CCNA: Cisco Certified Network Associate — Question 1211

What is the authoritative source for an address lookup?

Answer options

• A. a recursive DNS search
• B. the operating system cache
• C. the ISP local cache
• D. the browser cache

Correct answer: A

Explanation

The correct answer is A because a recursive DNS search queries multiple DNS servers to find the authoritative answer for an address lookup. The other options, such as the operating system cache, ISP local cache, and browser cache, may contain outdated or incomplete information, making them less reliable for authoritative address resolution.