What network service is associated with port 53?

Port 53 is associated with the Domain Name System (DNS), which is a critical network service used to translate human-readable domain names (like www.example.com) into IP addresses that computers can understand and use to communicate with each other. DNS operates by responding to queries regarding domain name resolutions, allowing users to access websites and services using easy-to-remember names instead of numerical IP addresses.

The other services mentioned operate on different ports and serve different purposes: FTP (File Transfer Protocol) primarily uses port 21 for transferring files, SNMP (Simple Network Management Protocol) typically communicates over port 161 for network management tasks, and SSH (Secure Shell) uses port 22 for secure remote logins and command execution. Thus, DNS being the service that operates on port 53 distinguishes it as the correct choice in this context.