Where does the browser obtain the IP address after you enter a URL?

Where does the browser obtain the IP address after you enter a URL?

• A. DNS
• B. TCP
• C. SSL/TLS
• D. HTML parser

Answer: (A)

When you type a URL, the browser needs a numeric address to reach the server. That mapping from a human-friendly name to a number is provided by the Domain Name System. The browser (often via the local resolver) checks caches and, if needed, asks DNS servers to resolve the domain to its IP address. Once the IP is known, the browser can establish a connection to that address. The other items aren’t about finding the address: TCP is the protocol used to connect after the address is known, SSL/TLS handles encryption for HTTPS, and the HTML parser works on page content after the connection is made.

When you type a URL, the browser needs a numeric address to reach the server. That mapping from a human-friendly name to a number is provided by the Domain Name System. The browser (often via the local resolver) checks caches and, if needed, asks DNS servers to resolve the domain to its IP address. Once the IP is known, the browser can establish a connection to that address. The other items aren’t about finding the address: TCP is the protocol used to connect after the address is known, SSL/TLS handles encryption for HTTPS, and the HTML parser works on page content after the connection is made.