What is a Firewall? Why is it important?

What is firewall, and what are its uses is something that is often asked by companies who are unaware of the various benefits that it offers

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What is firewall

What is firewall and what are its benefits is a question that is often asked by companies. A firewall is a computer network security device that limits internet traffic entering, leaving, and moving within a secure network. This software, or dedicated hardware-software unit, functions by selectively allowing or blocking data packets. It is typically intended to protect you from malicious activity and to protect you from everyone engaging in unauthorized online activities, whether they are inside or outside of a personal network.


Firewalls block unauthorized access to networks using firmware or software. The firewall examines and blocks incoming and outgoing traffic using a set of rules. Additionally, firewalls are used to calm a computer community. Fencing your home protects it and keeps trespassers at bay. Firewalls are structures that prevent unauthorized access to a community. In order to recognize and stop cyber-attacks, it may be hardware or software that filters the incoming and outgoing traffic within a private network.

What is Firewall?

Firewalls can be thought of as gated borders or gateways that regulate the movement of web content in a private community. The phrase refers to the idea that physical barriers can contain a fire until emergency services can put it out. According to an assessment, community security firewalls are for website visitor control and are typically designed to slow the spread of internet threats.


Firewalls create "choke factors" to direct website visitors to a point where they are then evaluated based on a strict set of programmed parameters and taken appropriate action. Some firewalls also keep track of the connections and site visitors in audit logs to show what has been permitted or blocked.

Firewalls are frequently used to secure a private network's perimeters. Firewalls are one safety tool in the larger subset of consumer access control as a result. These boundaries are typically set up on either dedicated network computers or the user computers and other endpoints themselves.

People and organizations need to secure their data due to the wide variety of cybercrimes that are increasing every day. But enforcing the same is difficult in many situations. One such security measure that allows you to protect your community and tool from outsiders is a firewall.


Key Uses of Firewall

The main applications for firewalls include:

 • Both corporate and client environments can use firewalls. Firewalls are installed on the network perimeter of businesses to protect against both outside threats and insider threats. They can be included in cybersecurity devices for modern agencies as part of a Security Information and Event Management (SIEM) method.


• Firewalls have the ability to perform logging and audit functions by identifying patterns and enhancing policies through the use of updating them to counteract immediate threats.

• Cable modems with static IP addresses, home networks, and Digital Subscriber Lines (DSL) can all use firewalls. Firewalls are capable of easily removing unwanted traffic and alerting users to intrusions.

How Do Firewalls Operate?


Creating a border between an external network and the guarded network, where the firewall inspects all packets (bits of data used for internet transfer), is the firewall's most crucial function. A firewall uses a set of pre-configured rules to identify benign and malicious packets after the inspection is complete.

No matter if they are contained in a rule set or not, the firewall accepts such packets in order to prevent them from entering the protected network.

The information source, destination, and content are all included in this packet form. All of them and the rule sets may vary at every level of the network. Firewalls examine these packets and rewrite them in accordance with the rules to inform the protocol where to send them.


Firewalls block network traffic within a private network, as previously mentioned. Based on a set of regulations, it determines which visitors should be permitted or restricted. Consider the firewall as a gatekeeper at the point where your laptop enters the network, who simplest allows trusted sources, or IP addresses, to enter.

Only incoming visitors that have been set up to be accepted are welcomed by a firewall. It makes a distinction between legitimate and malicious traffic and, depending on the connected security rules, either permits or disallows specific data packets.

These policies are entirely based on various elements revealed through packet information, such as their source, destination, content, and so forth. In order to prevent, they block site visitors coming from suspicious sources.


Firewalls' various types

Hardware or software firewalls are both options. Software firewalls are installed programs that control network traffic using programs and port numbers. They are connected to each computer. Hardware firewalls, meanwhile, are the devices installed in the space between the gateway and your neighborhood. The term "cloud firewall" is also used to describe a firewall that has been added via a cloud solution.

Based solely on their visitor filtering methods, shapes, and functions, there are a few different types of firewalls. Firewalls come in various varieties, including:

• Filtering of packets

A packet filtering firewall regulates the information flow into and out of a network. It decides whether to allow or deny the data transfer based on the packet's source address, destination address, software protocols being used to transfer the data, and so forth.

• Firewall for proxy services

Messages sent at the application layer are filtered by this type of firewall to safeguard the network. A proxy firewall acts as the entry point for a specific piece of software into all other communities.

Inspection that is Stateful

Based solely on country, port, and protocol, such a firewall either allows or blocks community site traffic. Here, the decision-filtering process is entirely determined by the policies and context that the administrator has described.

• UTM Firewall (Unified Threat Management)

A UTM device typically integrates, albeit loosely, the capabilities of an intrusion prevention system, an antivirus program, and a stateful inspection firewall. It might also include extra services, and cloud control is frequently included. Applying UTMs is made easy and seamless by design.

Firewalls of the Future (NGFW)

NGFW that is threat-focused superior threat detection and mitigation firewalls. They could identify evasive or suspicious behavior using the correlation of community and endpoint events. In order to identify applications like Skype or Facebook and to enforce security guidelines specific to the type of application, Next-Generation Firewalls are used to inspect packets at the application level of the TCP/IP stack. To find and stop malware and other threats in files, Next-Generation Firewalls also include sandboxing technologies and threat prevention tools like intrusion prevention systems (IPS) or antivirus.

Network Security in the Future

The largest volume of traffic in a data center is moving from server to server. In the last few years, virtualization and trends in converged infrastructure have increased east-west traffic. In order to adapt to this change, some enterprise organizations have moved away from the standard three-layer data center architectures and toward different types of leaf-spine architectures. Some security experts issued a warning following this change in architecture, stressing the crucial role firewalls must play in keeping the network secure in a risk-free setting. Firewalls are therefore crucial and have a bright future. Firewalls may, however, be replaced in the future by many sophisticated alternatives.


A firewall can improve privacy by blocking access to services and the Domain Name Service in addition to lowering risks to the internal network. A firewall can also be used to record network usage statistics and access to and from the internal network. The most crucial element of basic security is a firewall, which requires authentication of all users and keeps track of all incoming and outgoing traffic and block the suspicious traffic based on policies and rules.

The article has been written by Dr. Mukul Gupta, Director-Finance & Marketing, B M Infotrade Pvt. Ltd