CCNA: Cisco Certified Network Associate — Question 1167

Which function does an iterative DNS query serve in the domain name resolution process?

Answer options

• A. Obtain information directly from all root DNS servers configured within the scope.
• B. Encrypt communication automatically between DNS clients and servers.
• C. Allow a DNS client to contact several DNS servers until the correct information is found.
• D. Update records dynamically across multiple DNS servers at the same time.

Correct answer: C

Explanation

The correct answer, C, describes how an iterative DNS query allows a client to ask multiple DNS servers for the correct information, stopping once it receives a valid response. Option A is incorrect because an iterative query does not contact all root DNS servers simultaneously; it follows a specific query path. Option B is wrong since iterative queries do not inherently encrypt communication, and option D is inaccurate as dynamic updates are not part of the iterative query process.