A user reports that they can access websites by typing in IP addresses but not by using their domain names (e.g., www.google.com). Which port number is most likely associated with the service that is malfunctioning?
53
25
3389
443
The Domain Name System (DNS) is responsible for resolving human-readable domain names into machine-readable IP addresses. DNS queries typically use port 53. Since the user can access sites by IP address, basic network connectivity is working, but name resolution is failing. Port 25 is for Simple Mail Transfer Protocol (SMTP), port 443 is for Hypertext Transfer Protocol Secure (HTTPS), and port 3389 is for Remote Desktop Protocol (RDP).
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