Why do I need a firewall?

What is a firewall?

A firewall is a phaser or piece of hardware that can monitor and control access to the system and computer and manage the traffic that traffic and data want to be exchanged on the network so that the reheard can measure the system's security. Increase and prevent some malware and viruses from entering it. The Firewall can check and control all the data packets that enter the design from the network and allow them to enter if the packages are safe. In other words,  a firewall is a piece of hardware or security software  that can be used to increase system security.

Why use firewalls?

It should be noted that the purpose of using air traffic controllers is to isolate secure data from insecure areas and control and manage the communication between these devices. In this case, if the data is safe and sound in an uncertain environment and area, it separates them so as not to cause contamination and insecure data. The Firewall has other capabilities and can-do other things. Still, in general, we can say that the Firewall's job is to monitor and manage the connections between secure data and insecure areas, as well as input and output communications. Firewalls can prevent unauthorized access to private networks and provide a safe framework for comprehensive networks.

How does a firewall work?

You may be wondering how firewalls can manage secure and insecure data and increase their security by examining system input and output communications. It should be noted that firewalls have a wall of code that separates the computer from the Internet. Firewalls can control all the data that enters your system from the Internet or leaves your system. After checking and arresting, they say whether this data may have left your system or entered your system or not. In other words, by using a wall, the code they have creates a barrier between your system and your Internet to examine the data that leaves your system or the data that enters your system. In contrast, the data and packets are safe and have no problems. They are allowed to enter or leave. After examining the input or output data, it determines whether it is secure or insecure and then decides whether to block the data or allow it to enter and exit.

It should be noted that a Firewall is one of the most critical and central  layers of security  in computer systems that can also be used in computer networks. Failure to use the security layers of the Firewall can make it easier for hackers to enter the system and sabotage without any restrictions. In other words, if there is no firewall, hackers will have no limits and will be able to quickly enter the users' system and cause damage to their system. They cause the system to crash by sending insecure and malicious data and some malware.

In other words, a firewall is a filter through which data can pass through. To better understand a house, consider entering through the door if people want to join the house. The Firewall is located exactly at the door of the network and system to check the inputs and outputs and decide after checking and controlling Whether to allow them to enter or leave or to block them. So we knew that firewalls are the same layers of security in networks and computer systems that are placed at the gateway or the door of networks and systems to check their inputs and outputs.

What can firewalls do?

The duties and responsibilities of firewalls are listed below:  They can be used to protect resources. Firewalls can grant authorized access. Firewalls are responsible for managing and controlling network traffic. Firewalls can even save everything that happened and then report it. A firewall can act as an intermediary between the network and system gateway rather than between information packets and the system and network.

What is a personal firewall?

In the age of technology and when the Internet is widely used, we need the Internet to do all the work and meet the needs. Our computer systems are connected to the Internet and use it. As you know, with the increase and advancement of technology and techniques, hacking tools also increase and develop, and we must protect our system against abusers. Therefore, using security tools such as firewalls is very important and necessary. Having a personal firewall will enable us to protect our data and system.

Having a personal firewall, we will be able to check the data and data packets that enter our system or leave our system, and if necessary, allow them to enter and otherwise block them.

Interestingly, a high-speed connection can also damage the system. In this case, by connecting to the high-speed Internet network, data packets quickly enter or leave our system. Therefore, to prevent such problems, we must use personal firewalls installed privately on our system and computer network.

What are the problems with high-speed internet connections?

Existence of a fixed IP:

It is worth knowing that the existence of fixed IPs causes the intruder who found your IP address always to bother you and cause destructive effects.

High-speed access:

High-speed access causes attackers and malicious packets to enter your system as quickly as possible and not pause.

Permanent connection:

This means that every time your system is connected to the Internet, your system becomes vulnerable.

What is the importance of personal firewalls, and why do we need them?

Because we are always connected to the Internet, and for this reason, we need a firewall or the same security layer. It is possible that in some public places such as parks, cafes, airports, libraries, restaurants and malls, shopping, etc., we are connected to the Internet and public Wi-Fi. This connection to the public network will make our security layer less, weakening them. It is better to use personal firewalls to increase the system's security. Firewalls better secure the home network to which we are connected.

Different types of firewalls

Firewalls, which are the same security layers to protect systems during inbound and outbound communications, have different types. Depending on the type of system and our needs, we can choose the right style to use to take care of our system.

In general, firewalls are in the category of network-based or Based on the host firewalls.

The following are the different types of firewalls:

- Packet-filtering:

Rejection of this type of Firewall when transmitting and sending data packets, the source address, a destination address, required protocol, and the port number of the destination is inserted. These types of firewalls generally work on the OSI network layer.

- stateful inspection:

These firewalls are also known as forensic firewalls that have a table that can compare the information in the package header with the information in the table.

- Application Layer and Proxy:

This type of Firewall is one of the most essential and effective firewalls that can be used to protect the system and data packets in computer networks.

- Software firewalls:

These types of firewalls can be the same as personal firewalls that purpose of the security software development ( in French:  développement de logiciels de sécurité  ) is running on computer systems. These firewalls can be used on home computer networks or small offices.

- Hardware firewalls:

These firewalls are also more complex than software firewalls and are designed for a network device or are designed and developed specifically on the server. It is worth mentioning that you know that the operating system with a hardware firewall has no other software. That is why the attack on that system becomes complicated, and its security is very high.