A firewall is a network security system that filters all traffic according to preset principles and rules. If you imagine a server as a small apartment building, the Firewall is a diligent guard, which monitors the order day and night and does not let in anyone who arouses even the slightest suspicion.
There are following types of firewalls:
The second option is way more preferable for securing branched corporate networks at the expense of increased fault tolerance and performance.
Information between servers and computers on the Internet is transmitted in packets – small pieces of data that contain some information. When you send a file to someone, it is divided into packets, transmitted over the network, and reassembled on the spot according to specific instructions. The firewall is there to analyze and inspect these data packets for the introduction of malicious code. If the "barrier" deems a packet suspicious, it will simply block it, thus preventing a threat to the destination server.
There are two kinds of firewalls:
Both types of firewalls have their own specific applications, but the first option – Stateful – is considered more reliable and flexible.
The firewall protects the network on several levels simultaneously:
Here, however, there are nuances, and no firewall can provide 100% protection against DDoS attacks. The degree of protection increases, and with the right configuration of firewalls, DDoS attacks will be much less effective, but practice shows that even large companies from time to time are subjected to such attacks, and sometimes hackers even do manage to achieve their goals.
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A firewall is necessary for any project that is connected to the Internet and that regularly receives data "from the outside". Installing and configuring the firewall will not require a serious investment, the first thing you need here is a competent system administrator or cybersecurity specialist who can properly configure the software, and prescribe all the necessary rules and algorithms.
There are also ready-made solutions that can be connected "out of the box" to an existing corporate network. They require minimal time and effort to implement but also cost a lot more. If you have any questions, please contact our specialists through Livechat.