CREST Practitioner Security Analyst (CPSA) Practice

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The X.400 Standard is connected to which port number?

103
25
110
8080

The correct answer is: 103

The X.400 Standard, which pertains to a set of protocols for electronic mail (email) messaging that was established by the International Telecommunication Union (ITU), is primarily associated with port number 103. This port is used for the X.400 Message Handling System (MHS) to enable communication between different mail systems. Understanding the significance of port 103 is crucial, as it differentiates X.400 from other email protocols such as SMTP (which operates on port 25) and POP3 (which operates on port 110). The designation of port 103 for X.400 highlights its unique role within the broader framework of email messaging standards and illustrates how different protocols have their specific designated ports to facilitate communication.