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Exam N10-008 topic 1 question 645 discussion

Actual exam question from CompTIA's N10-008
Question #: 645
Topic #: 1
[All N10-008 Questions]

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 lauren2wright at Nov. 15, 2023, 2:47 p.m.

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salah112
Highly Voted 5 months ago
Selected Answer: B
B. Reduce the TTL record prior to the MX record change. The Time-to-Live (TTL) value in DNS records determines how long the information is cached by DNS resolvers. When making changes to critical DNS records like the MX (Mail Exchange) record, it's a good practice to reduce the TTL in advance. This way, when you make the actual change, the updated information propagates more quickly through the DNS infrastructure, minimizing downtime and potential issues.
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lauren2wright
Most Recent 5 months, 3 weeks ago
B. Reduce the TTL (Time To Live) record prior to the MX record change. Explanation: TTL (Time To Live): TTL is a value in a DNS record that determines the amount of time it can be cached by DNS resolvers and other devices on the internet. When making changes to DNS records, reducing the TTL beforehand helps minimize the time it takes for the changes to propagate throughout the internet. MX Record Change: Changing the MX (Mail Exchange) record directs email traffic to the specified mail server. However, DNS changes take time to propagate across the internet due to caching. If the TTL is set too high, old records may be cached for an extended period, leading to email delivery issues.
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