🔥 Firewalls

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🔥 Firewall Security

Protect Networks From Unauthorized Access

📖 What is a Firewall?

Firewall என்பது Network Security Device அல்லது Software ஆகும்.

இது அனுமதிக்கப்பட்ட Traffic-ஐ மட்டும் அனுமதித்து, ஆபத்தான Traffic-ஐ தடுக்கிறது.

Firewall = Network Gatekeeper

🎯 Why Firewalls?

✔ Block Unauthorized Access

✔ Prevent Attacks

✔ Monitor Traffic

✔ Protect Internal Networks

✔ Improve Security

🔥 Types of Firewalls

✔ Packet Filtering Firewall

✔ Stateful Firewall

✔ Proxy Firewall

✔ Next Generation Firewall (NGFW)

✔ Cloud Firewall

📦 Packet Filtering

Source IP, Destination IP மற்றும் Port Number அடிப்படையில் Traffic அனுமதிக்கப்படுகிறது.

Source IP
Destination IP
Port Number
Protocol

🔄 Stateful Firewall

Connection State-ஐ நினைவில் வைத்து Traffic-ஐ அனுமதிக்கும் Firewall.

Stateless Firewall-ஐ விட பாதுகாப்பானது.

🚀 Next Generation Firewall

✔ Deep Packet Inspection

✔ Application Awareness

✔ Malware Protection

✔ Intrusion Prevention

🌐 Firewall Rules

Allow HTTP (80)

Allow HTTPS (443)

Allow SSH (22)

Deny All Others

🔐 Firewall Best Practices

✔ Least Privilege

✔ Regular Updates

✔ Log Monitoring

✔ Strong Policies

✔ Backup Configurations

🌍 Real World Usage

✔ Enterprise Networks

✔ Data Centers

✔ Cloud Security

✔ Telecom Networks

✔ Banking Systems

🎤 Interview Questions

What is a Firewall?

Types of Firewalls?

What is Stateful Inspection?

What is NGFW?

What is Packet Filtering?

Why Firewall is Important?

📝 Summary

Firewall என்பது Network Security-யின் முதல் பாதுகாப்பு அடுக்கு ஆகும்.

அனைத்து நிறுவனங்களிலும் Firewalls முக்கிய பங்கு வகிக்கின்றன.

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