If you’ve never heard of a firewall before, don’t worry; you’re not the only one. A firewall is a term that many people use, but few understand what it is, what it does, or how to utilise it.

A firewall is the first line of defence against hackers attempting to steal your data or get access to your network. No data can be accessed by unauthorised persons who gain access to your system.


If your identity is authentic and you show no indicators of difficulties, the firewall serves as a gatekeeper, allowing you entry into the system. Firewalls come in two flavours: hardware and software.

If you want to keep your personal information safe from hackers, you must install a firewall on your computer.


What Does a Firewall Do?

If you’re a student in the field of network security, you already know that the firewall is a critical component of any network. If you don’t want certain TCP/IP ports to be opened, you can block specific IP addresses and domain names with the firewall.

In the end, it’s your system that has the power to keep you from doing what you want to do. These days, a firewall isn’t just for home networks; it can also protect corporate networks.

If your system doesn’t have a firewall, network connectivity may be disrupted, and you may observe odd behaviour from some of your software programmes. If you know where the problem is coming from, you can address it correctly and get it fixed quickly.

Firewalls can filter all network traffic, including inbound and outbound. The hardware firewall separates the internal LAN from the outside world (LAN). The software firewall is a software application that is installed on your computer, such as Windows 10’s Windows Defender Firewall.

Filtering of incoming and outgoing traffic is possible through the use of such devices. There are a number of things you must know before putting up a firewall. For those who have never heard of it, we’ve included a detailed explanation of how it works and how to utilise it.

Describe The Firewall’s Operation

1. Filtering of Packets

Incoming and outgoing packet records are kept by packet filtering as a Firewall approach. The IP header is what makes up a Packet Filter. It also tells you where the packet came from, where it’s going, and what kind of data is in it.

This packet’s header, destination address, contents, and source address will be checked by the packet filter’s firewall before it is allowed to pass through the firewall.

In packet filtering, each packet is examined individually before a decision is made on whether or not to transmit it forward or deny it.

To use a packet filter, all traffic must be filtered out, with just the legitimate packets being accepted and the invalid packets being rejected. Static filtering is another name for packet filtering.

2. Gateway at The Circuit Level

Firewalls can also use a circuit-level gateway. In addition to TCP and UDP, the circuit-level gateway includes two additional protocols for securing connections ( UDP ). Basically, it all happens between our transport and application layers in the OSI network model.

Circuit level gateways aid and monitor the handshaking of TCP data packets, as well as helping to fulfil firewall session rules. The circuit-level gateway blocks all incoming traffic for everyone except itself. A software machine is running on the client side that connects to the circuit-level gateway.

3. A Proxy Server

Between your source and destination machines, a proxy serves as a go-between. In addition to serving as a mediator, it improves your network’s efficiency. Proxies function like firewalls because they intercept and route internet traffic for you.

When you make a request, the proxy server establishes a connection with your computer and forwards your request to the internet, where it is processed and returned to you. As previously said, it serves as a go-between between your computer and anything else connected to the internet.

Proxy servers can aid you in a variety of ways, including filtering web material, gaining access to restricted areas like parental controls, downloading and uploading files, and more.

To surf the web anonymously, you can use a proxy service, which prevents your IP address from being shown to the public. Using a proxy server as an example, it will transmit your requests to Google.com and return the data you requested.

Another system may request comparable information from google.com and the proxy server will send the same information to them. This is called “reverse proxying.” As a result, you’ll be able to gather information more quickly.

Using a proxy server, you can block certain websites and ports in order to keep your network safe.

3. Gateway For Application

Another form of firewall is the Application Gateway, which will keep your system safe from hackers.

The application gateway establishes two connections: one from the client to the application gateway, and the other from the application gateway to the web server, which is the second connection.

You can’t get any traffic to your PC since the application gateway sits between your machine and the web server. First, the application gateway verifies whether or not you’ve established a working connection.

If it does, the web server connection is established. Before it forwards, the application gateway checks all of the rules. All other proxies hide the application gateway’s IP address from the outside world, but not in an application gateway. As a result, the network’s security is improved.

Rules For The Firewall

Every detail of a firewall has been explained to us. Let’s go on to the next step in the process of configuring your firewall. It’s as straightforward as installing any other piece of software or hardware.

In order to construct a firewall, you first need to go to the rule page and select the firewall of your choosing.

As a case study, under Windows Defender’s firewall, you can establish a firewall of your choice and fill in specific rules for a programme, for a port, or for an IP address. Wow, isn’t that fantastic?

The firewall you set up will allow or deny incoming packet connections based on the rules you specify in the configuration file.

Defending Your Computer Using a Firewall

A firewall can be installed in any part of a network, regardless of the topology. Lists for configuring firewalls are provided below.

A firewall can be installed on any computer or server. Use your home router if you have one. Your home router’s firewall will keep out unwanted traffic.

A third option is an internal gateway. An internal gateway can be used to keep corporate networks safe from the internet.

When it comes to business networks, firewalls are managed. A home router’s firewall or the firewall settings on your PC can serve as a firewall for your home network.


We’ve covered the basics of firewalls, such as what they are, how to set them up, and what they do. We’ve also spoken about how they’re secured against hackers.

All of the advantages and disadvantages of using a firewall have now been explained to you. A firewall is a critical component of any network since it not only keeps out intruders but also adds an extra layer of defence against malware.

Having a firewall prevents any potential hackers from gaining access to your system in the future. Consequently, you need set up a firewall on your computer, which might be hardware or software, depending on your preferences.

A firewall is a must-have! Everything regarding firewalls and their various forms should now be clear to you. Let us know if you have any other questions or concerns. Have a pleasant day until then. Until then, goodbye!