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CompTIA Server+ · CompTIA
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DNS can also use other ports for specialized purposes. For example, DNS over TLS (DoT) uses port 853, and DNS over HTTPS (DoH) typically uses port 443 to encapsulate DNS traffic within HTTPS That's why 53 is blocked
They shouldn't have ftp in the answer results. But since they said securing traffic and DNS I think the puposed answer of CD and is what they're looking for, they're just made it a trick question to try to glean more exam fees from people for a cert no one respects.
Then get a new scanner because it is not showing Ports 21 and 23