Why Firewall required in a Network? | Importance of Firewall in a Computer Network

The FireWall site provides information on Internet security risks and solutions, providing educational resources and a useful resource database for IT professionals.

What is FireWall?

A firewall is a method of securing a computer system from unauthorized access, either from outside the private network (public internet) or inside the private network (internal). In order to accomplish this task, firewalls operate at three levels – application layer, transport layer, and network layer – although they may overlap at different layers. A firewall is generally implemented using software that runs on a general purpose computer that connects directly to a physical network device providing connectivity to the external world.

Firewall in a Network

A firewall is a software application designed to protect computers on a local area network (LAN) from unauthorized access. A firewall program operates at several layers of abstraction, beginning at the lowest level, where it monitors traffic entering and leaving each computer on the network. If the program identifies a problem, it informs the user and may block further incoming activity.

In addition to protecting individual computers, firewalls are often implemented in larger networks to provide additional security. In these cases, they monitor incoming traffic on ports other than those generally associated with email and Web browsing, such as port 25 for SMTP mail transfer protocol (MTP), port 80/443 for HTTP and HTTPS, and port 443 (HTTPS only) for secure MTP connections. More advanced firewalls also monitor the content of data passing between computers, making it possible to examine and filter certain types of information based on its contents.

Why Firewall required in a Network?

  1. Firewalls are used for two purposes – to prevent unauthorized access to computers connected to the Internet and to protect users’ computer systems from damage caused by viruses and worms.
  2. A firewall is a security device that works at both host and router level. It prevents any kind of incoming or outgoing connections from being established between different hosts (machines).
  3. Firewalls operate at a layer below routers and allow only certain types of traffic to pass through the firewall (e.g., HTTP, FTP, SMTP, NNTP, etc.).
  4. Firewalls are implemented using software and hardware. Software firewalls use operating system settings for controlling whether incoming packets should be allowed or not. Hardware firewalls intercept the packets before they reach the computer’s data-processing facilities.
  5. In order to prevent malicious attacks, firewalls need to have two features: filtering and packet inspection. Filtering refers to the ability of a firewall to permit or deny the passage of specific protocols or applications. Packet inspection involves checking each individual packet to ensure their validity.
  6. There are three classes of firewall devices – proxy servers, application gateways, and inline firewalls. Proxy servers work between a client and the content server. Application gateways act as proxies for web browsers and provide Web site caching functionality. Inline firewalls are placed directly in front of the client computer. They inspect all incoming and outbound network traffic.
  7. In general, it is recommended that a combination of software and hardware solutions is deployed. However, if malware cannot get past a software firewall, then a hardware solution may be sufficient.
  8. The basic concept behind a firewall is to make sure that your computer is always safe from attack.
  9. If your computer is infected with malware and you want to remove it, the best way to do that is by disconnecting your computer from the internet. Then, download anti-malware tools and scan the hard drive for files that are related to malware. Once you have removed the malware, reconnect your computer to the internet and start installing updates to your antivirus program.
  10. When deciding what type of firewall to buy, consider how many computers/servers you own. You will need something that will scale well and cover all the bases.
  11. Also keep in mind that firewalls can slow down file transfers and downloads. To avoid this, choose a firewall that is lightweight.
  12. Firewalls can be built into a router or installed separately. Ideally, you want a firewall that supports IPv6.
  13. A good web browser does not necessarily mean that your computer will be safe from hackers. Ensure that you install a reputable web browser such as Microsoft Edge, Google Chrome, Mozilla Firefox, Safari, Opera, and Yandex.Browser.
  14. If you’re concerned about the security of your home network, you might want to look into purchasing a VPN service. These services encrypt your network traffic and help secure your communications over public networks.

Is it possible to hack a firewall?

Yes! A hacker can use many different techniques to get past a firewall. To combat these attacks, some firewalls provide several methods to lock down their systems to make sure no unauthorized access occurs. One way to stop hackers is to set up a secure login page, where users need to enter login information before being allowed to access the rest of the computer system. Another option is to require users to authenticate themselves before making changes to the system settings. In addition, firewalls may limit bandwidth or CPU usage, so attackers would have to break through these restrictions first before compromising the security of the system.

How does a firewall work?

The basic idea behind a firewall is simple: once a connection is established between two computers, it is difficult for someone else to interrupt. Since a user’s home network is likely physically sealed off and inaccessible to everyone except authorized users, connecting to his/her network requires a password or confirmation code. The same goes for networks connecting to the internet. When a user connects to the internet, he/she enters a username and password. These credentials are then verified by a server somewhere on the network, and after authentication, the user is given permission to log onto the web site. If this sounds complicated, just remember that you can put passwords on your own computer using encryption tools.

Why are firewalls used?

Firewalls are often used to protect a company’s proprietary information. Many companies keep sensitive documents like customer records, financial statements, and employee files online, accessible via the Internet. Attackers sometimes try to gain access to these sites by hacking into the administrator account of the website and changing the configuration file. By blocking the entry of unauthorized visitors, any attempts to change the configuration file are thwarted.

Another common use of a firewall is for educational purposes. Schools often block outside websites to prevent students from viewing inappropriate material. Administrators can restrict the amount of bandwidth given to each student, thus limiting the time he/she spends surfing the net.In addition, many businesses use a firewall to protect their business from intruders.

Companies that sell products over the Internet often use firewalls to separate consumers from their personal accounts. If someone tries to access your account without authorization, the firewall stops the attempt and immediately alerts you.


In this article we have discussed Importance of Firewall in a Computer Network. If you like this article share it with your friends and for further query just comment below now.

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Ankush Sheoran
Hey, I am Ankush Sheoran currently working on TheTechnoBug as a content Creator. I am from Hisar, Haryana. There is nothing much to tell about education. According to me " Learning skills is necessary as well as Education". Appart from content writing i have interest in Cyber Security.

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