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What is it? Firewalls can be customised, you are able to add or remove filters based on several conditions. These include: IP addresses, domain names, IP, HTTP, TCP and FTP. Where is it used? Firewall configuration is mainly used when your system has an internet connection. Why? You would configure a firewall because then you can choose what network packets come in and out of your computer. Benefits? Configuring your firewall properly can be very beneficial as it can greatly increase the security of your system. Disadvantages Configuring a firewall can be difficult to maintain. This is because if you want to filter each packet of data, then this can have a effect on your systems performance, as it will now have to observe every packet of data.