For example, a firewall might block access to known malicious IP addresses to block command-and-control (C2) traffic or websites with malware.

Depending on the type and filtering that a firewall can apply, most direct attacks can be blocked.įor example, a Web Application Wifewall (WAF) can pre-scan URLs for SQL injection attacks (SQLi) or log4j attack patterns.Ī firewall can block traffic from internal to externalĪ firewall can block traffic originating from internal systems to external destinations.

The main function is to restrict unauthorized access from external IP addresses. A firewall is the first line of defense against threat actors attempting to disrupt business operations, compromise corporate data, or commit theft for financial gain.Ī firewall can block attacks from external sources They help prevent malware infections, intrusions, worms, data leaks and various other types of cyber attacks.įirewalls are one of the fundamental building blocks of enterprise IT security. While firewalls aren't perfect, a sophisticated firewall architecture is a must-have in any organization's security arsenal. Segmentation in order to set tightly meshed limits for attackers who have already successfully penetrated the network. (perimeter firewall with a DMZ for the servers accessible from the Internet) but also within the LAN to ensure appropriate

NGFW (additional integration of external threat intelligence sources and IDS/IPS systems)Īn enterprise firewall architecture should not only provide protection between the outside and the inside of the LAN.

Application level (application protocol like HTTP, OSI Layer 5+).

Connection level (TCP level, OSI layer 4).

The filtering of network traffic can take place on different levels

Firewalls create a barrier between different networks and control incoming and outgoing network traffic.

Firewalls and network security