What is Firewall Full Detail in Hindi ?
A firewall is a network security device or software that monitors and controls incoming and outgoing network traffic based on predetermined security rules. The primary purpose of a firewall is to establish a barrier between a secure internal network and untrusted external networks, such as the internet. It acts as a security gatekeeper, inspecting and regulating data packets to prevent unauthorized access, data breaches, or malicious activities.
Firewalls can operate at various layers of the OSI (Open Systems Interconnection) model, including:
- Packet Filtering (Network Layer): Examines packets of data and makes decisions based on source and destination addresses, as well as port numbers.
- Stateful Inspection (Network Layer): Tracks the state of active connections and makes decisions based on the context of the traffic.
- Proxy (Application Layer): Acts as an intermediary between client and server, forwarding requests on behalf of the client. This can provide additional security by hiding the internal network structure.
- Next-Generation Firewall (NGFW): Combines traditional firewall functionality with advanced features, such as intrusion prevention, deep packet inspection, and application-layer filtering.
Firewalls are crucial components in network security, helping to prevent unauthorized access, protect against cyber threats, and ensure the confidentiality, integrity, and availability of sensitive data. They are commonly used in both home and enterprise environments to safeguard networks and connected devices from various forms of cyberattacks.
