Network Security Fundamentals

Learn how to secure your network infrastructure against cyber threats.

Key Network Security Concepts

🛡️ Firewall Configuration
🔐 SSL/TLS Encryption
🔍 Intrusion Detection
⚠️ Vulnerability Management

1. Firewall Configuration

A firewall is the first line of defense for network security. Configure rules to block or allow traffic based on defined criteria.

iptables -A INPUT -p tcp --dport 22 -m comment --comment "SSH Access" -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -m comment --comment "HTTP" -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -m comment --comment "HTTPS" -j ACCEPT

2. Secure Communication

Implement encryption protocols to secure data transmission across networks using SSL/TLS standards.

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365
sudo mv key.pem /etc/ssl/private/my.key
sudo mv cert.pem /etc/ssl/certs/my.crt

3. Network Monitoring

Continuously monitor network traffic for suspicious activity using intrusion detection systems like Snort.

Show Snort Rule Example ▼

alert tcp any any -> any any (msg:"Suspicious Activity Detected"; sid:1000001;)

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