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It just means there are no rules set in place, and that default rules will apply, which are whatever is reported by sudo ufw status verbose. If you were to set a rule, it would display, along with its id.
No, defaults apply to all incoming / outgoing or routed traffic that doesn't match a specific rule, and the traffic can be allowed, denied or rejected; there must be a default behavior set for each type of traffic, and the default behavior can be changed using sudo ufw default allow|deny|reject [incoming|outgoing|routed]; it makes little sense to number these default "rules", I wouldn't even call them "rules", they just define how the firewall should behave when no rule matches.
sudo ufw status verbose
. If you were to set a rule, it would display, along with its id.sudo ufw default allow|deny|reject [incoming|outgoing|routed]
; it makes little sense to number these default "rules", I wouldn't even call them "rules", they just define how the firewall should behave when no rule matches.