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How to size a firewall

I am new to firewall appliance.  What is the important factor when purchase a firewall appliance?  What do I based on to size the appropriate firewall for my network?
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V K
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First and foremost, consider the functionality of the firewall.
Ask yourself: do you need to emphasize network throughput or enhanced security features?

One major point of differentiation between firewalls is their ability to perform application-layer inspection. Many firewalls simply don't have application-layer inspection, while others implement basic functionality (such as URL filtering).

Finally, consider the vendor itself. When investing in a firewall product, you're making a long-term decision. The financial commitment is only the tip of the iceberg; your firewall administrators will invest significant time and energy building and customizing a rule base for that particular product. In general, rule bases are not portable between platforms, so any future platform change will require a substantial commitment of human resources.
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