A firewall is a security protocol that protects your internal network from the threats of the internet. It keeps an eye on the data that comes in and out of your network.
Without a firewall, your trusted private network could be at risk of cyberattacks, data breaches, and malware from the public.
To get to grips with how a firewall works, you need to understand how data travels between internet networks. Basically, data moves across the internet in the form of information-filled packets. A firewall inspects these data packets to analyse their:
- Content: The information each data packet contains, such as an image, text, or video.
- Protocol: The language of the data packet, for example, HTTP or TCP.
- Port: The medium that the data is traveling through, such as email, web, or a social media network.
- Source: Where the data is coming from, for example, the IP address or hostname of incoming traffic.
- Destination: Where the data is headed, including the IP address, hostname, and other information that describes where the traffic is going.
Afterwards, the firewall determines whether to let the data packet pass or, instead, to block it based on a set of predefined rules.
To ensure that dangerous data packets are blocked, it’s crucial that you properly set up your firewall, create effective rules, and keep it up to date.
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