What Is Firewall And Uses And Type?


Firewall means a network security device that protects the computer from Virus and Malware and ensures that all the data stored in your computer is safe from any other unknown person and it cannot be touched by him. Well, this security is called ‘Firewall’. Those people who use computers and the Internet will be well aware of this. It is the computer’s security cover that acts as a security wall between authorized and unauthorized networks.

Uses of Firewall:-

To use Firewall you need to have complete knowledge about Firewalls. A firewall is a computer security system designed to protect all types of computers and networks from hackers, malware, and viruses. Firewall protection is to protect the computer which prevents viruses from entering the computer or viruses from one computer to another.

If we are using the Internet, then many websites try to put viruses in our computers, which the firewall device blocks and keeps the computer safe. A firewall is a type of antivirus, which is already installed on the computer.

How does Firewall Works?

A firewall is also called a system to provide two-way protection. When a user connects to the Internet on his computer or another device, there is a fear of getting into the device with all the harmful software on the Internet. The firewall acts as a security shield between these networks, this is the job of the firewall. Its main function in the computer is to filter the network so that unauthorized things like malware, virus, spyware, etc. do not enter your computer and damage it.

Benefits of firewall :-

By the way, there are many advantages of firewall because it completely protects our computers and laptops. Let us know about some of them:

Traffic Monitor

The firewall monitors all traffic entering your computer network. The firewall performs double duty, as the firewall also monitors the traffic going out of the network.

Control Hackers

Without firewall security, hackers can easily hack your computer and do harm to you by spreading viruses, having a firewall keeps hackers out of your network.

Virus Filtering

If your computer is connected to another computer through networking and you are sharing files, then at that time also the firewall will protect your computer from the virus coming from the other computer, if your computer has a virus then the firewall will also protect it from the other computer. prevents you from leaving.

Bandwidth Control And Monitoring

Bandwidth control is sometimes referred to as traffic shaping, which is one of the best features of a firewall. We do not always have an unlimited amount of bandwidth, which means that we have to keep control over the bandwidth available to us. With a firewall, you can control the bandwidth available to websites, applications, and users.

Web Filtering

A web filter firewall is defined as a software program. It oversees the data packets sent by the computer. It can also be used to block employees from accessing certain sites, which can reduce productivity, such as social networking websites.

Virtual Private Network

Virtual private networks are networks that are created using public wires (usually the Internet) to connect remote users or regional offices to a company’s private, internal network. VPN can also be used to connect 2 sites together.

Disadvantages Of Firewall:-

After knowing so many advantages of Firewall, now we will know about some of its disadvantages.

If you do not use a good company firewall, then it can also slow down the speed of your system by using more of your system’s resources like CPU, RAM.
The firewall also has some limitations. It protects the computer from a bad network, but if the computer gets floppy disk, malware, virus, or harmful software, then the firewall is not able to protect the system.
If you are using a software firewall, it only protects the computer that has it installed.

Types of firewall:-

There are the following types of firewalls:-

  1. packet filter firewall:- This firewall works in the network layer of the OSI model. This firewall analyzes the incoming and outgoing packets and it allows only those packets to pass through it which are correct according to the firewall policy.

This firewall checks each packet and then decides whether to forward this packet or not. It protects the local network from intrusion.

There are two types of packet filter firewall which are as follows:-

a. Stateless packet filter: – This firewall does not contain information about packets. This type of firewall is called a static firewall. These firewalls are not that effective.

b. Stateful packet filter:- This firewall provides information about packets. this is also called a dynamic firewall. These firewalls provide more security.

  1. Application-level gateway firewall: – It is also called application proxy. This firewall allows the packet to pass through itself or intercepts the packet depending on the information of the application. Application information is available in packets.

This firewall is a type of proxy server that provides the proxy to applications.

  1. circuit-level gateway firewall:- This firewall works in the session layer of the OSI model. This firewall provides the security of TCP (transmission control protocol) or UDP (user datagram protocol).

This firewall analyzes each packet in TCP or UDP and it takes action on the packets according to the firewall policy.

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