Cybersecurity — Network Security
Network security layers
- Perimeter: Firewalls, DMZ
- Network: Segmentation, VLANs
- Host: Antivirus, HIDS
- Application: WAF, secure coding
- Data: Encryption, DLP
Network segmentation
# Create VLANs
# Switch configuration
vlan 10
name Sales
vlan 20
name Engineering
Port scanning
# Nmap scan
nmap -sV -p 1-1000 target_ip
# Service detection
nmap -sV -O target_ip
Packet analysis
# Wireshark filter
tcp.port == 80 && ip.src == 192.168.1.100
# tcpdump
tcpdump -i eth0 -w capture.pcap
Best practices
- Segment networks
- Monitor traffic
- Implement least privilege
- Regular security audits
Mini Practice
- Set up network segmentation
- Scan for open ports
- Analyze network traffic
- Implement access controls
Up Next
Continue with Firewalls - Traffic filtering.
Related Topics
Frequently Asked Questions about Network Security
What is Network Security in Cybersecurity?
Network Security is a fundamental concept in Cybersecurity. This lesson explains it step by step with clear examples, making it easy for beginners to understand.
How do I learn Network Security?
Start by reading the explanation above, then try the code examples. Practice by modifying the examples and experimenting with different values. Hands-on practice is the best way to learn Network Security.
Why is Network Security important in Cybersecurity?
Network Security is essential for Cybersecurity development. Understanding this concept will help you write better code and solve real-world problems more effectively.