Various types of firewalls can read data packets at different network levels. To prevent cyberattacks, they block traffic from suspicious sources. These rules are based on various aspects of the packet data, such as their source, destination, content, and so on.

It distinguishes between legitimate and malicious traffic and allows or blocks specific data packets based on predefined security rules. Consider the firewall to be a gatekeeper at your computer's entry point, allowing only trusted sources (or IP addresses) to enter your network.Ī firewall only accepts incoming traffic that has been configured to accept it. Based on a set of rules, it determines which traffic should be allowed or restricted. Within a private network, firewalls filter network traffic. Traffic is monitored at computer entry points known as ports, where information is exchanged with external devices.Īlso Read | Cybersecurity Threats, Attacks and its Types To prevent attacks, firewalls examine inbound traffic based on predefined security rules and filter traffic from unsecured or suspicious sources. A firewall's primary goal is to block malicious traffic and data packets while allowing legitimate traffic to pass through. They are typically used to protect network nodes from egress and influx of data traffic, as well as specific applications.įirewalls protect networks from external attacks by utilizing software, hardware, or cloud-based methods. In this 'what is a firewall' tutorial, you will learn everything you need to know about a firewall and how it acts as a shield to protect your network.įirewalls are cybersecurity tools that monitor incoming and outgoing network traffic and allow or prohibit data packets based on a set of cybersecurity rules.

A firewall is one type of security device that can help you protect your network and devices from intruders. However, there are numerous obstacles to its implementation. Individuals and businesses must secure their information as the number of cybercrimes grows by the day.

What is firewall in computer