CREST Practitioner Security Analyst (CPSA) Practice

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What is the function of a Mail Exchanger (MX) Record?

To route web traffic
To determine servers handling a domain's incoming email
To manage IP address assignments
To identify authoritative servers for a domain

The correct answer is: To determine servers handling a domain's incoming email

The function of a Mail Exchanger (MX) Record is to determine which servers are responsible for handling a domain's incoming email. When an email is sent to a domain, the email server uses the MX Record to find out the appropriate mail server that should receive the email for that domain. The MX Record contains the domain name of the mail server along with a priority value indicating the order in which the servers should be used for email delivery. If there are multiple MX Records for a domain, email delivery will attempt to go through the server with the highest priority first. This mechanism is critical in ensuring that emails are routed efficiently and correctly to their intended destinations based on the sender’s domain. It facilitates proper communication through email, a fundamental function in internet services. Understanding the role of MX Records is essential for anyone involved in email system configuration and management.