic for malicious activity
Types:
- • Network-based IDS
- • Host-based IDS
- • Hybrid IDS
Intrusion Prevention System (IPS)
Actively blocks detected threats in real-time
Types:
- • Network-based IPS
- • Host-based IPS
- • Wireless IPS
Virtual Private Network (VPN)
Creates secure encrypted tunnels over public networks
Types:
- • Site-to-Site VPN
- • Remote Access VPN
- • SSL VPN
Network Segmentation
Divides network into smaller, isolated segments
Types:
- • VLANs
- • Subnets
- • DMZ
- • Air-gapped networks
Access Control List (ACL) Builder
Add New Rule
Current ACL Rules
AllowTCP 192.168.1.0/24 → 10.0.0.5:80
DenyTCP 0.0.0.0/0 → 10.0.0.5:22
AllowUDP 192.168.1.0/24 → 8.8.8.8:53
Firewall Rule Tester
Network Security Best Practices
Defense in Depth
- • Multiple layers of security controls
- • Network segmentation
- • Regular security audits
- • Continuous monitoring
Access Control
- • Principle of least privilege
- • Strong authentication
- • Regular access reviews
- • Network access control (NAC)