What action does a DNS server take if it does not have an entry for a requested URL?

What action does a DNS server take if it does not have an entry for a requested URL?

• The server drops the request.
• The server returns a "page not found" response to the client.
• The server checks with another DNS server to see if it has an entry.
• The server assigns a temporary IP address to the name and sends this IP address to the client.

Explanation: When a client types a URL to visit a web server, the browser sends a request to the DNS server with the IP address configured on the computer. When the DNS server receives the request, it checks its table to determine the IP address associated with that web server. If the local DNS server does not have an entry for the requested name, it queries another upstream DNS server. When the DNS server learns the IP address, that information is sent back to the client.

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