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Firewall is a tool that prevents unauthorized access to your network from hackers and different kinds of cyber threats. It maintains a wall of security between your internal network and other external sources such as the Internet by observing and controlling traffic according to predefined rules.

A firewall consists of hardware or software that observes traffic and blocks access to certain services based on the configuration. Network administrators create and implement a set of security policies that determine what kind of traffic the firewall can accept or deny. When a firewall receives a packet it looks at the source and destination addresses, port numbers, and protocol types to decide what to do with it.

Whenever a firewall receives network traffic, it first matches the packet against its ruleset. If the packet matches any of the rules, the associated action is applied. For instance, a rule may say any employee from human resources department should not access code server. When the firewall receives a packet with the address of human resource department and the port number of code server it will match the rule and block the packet.

Firewalls must be updated on a regular basis to protect the organization from new and emerging vulnerabilities. They should also be optimized to reduce processing and boost performance. It is essential to have an efficient firewall that is protected against various kinds of threats, and that also performs well without compromising the integrity of the data. Performing routine vulnerability scanning and penetration testing helps to identify flaws in the firewall. This in turn improves the firewall’s overall resilience against attacks.