John finds in the company logs that there has been continuous scans on the company’s UDP port 53. Which of the following services does this port map to?
A.
SMTP
B.
DNS
C.
FTP
D.
HTTP
Explanation:
Sending a DNS query to port 53 will result in a response, if a DNS
server is present. Port 25 maps to SMTP, port 21 and 20 map to FTP and port 80 maps
to HTTP.