Which network protocol does DNS use?
A.
FTP
B.
TFTP
C.
TCP
D.
udp
E.
scp
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Correct answers C, D. DNS uses port 53 on both TCP and UDP.. And by the way, they’re not Network layer protocols. They’re transport (or host-to-host) layer protocols. If the question asked Which protocol DNS PREFER to send dns queries then the answer would be UDP. But if a packet will be over 512 bytes, then the server will notify the client to use TCP.
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