What port number is associated with DNS services?

The correct port number associated with DNS (Domain Name System) services is 53. DNS is crucial for resolving human-friendly domain names into IP addresses, allowing for communication over the internet. It operates primarily using the User Datagram Protocol (UDP) on port 53 for most queries, while TCP can be used for tasks such as zone transfers.

Understanding the context of the other port numbers helps clarify why 53 is the correct choice. Port 25 is typically used for SMTP (Simple Mail Transfer Protocol), which handles email sending. Port 80 is the standard port for HTTP (Hypertext Transfer Protocol), facilitating web traffic. Finally, port 443 is used for HTTPS (HTTP Secure), which adds a layer of security to web communications. Thus, recognizing the specific functions associated with these ports makes it clear why port 53 is designated for DNS services.