Which protocol is used to translate a domain name into an IP address?

Which protocol is used to translate a domain name into an IP address?

• A. HTTP
• B. DNS
• C. TCP
• D. TLS

Answer: (B)

The main idea here is name resolution. DNS, the domain name system, is the mechanism that translates human-friendly domain names like example.com into the numerical IP addresses computers use to locate servers. When you type a site in your browser, your device asks a DNS resolver to find the IP address for that domain. The resolver contacts a hierarchy of DNS servers, ultimately receiving the IP address that corresponds to the domain, so your browser can connect. DNS typically uses UDP on port 53 for queries, with TCP used for larger responses or zone transfers. The other options aren’t about turning names into addresses: HTTP is the protocol for requesting web content once a connection is established; TCP is the transport protocol that provides reliable delivery but doesn’t resolve domain names by itself; TLS is the security layer that encrypts that data.

The main idea here is name resolution. DNS, the domain name system, is the mechanism that translates human-friendly domain names like example.com into the numerical IP addresses computers use to locate servers. When you type a site in your browser, your device asks a DNS resolver to find the IP address for that domain. The resolver contacts a hierarchy of DNS servers, ultimately receiving the IP address that corresponds to the domain, so your browser can connect. DNS typically uses UDP on port 53 for queries, with TCP used for larger responses or zone transfers.

The other options aren’t about turning names into addresses: HTTP is the protocol for requesting web content once a connection is established; TCP is the transport protocol that provides reliable delivery but doesn’t resolve domain names by itself; TLS is the security layer that encrypts that data.