Exam N10-009 topic 1 question 138 discussion

Actual exam question from CompTIA's N10-009

Question #: 138
Topic #: 1

A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email. Which of the following should the engineer have done to prevent the issue from occurring?

A. Change the email client configuration to match the MX record.
B. Reduce the TTL record prior to the MX record change.
C. Perform a DNS zone transfer prior to the MX record change.
D. Update the NS record to reflect the IP address change.

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Suggested Answer: B 🗳️

by HeatSquad77 at Jan. 6, 2025, 5:43 p.m.

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HeatSquad77

5 days, 9 hours ago

Selected Answer: B

B. Reduce the TTL record prior to the MX record change. TTL (Time to Live) determines how long DNS records are cached by resolvers and other DNS servers. By reducing the TTL value prior to making the MX record change, the network engineer would have ensured that the new MX record would be propagated faster, reducing the time it takes for DNS servers and mail clients to recognize the change.

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Exam N10-009 topic 1 question 138 discussion

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