Apple Certified Support Professional (ACSP) Practice Exam

The main function of DNS, or Domain Name System, is to translate human-readable domain names into IP addresses that computers can understand. When you type a website address, like www.example.com, your device uses DNS to look up the corresponding IP address (like 192.0.2.1) to locate the server hosting that website. This process is crucial for enabling users to access websites using easy-to-remember names rather than numerical IP addresses.

The other options represent different networking functions. For instance, email retrieval is handled by protocols like IMAP or POP3, while VPNs are established using different technologies that work to create secure connections over the Internet. Network security settings are managed through firewalls and other security tools, not by DNS. Thus, the ability of DNS to facilitate the translation between domain names and IP addresses makes it an essential component of network functionality.