The security of computer systems has become an important issue today and users are looking for the best ways to protect the site against malicious programs as well as hackers, in this way, they may use various methods such as using safe passwords, constantly updating the system, using antivirus, not clicking on spam emails or other things that one of the most effective things they can do is to use a firewall.In the following, we will discuss how effective the use of firewalls is, and we will also examine whether hackers are able to pass the firewalls or not.

What is a firewall?

In fact, firewalls are network security systems which control traffic flow between the Internet and the private network, it also protects a system from illegal access and provides high network security for the system, there are three basic types of firewalls, each of which are going to be briefly described below.

A number of different types of firewalls:

- Proxy Server Firewalls:

This type of firewall is a network security system that can protect network resources well and provide high security in the connection between internal servers and the existing servers on the Internet.

- Stateful Inspection:

These types of firewalls can also provide high security in the network and use the smartest methods to block unauthorized traffic and ultimately provide high security for the system.

- Packet Filters:

These types of firewalls, compared to other types, have less ability to provide security for the network and analyze all the data that enters or exits the system, and in case of a suspicious act, the data is not allowed to enter the system.In fact, these types of firewalls are suitable for small networks and do not have a high ability to increase network security for large companies.

The things that firewalls protect the system and information from:

There are different types of firewalls, and each of them protects the computer system against different factors, firewalls detect unauthorized traffic and prevent any further damage quickly.- They allow the internal attacks to be minimized.- Firewalls are one of the most suitable tools that can prevent the entry of malware and protect the system against such malware, in addition to the things mentioned above, firewalls have other capabilities, and we are going to mention some of the best firewalls in 2021 below.

The Best firewall of 2021:

- Bitdefender Total Security:

Bitdefender Total Security is one of the strongest security that protects the system against viruses as well as malware, through this firewall, a wide range of items that are necessary for system security can be achieved, by providing one of these firewalls, you can protect information on five devices, for example, you can use the same type of firewall that you have provided for both your personal computer and your mobile device. 

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