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Firewalls act as sophisticated security shields that scrutinize network packets to prevent unauthorized users or harmful data from entering or exiting your network. They also enforce your security policies, blocking applications or data deemed unnecessary or dangerous and stopping threats like malware, phishing, denial-of-service attacks, and viruses.

Firewall rules define the conditions under which traffic enters or leaves your network based on specific criteria such as source and destination IP addresses, ports, communication protocols, and more. These firewall rules are nested together into Access Control Lists (ACLs) and evaluated in sequential order to determine whether or not to permit or block a network packet. Most off-the-shelf firewalls ship with preconfigured rulesets to cut deployment time and allow you to start defending against the most common threats.

Next generation firewalls go beyond basic packet inspection to elevate your protection by examining the actual content of each packet. This technology, known as deep packet inspection or DPI, enables your firewall to detect and block new and emerging cyber threats by analyzing the payload of each network packet rather than just its header information.

For more comprehensive security, a firewall can integrate with advanced threat prevention technologies such as intrusion detection system (IPS), antivirus, and malware defense to identify and stop malware and malicious threats before they get inside your network. These integrated firewall devices, often called UTMs or Unified Threat Management systems, provide a unified security platform for your entire network environment, including remote work environments and the cloud.