What Is a Firewall?
A firewall safeguards a network’s internal data from unauthorized access by blocking external access points and other cyberattacks. It is a central part of any cybersecurity solution for schools, and it is important to choose a high-quality product with the most up-to-date security features. The best firewalls offer anti-virus, DPI (deep packet inspection), and other security measures. They also use advanced algorithms to detect malware and other suspicious activities.
The firewall uses a combination of methods to examine data packets that travel from and to a school’s internal network. Depending on the type of firewall, it may operate at different layers of the standardized Open Systems Interconnection (OSI) model.
Some types of firewalls examine data packets at the network layer, while others examine them at the application layer. A newer method, called stateful inspection, monitors incoming information for specific identifying characteristics and compares them to a database of trusted information. If a match is found, the information is allowed to pass; otherwise, it is discarded.
Firewalls are available in both software and hardware forms. Some are integrated into networking devices like routers, while others are standalone appliances that can be configured and managed with a web-based interface or a command-line interface. A hardware firewall typically filters traffic between a private network and the outside world before it reaches individual user devices, making them more effective than software firewalls.
A software firewall can be run on a computer, in a virtualized environment, or on bare metal, and it can be used by multiple users. The best firewalls offer flexible management systems, a wide range of deployment choices, and a variety of throughput speeds.