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Hardware firewalls are appliances designed to provide a perimeter defence to your Local Area Network onsite. Software firewalls provide different security benefits and drawbacks. They protect only the device running the software, usually a desktop computer. If you are running Windows10, there is no need to spend any more , since Windows Defender is a very good product that will protect your computer for free.
Given that network startup after power or network interruption is a critical vulnerability period for a small, remote location to be protected, it is best that a hardware firewall is in place in library networks.
Five firewall options for libraries are listed below. There are many more available.