Network devices in the form of hardware or software used to control outbound packet traffic, prevent unauthorized access to data or resources, and isolate networks (Intranet, Internet, etc.) with different priorities and characteristics on the basis of a rule set.
Just like firewalls used to protect buildings from fires or trap fire in one place, an Internet firewall is designed to be used to protect your system from unwanted data and viruses.
Firewalls; It is regarded as the first and indispensable step of security in protecting against threats such as attackers, Trojans, viruses, worms, or malware.
how ips works
A firewall controls the system administrator's access to resources between the outside world and the network being managed by monitoring traffic to and from those resources.
Next Generation Firewall (NGFW-Next Generation Firewall):
Traditional firewalls are devices that are set to allow or block traffic at the gateway according to their source and destination addresses, the port / service used, and the protocol. This method has lost the competence of the traditional firewall approach for good gateway control due to next generation threats and increased attacks. Application control is one of the points where insufficiency is felt in the traditional method. Since only port-based restrictions can be implemented in traditional structures, applications from other allowed ports can be run. For example, 80 (http) port must be left open for internet access in your institution or it may be necessary to open inward for the web server. Many applications in advanced technologies can now be passed through the 80 port and this cannot be controlled in the traditional structure. Such controls can only be performed by Application Control Sensors and IPS signatures
