A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules). It is essentially a barrier that sits between a private internal network and the public Internet. The main purpose of a firewall is to allow non-threatening traffic in and to keep dangerous traffic out. Firewalls can be categorized as a network-based or a host-based system). Network-based firewalls are positioned between two or more networks, typically between the local area network (LAN) and wide area network (WAN), and their basic function is to control the flow of data between connected networks). Firewalls can be hardware, software, software-as-a-service (SaaS), public cloud, or private cloud (virtual) .
Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet. Firewalls play an important role in preventing cyber attacks, protecting sensitive data, and maintaining the privacy and security of computer systems and networks. Firewalls, and especially Next Generation Firewalls, focus on blocking malware and application-layer attacks, along with an integrated intrusion prevention system (IPS) . By leveraging a firewall for your security infrastructure, you’re setting up your network with specific policies to allow.
Firewalls can be hardware-based or software-based. Hardware-based firewalls provide an additional line of defense against attacks reaching desktop computing systems. However, they are separate devices that require trained professionals to support their configuration and maintenance. Software-based firewalls, on the other hand, are installed on individual computers or devices and can be configured by the user.
Overall, firewalls are an essential part of any security architecture and take the guesswork out of host level protections and entrust them to your network security device.
