I am college student and studying computer science and I want to know what is the firewall exactly use for and its it necessary for each computer and also want to know how can I check my firewall l working and if I have more than one computer then is it necessary to have firewall in each computer? I want to know about how to use multiple firewall and where is it used? Can I create my own private firewall and how can I update it? If anyone has idea then please replied me.
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