The primary purpose of a firewall is to protect a computer network from unauthorized access and to regulate incoming and outgoing network traffic based on predetermined security rules. Firewalls act as a barrier between a trusted internal network and untrusted external networks, such as the internet, and are crucial for maintaining network security.
Key Functions of a Firewall:
Traffic Filtering: Monitors and filters network traffic, allowing or blocking data packets based on security rules.
Access Control: Enforces policies to restrict or permit access to network resources, ensuring only authorized users and devices can access the network.
Threat Prevention: Blocks malicious traffic and attacks such as malware, viruses, and intrusions.
Logging and Monitoring: Records and monitors network activity, providing valuable information for identifying and responding to security incidents.
Network Segmentation: Divides a network into segments to contain potential breaches and limit the spread of threats.
Types of Firewalls:
Packet-Filtering Firewalls: Inspect individual packets and block or allow them based on predefined rules.
Stateful Inspection Firewalls: Monitor the state of active connections and make decisions based on the context of traffic.
Proxy Firewalls: Intercept and filter traffic at the application layer, providing a barrier between the network and external traffic.
Next-Generation Firewalls (NGFWs): Combine traditional firewall capabilities with advanced features like intrusion prevention, application awareness, and threat intelligence.
If you want to learn more please consult those links:
Kaspersky. What is a Firewall. Definitions and explanations
Disclaimer: The information provided on this page is sourced from various external references and does not reflect the original content created by this site. For more detailed information, please refer to the original sources listed above in the links.