Normally a client sends a DNS Query using UDP Protocol over Port 53. If it does not get response from a DNS Server, it must re-transmit the DNS Query using TCP after 3-5 seconds. So we can say DNS prefers using UDP to TCP -> the answer should be UDP.
Itis UDp So Answer IS “D”
It’s UDP
Item D
This is incorect as DNS uses both udp and tcp
wrong ques…it uses both…
DNS uses both UDP and TCP port 53. Please edit the question correctly.
Normally a client sends a DNS Query using UDP Protocol over Port 53. If it does not get response from a DNS Server, it must re-transmit the DNS Query using TCP after 3-5 seconds. So we can say DNS prefers using UDP to TCP -> the answer should be UDP.