Community QuestionSeen on 6 CBTs

SMTP - Simple Mail Transfer Protocol

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Answer

Converts names to IP addresses - udp/53 www.professormesser.com = 162.159.246.164 These are very critical resources Usually multiple DNS servers are in production

3 of 6 indexed CBT versions give this answer·Answer index rebuilt Aug 16, 2026

The indexed versions don't agree on this one

This question appears on 6 CBT versions we've indexed, and they don't all give the same answer. Exam editions change and answer keys get re-cut, so more than one of these was correct on the test it came from. Here is each of them, and how many versions give it.

3 of 6 versionsmost versions

Converts names to IP addresses - udp/53 www.professormesser.com = 162.159.246.164 These are very critical resources Usually multiple DNS servers are in production

Comptia A+ Course Notes · Comptia A+ Notes · Comptia Notes

1 of 6 version

The protocol used to send mail between hosts on the Internet. Messages are sent over TCP port 25.

Comptia Certmaster Practice For Network+

1 of 6 version

A communications protocol that enables sending email from a client to a server or between servers. tcp/25 IMAP, POP3

Dr Messer Comptia

1 of 6 version

tcp/25, server to server email transfer, also used to send mail from device to a mail server

Professor Messer Network Plus

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