I am kinda young in the LINUX world and I have lots of questions to ask.
So, I thought this was the best place to ask them.
I know that Red Hat comes with a firewall. When you activate it how do you
know the firewall is blocking all of the ports. For example, if you want to
block people from ftping to or from your site you tell the firewall to block
ports 22 and 23 (something like that). I understand that but what I don't
understand is that there are more ports that are being used by the system
and the system is waiting for a call by the programs using the ports. So,
how do you know that ALL the ports are being blocked so that ONLY valid
usage is being used and no hackers in your system?
William
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