CompTIA Network+ (N10-008) — Question 16

Which of the following would be used to expedite MX record updates to authoritative NSs?

Answer options

• A. UDP forwarding
• B. DNS caching
• C. Recursive lookup
• D. Time to live

Correct answer: D

Explanation

The correct answer is D, Time to live (TTL), as it defines the duration that a record is cached before a new query is made, which can expedite updates. Options A (UDP forwarding), B (DNS caching), and C (Recursive lookup) do not directly influence the speed at which MX record updates are processed by authoritative name servers.