DNS lookups that are less than 512 bytes are typically perfo

DNS lookups that are less than 512 bytes are typically performed on which of the following protocols and ports?

A. UDP 53

B. UDP 69

C. TCP 53

D. UDP 161

Solution

DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port 53 is not accepted.

DNS lookups that are less than 512 bytes are typically performed on,

Answer: A. UDP 53