What is the last step in the DNS lookup process?

• A. The browser makes an HTTP request to the IP address
• B. The DNS resolver caches the IP address
• C. The root server returns the IP
• D. The TLD server verifies the domain

Answer: (A)

When a domain is looked up, the final user-facing action after the IP address is obtained is the browser connecting to that address and sending an HTTP request. The DNS servers (root, TLD, authoritative) and the resolver’s caching happen along the way to resolve the domain to an IP, but they are intermediate steps. The last step in the flow, from the user’s perspective, is the browser using the resolved IP to make the HTTP request to the server.