Firewall: what it is, types and how to choose the best one

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A firewall can be described as a security system that controls network traffic on a device or network of devices. Its purpose is to allow lithuania mobile database traffic and block unauthorized traffic. There are different types of firewalls, each with their own characteristics and features. In this article, you will learn what a firewall is, what the main types are, and how to choose the best one for your environment.



What is a firewall?
Firewalls provide an excellent layer of protection for your networks, whether they are corporate or home. Using rules established by appropriate standards, they detect and filter unwanted packets to prevent malicious access.

This feature allows you to manage the data flow properly, ensuring that only trusted traffic passes through the firewall , thus guaranteeing the integrity and confidentiality of the information.



What is a firewall for?
A firewall is an invaluable tool for protecting corporate data. It controls what information enters and leaves your company’s computers over the Internet, preventing malicious software from infiltrating the network. An example of using a firewall to protect sensitive information can be found by dividing your HR services network , which stores employee personal data.

However, firewalls should not be considered the only security measure, as there can still be malware coming from emails or other external sources. This is why, in addition to a firewall, it is recommended that companies have a robust antivirus system installed.



What are the types of firewall?
Configuring a firewall depends on a number of factors, including developer discretion, network architecture, user requirements, and operating system. As a result, there are several types of solutions available. Here’s an overview of some of the main ones:



Packet filtering
Packet filtering is a powerful security tool. The firewall will apply a list of rules pre-configured by the developer, evaluating the information received. If they are compatible, the user will be authorized, otherwise access will be denied. There are two types of packet filtering:



Static
The results are obtained from data analysis using algorithms based on predefined rules . This approach offers good performance, but unintentional blocking may occur since the rules are static.



Dynamic
The dynamic packet filter solution is designed to address the limitations of static filters. By creating rules that adapt to the situation , it allows packets to pass when necessary and only for a pre-determined period of time, bypassing this bottleneck associated with static packets.