Firewall in Computer Networks: Definition, Types & Importance

Cyberattacks are no longer rare, targeting not only large enterprises. Today, it is the small and medium-sized businesses that are targeted the most by cyberattacks such as ransomware, phishing, and data breaches. The business network is prone to many online threats when you run a growing startup or an established organization. 

Most businesses juggle so many tasks at present that they pay little heed to this at the start and then regret it later on. This is why there’s a firewall in a computer network to keep the network safe from cyberattacks. It is the firewall only that keeps a check on the incoming and outgoing traffic, blocks the malicious traffic, and takes note of the communication taking place. 

Otherwise, businesses’ data, applications, and devices are vulnerable to unauthorized access when there’s no properly configured firewall in a computer network. This blog tells you everything you need to know about the firewall in a computer network, how it works, and why every business needs a firewall, irrespective of size. 

Firewall in a Computer Network 

A firewall in a computer network is a network security system that monitors the network traffic and controls the traffic based on the pre-defined network rules. It acts like a digital security guard that is positioned at the entry point of your network. It keeps a check on everything that enters and exits your network. 

A barrier is created between your internal network and the external network by the firewall, which in turn prevents unauthorized access while allowing only authorized communication. The two types of firewall are hardware firewall and software firewall. 

The hardware firewall is a physical device that is installed between your network and the internet gateway, whereas the software firewall is a program installed on individual devices to monitor the traffic. 

But here’s the thing. The businesses these days handle tons of sensitive information, due to which, relying solely on antivirus software is not the right approach. It is key to have a dedicated firewall in a computer network to filter the traffic before it enters your internal systems. 

How Does a Firewall in a Computer Network Work? 

Most businesses have no idea about how important it is to have a firewall, simply because they don’t know how it works. The moment businesses receive or send data over the internet, the data is broken into small units, which are called packets. The following is included in each packet: 

• Destination IP address
• Protocol information
• Source IP address
• Port number
• Actual data

A firewall’s job is to inspect these packets and then verify them with the predefined security rules. Here’s what happens next. 

Traffic filtering 

The foremost thing that a firewall does is traffic filtering. When your network receives the traffic, the firewall decides whether to allow the packet, block it, or flag it for further inspection. If the firewall suspects that it’s a hacker, then it blocks the traffic. 

Inbound and outbound monitoring

The next step is inbound and outbound monitoring. The firewall controls both inbound and outbound monitoring. Most businesses think that threats only come from external threats, but the reality is that threats can happen because of both external threats and compromised internal devices.

Decisions based on rules

The rules such as allowing the HTTP/HTTPS traffic, blocking unknown IP addresses, and restricting access to the sensitive servers, the administrators configure these rules. The modern firewalls also perform deep packet inspection and analyze the traffic, not just the header information. 

A firewall analyzes the traffic patterns and prevents suspicious communication before it turns into a security breach. 

Why Are Firewalls Important for Businesses? 

A firewall in a computer network is not simply a technical component but more than that. It is a security control that looks after your entire digital ecosystem. It is a primary defense layer for businesses that rely the most on emails, cloud applications, customer databases, payment systems, and internal communication tools. 

But this is not all. Here are the points that show why firewalls are important for businesses and why you shouldn’t miss this. 

Protects from Attacks

Cyber threats have become advanced these days, but the most damaging ones are malware and ransomware. These cyberattacks can encrypt the business data, shut down routine operations, and cause reputational damage to businesses in the long-term. 

It is a firewall in a computer network that protects businesses from such attacks. The malicious IP addresses, the downloads that seem suspicious, and the unauthorized applications, the firewall takes note of all these and blocks them. The firewall also integrates with the intrusion prevention systems to ensure your network stays safe from attacks. 

Prevents unauthorized access 

The businesses on implementing the firewall in their systems can prevent their network from unauthorized access. The hackers are always looking out for the business ports that have open ports, weak credentials, and exposed servers. 

This is what a firewall in a computer network caters to and closes the unnecessary ports. The firewall makes sure that only the approved traffic is allowed and not the rest. Besides this, it also ensures the following. 

• It controls the remote access. 
• Hides the sensitive servers from public exposure. 
• Give access to the internal resources only to authorized users. 

A configured firewall blocks the access attempt made by someone to access your business’s internal database server, which reduces the risk of data breaches to the bare minimum. 

Safeguards sensitive data

Every business handles sensitive data and information, be it customer information, employee information, financial records, contracts, and confidential documents. If by any means this data got exposed, the consequences would be legal penalties, customer loss, and financial damage. 

This is where the firewall helps businesses to safeguard sensitive data. It monitors the traffic, restricts access to specific internal systems only, enforces strict access control policies, and logs and tracks unusual activity. The firewall detects and blocks the transfer when an employee tries to send the bulk data outside the organization. 

Secure remote work and cloud environments

Most employees access the company systems from different locations in a remote and hybrid work environment. But this expands the attack surface. A firewall in a computer network supports the following. 

• Encrypted traffic. 
• Secure VPN connections.
• Cloud application monitoring.
• Multi-factor authentication policies.

The modern firewalls differ a lot from the traditional firewalls. The modern firewalls offer the application level visibility. This means that businesses get to control which cloud service the employees can access and how they interact with it. Otherwise, the remote connections are entry points for the cybercriminals. 

Regulatory and compliance requirements

Then comes the next reason, which makes the firewall utmost important for businesses. The firewall helps businesses to ensure regulatory and compliance requirements. Many industries are required to follow the strict cybersecurity standards, such as healthcare, finance, and e-commerce. 

It is because the compliance frameworks require the network security controls, which makes a firewall in a computer network much needed. With the help of firewalls, businesses can maintain a secure network architecture, log traffic activity for audits, showcase proactive risk management, and prevent incidents that expose businesses’ data. 

The businesses not implement proper firewall protection become prone to legal penalties and regulatory fines. 

Control internal threats

Another reason why a firewall has become key for businesses is that it helps them to control internal threats and employee activity. Most businesses think that the cyberthreats do not always come from outside. The risks also come internally at times. The employees, at times, may: 

• Click on phishing links.
• Access restricted systems. 
• Download unsafe software. 
• Attempt to transfer sensitive data. 

The policies include blocking high-risk websites, limiting user permissions, monitoring unusual traffic behavior, and restricting access to unauthorized applications enable the businesses to stay safe from internal threats. 

Improves network performance and scalability 

The firewall is mainly for security purposes, but these also contribute to improved network performance and scalability. The advanced firewalls can do the following: 

• Focus on critical business applications. 
• Limit the bandwidth use for the non-essential apps.
• Prevent traffic congestion caused by malicious bots. 
• Detect and stop Distributed Denial-of-Service (DDoS) attacks.

FAQs

3 signs that tell my business needs a firewall.

The signs that indicate it’s time to upgrade the firewall are mentioned below. 

• Frequent network slowdowns. 
• Rely on outdated hardware. 
• Lacks centralized monitoring. 

How to choose the right firewall for my business?

The businesses need to take note of certain factors to choose the right firewall for their business. This includes 

• Business size
• Number of users 
• Type of data 
• Compliance requirements 

What are the common firewall configurations in business networks? 

There are multiple ways a firewall in a computer can be configured, as mentioned below. 

• Perimeter firewall. 
• Network segmentation. 
• Cloud firewall integration. 

Are firewalls important for businesses? 

Absolutely. The firewalls have a lot in store for the businesses, such as- 

• Protects from cyberattacks
• Prevents unauthorized access. 
• Regulatory compliance 
• Controls internal threats 

Final Say 

This is how a firewall in a computer network works and how crucial it is for businesses in today’s times. The firewall not only protects you from cyberattacks but also brings you peace of mind so that you can focus on what matters most to you instead of worrying about cyberattacks. In case you still have some questions, you can reach out to IT in DFW.