Yes, it can be very useful to know which ports are open.
Basically, if you are not running servers, no ports need to be open.
Often people find a number are open and they don't know why.
Your firewall should not respond to any unsolicited traffic.
If it does then you need another one, either hardware or software.
ZoneAlarm is good
When no servers are running that need exposed ports you should get a
stealthed response on every port.
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