Network security is the practice of protecting computer networks from unauthorized access, attacks, and data breaches. It ensures that sensitive information remains safe and systems continue to function smoothly. Firewalls are one of the most important tools in network security.
Key Features of Network Security
- Access Control: Restrict who can access the network and resources.
- Data Protection: Encrypts sensitive data to prevent theft or misuse.
- Threat Detection: Monitors networks to detect malware, viruses, and intrusions.
- Policy Enforcement: Ensures compliance with security policies and standards.
- Secure Communication: Protects data during transmission using VPNs and secure protocols.
What is a Firewall?
A firewall is a security device (hardware or software) that monitors and controls incoming and outgoing network traffic. It acts as a barrier between a trusted internal network and untrusted external networks like the internet.
Types of Firewalls
- Packet-Filtering Firewall: Examines packets of data and allows or blocks them based on rules.
- Stateful Inspection Firewall: Monitors active connections and decides which traffic is allowed.
- Proxy Firewall: Acts as an intermediary between users and the internet for added security.
- Next-Generation Firewall (NGFW): Combines traditional firewall features with intrusion detection, antivirus, and application control.
Where Network Security & Firewalls Are Used
- Corporate networks to protect sensitive business data
- Online banking systems
- Cloud platforms
- E-commerce websites
- Government and defense networks