What Is A Firewall? | How does Firewall Work? | Firewall Tutorial | Network Security

Imagine our houses without a fence or boundary wall, this would make it easier for burglars and thieves to enter and expose our houses to great danger. Increase the likelihood of hackers breaking into our networks to overcome this challenge, much like how border walls protect our homes. A virtual wall helps keep our devices safe and secure from intruders, and such a wall is known as a firewall.

》What is firewall? 

If you think of your network as a dedicated nightclub, then the firewall would be the gatekeeper opening the door and keeping unwanted people out. They filter network traffic based on pre-defined policies, preventing unauthorized users from entering. If you work remotely but are locked out of your company's main systems due to lack of authorization, you've seen the effectiveness of a firewall firsthand.

》Importance of Firewall:

Firewalls are security devices that filter incoming and outgoing traffic within a private network, for example if you are visiting a friend who lives in a gated community, you should first ask the security guard for permission, the security guard will check with your friend whether he may or may not be admitted if all is well. Your access is granted, on the other hand the security guard would not give permission to an intruder trying to enter the same building here, access to access depends solely on the discretion of your friend, the resident, the role of the security guard in this case, it is similar like a firewall.

》How Firewall Works

The firewall acts as a gatekeeper at the entry point of your computer, only welcoming inbound traffic that has been configured to accept firewalls that filter the network traffic on your network and analyze which traffic should be allowed or restricted based on a set of rules, to detect and prevent cyberattacks Your computer communicates with the Internet in the form of network packets that contain details such as source address, destination address and information. These network packets enter your computer through ports. 

The firewall works with a series of rules that are based on the details based on this network. Packets like your source address, a destination address, content and port numbers, only trusted traffic sources or IP addresses can enter your network when you connect your computer to the Internet. There is a high chance that hackers will infiltrate your network. When a firewall comes in to act as a barrier between your computer and the Internet, the firewall rejects the malicious data packet, protecting your network from hackers. Firewall makes quick assessments for malware and other suspicious things Activities, thereby protecting your network from vulnerability to cyber attacks. 

》Types of Firewalls:

Firewalls can be hardware or software. Software firewalls are programs that are installed on every computer, also known as a host firewall, while hardware firewalls are computers that are set up between the gateway and your network. Linksys routers are a good example of a host firewall .

(●) Packet Filtering Firewall:

In addition, there are other types of firewalls that are designed based on the structure and functionality of their filtering methods for the traffic, port number and other aspects of the packet. It is called a Packet Filtering Firewall if the incoming network traffic does not meet the predefined rules that the traffic is blocked.

(●) Stateful Inspection Firewall:

A variant of the Packet Filtering Firewall is the Stateful Inspection Firewall. These firewalls not only examine every network packet, but also check whether this network packet is present Is part of an existing network connection. Such firewalls are also known as dynamic packet filtering firewalls. 

(●) Proxy firewall:

Our next type of firewall is called a proxy firewall. The way you take authority to represent your friend, the proxy firewall mimics you and interacts with the internet that stands between you and the internet, thus avoiding direct connections . This protects the identity of your device and only protects the network from possible attacks if the content of the incoming data packet is protected. 

》Application/Uses of Firewall:

• The firewall can detect malicious actions and prevent your computer from receiving packets of data from malicious sources, as well as preventing cyberattacks.

• Firewalls are also used in schools and offices to restrict user access to certain websites or applications, they are used to prevent access to unauthorized content. 

》Quiz Time:

So here you have a question: which firewall is also known as an application-level gateway? 

(A) Proxy firewall 

(b) Health inspection firewall 

(c) Packet filter firewall 

(d) Dynamic packet filter firewall.

Please think and leave your answers in the comments below. 

》What is Network security?

Most experts define network security as guidelines and practices for taking protective measures to protect the network infrastructure from intrusion, illegal access, modification, misuse, alteration, destruction or collection and unauthorized disclosure of data. a combination of hardware devices, security software, and user knowledge of security procedures and techniques.

Securing your information and therefore the use of security devices that protect our networks from falling victim to deadly cyber attacks is the order of the day. 

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