Networking Question of the Week

Every other week we post TCP/IP, subnetting, and other networking certification questions to help you prep for the exams.

Which IP application does the well-known port number 23 reference?

  1. FTP
  2. SMTP
  4. TFTP


The correct answer is 3.

FTP is referenced by 20, SMTP is referenced by 25, and TFTP is referenced by 69.

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TCP/IP Networking
Understanding Network Fundamentals

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