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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?
Correct Answer: B
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.