Firewall, also known as a protective wall, as the name suggests, is used to ensure security in computer networks. The firewall, which can be optionally chosen for corporate or individual use, what it is, how it works, and its operating principles will be answered below.
What is a firewall and how does it work?
A firewall is a special system created for computers. Thanks to the firewall, the device used can operate in a compatible manner. The role of this software is to decide, within the previously defined rules on the network used, whether the information can reach the desired destination or not. Previously defined packets can pass through the firewall without being blocked, thus ensuring a high level of protection in the network.
We can evaluate the firewall in two ways. For example, a simpler version is sufficient for individual use, while more complex and systematic versions are preferred for systems where network security is more important, such as in companies.
What is the importance of a firewall?
Firewall systems have two different technical characteristics. The first is hardware-based, and the other is software-based. The software-based firewall is usually installed on the operating systems of clients and servers. Since it is installed on a single network, it has a simpler structure and is suitable for individual use.
The hardware-based firewall works only together with the firewall device and is suitable for companies. In conclusion, whether based on software or hardware, firewalls have the same importance for all network systems. Thanks to this system, attacks and threats that may come through the internet will be protected against.
What are the types of firewalls?
The firewall was first developed in the 1980s and, over time, has evolved to make data and its transfers safer and more complex. The changing and evolving structure led to the market launch of stronger types of firewalls. Thus, there are currently three different generations of basic firewalls. They are listed as follows:
- First-generation packet filtering firewalls,
- Second-generation circuit-level firewalls,
- Third-generation application-level firewalls.
