What happens if DNS cannot resolve a domain name?

What happens if DNS cannot resolve a domain name?

• A. The browser fails to connect to the server, and you may see an error like "DNS_PROBE_FINISHED_NXDOMAIN".
• B. The browser automatically uses IPv6 only without error.
• C. The browser redirects to a default homepage.
• D. The browser downloads a backup DNS record from the cache automatically.

Answer: (A)

DNS translates a domain name into an IP address. When that step fails, the browser has nothing to connect to, so the connection can’t be established. The error DNS_PROBE_FINISHED_NXDOMAIN appears because the domain name doesn’t have a corresponding entry in DNS. Since there’s no IP address to reach, there’s no attempt to use IPv6, no redirect to a homepage, and no automatic retrieval of a cached DNS record to fix the problem. The missing address is what stops the request from leaving the client.

DNS translates a domain name into an IP address. When that step fails, the browser has nothing to connect to, so the connection can’t be established. The error DNS_PROBE_FINISHED_NXDOMAIN appears because the domain name doesn’t have a corresponding entry in DNS. Since there’s no IP address to reach, there’s no attempt to use IPv6, no redirect to a homepage, and no automatic retrieval of a cached DNS record to fix the problem. The missing address is what stops the request from leaving the client.