Why Are Network Firewalls Important?

If you are unsure about the importance of a network firewall, here are some reasons to install it. They serve as the first line of defense against external threats, provide application-layer filtering and detection of intrusion attempts, and are easier to configure than their traditional counterparts. Read more about the importance of a network firewall in your business at Fortinet.com.


Network firewalls are a necessary part of any business’s cyber security strategy. They can prevent unauthorized access to sensitive data and information while ensuring that legitimate traffic passes through. However, the choice of firewall is not always clear-cut. Some network firewalls are more straightforward, while others are designed to withstand the most complex attacks. Network firewalls can be used to protect low-profile web applications or other services on the internet. While some firewalls may monitor all packet content, others may be designed to filter packets based on their source and destination addresses or ports.

Network firewalls can use two different methods to detect and block malware. Packet filtering scans packets to determine if they are harmful. Depending on the type of attack, a packet filtering firewall may block some packets while blocking others. Malware can redirect bandwidth to an unauthorized location. Hardware appliances can provide an extra layer of security, while a software firewall can offer enhanced protection.

The first line of defense against external threats

A network firewall is a crucial component of a secure environment and the first defense against external threats. The firewall controls access among devices. The firewall is usually deployed between two networks, one of which is secure and the other isn’t. In this way, the firewall prevents threats from gaining access to an internal network and causing damage. In some cases, a network firewall can be a combination of both.

Next-generation firewalls (NGFW) combine traditional enterprise firewall functionality with advanced features such as application awareness and intrusion prevention. NGFWs incorporate application-aware security and intent-based networking capabilities. Moreover, NGFWs support secure sockets layer inspection and reputation-based malware detection.

Application-layer filtering

While the first network firewalls only worked at the IP layer, today’s hackers have advanced to attacking applications directly. Unfortunately, this type of attack cannot be detected by traditional packet filtering or stateful firewalls, which analyze ports, protocols, and states but do not dig into the payload. As a result, the networking industry has developed application layer defense mechanisms to combat such attacks. 

In addition to filtering traffic at the IP level, application-layer filtering is also essential for network firewalls. Application-layer proxies act as intermediaries between two networks. For example, suppose a user on the internal network wants to access a Web server located on a separate network. The firewall creates a network connection and establishes a connection between the user and the Web server. Then, the user and server can communicate seamlessly.

Detection of intrusion attempts

One of the many benefits of a network firewall is the detection of intrusion attempts. The IDPs algorithm allows network firewalls to deny traffic coming from an intruder. This prevents the intrusion from completing its goal. It can also alert a trusted network host by sending a RESET command. However, this technique only works if the attacker uses a known attack. Fortunately, this technology is inexpensive and easy to add to a network firewall.

Many of the tactics used by hackers and other intruders are similar. For example, intrusion detection aims to catch any attempted attack and initiate incident response. The worm, a highly sophisticated virus, propagates without human interaction. Another popular method is distributed denial of service.

Protection against malware

A firewall is a security system that watches the data passing between your computer and a network and determines if the data is malicious. Typically, firewalls block data transfers by default, but you can add exceptions if you wish. This can prevent malware infections. In addition to stopping malware, firewalls can block phishing, adware, and ransomware. But how do you protect your network from such threats? Here are some tips.

A good firewall is also an excellent way to protect your computer from identity thieves. Identity thieves are adept at hacking into computers and stealing private information, such as credit card numbers, passwords, and tax records. Some hackers are also willing to hijack your computer and plant malicious computer viruses. A firewall prevents such intrusions and identifies the source of the threat, which may be harmful to your system. A firewall can also alert you when malicious software is detected.