Cisco Certified Network Associate (CCNA) Practice Exam

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What is the TCP port number for POP3?

TCP 23
TCP 25
TCP 50
TCP 110

The correct answer is: TCP 110

The Transmission Control Protocol (TCP) port number for Post Office Protocol version 3 (POP3) is 110. POP3 is a standard protocol used by email clients to retrieve emails from a remote server. When a user checks their email, the email client connects to the mail server using this specified port to access the messages stored on it. In the context of common mail protocols, TCP port 25 is typically used for Simple Mail Transfer Protocol (SMTP), which is the protocol for sending emails, whereas TCP port 23 is used for Telnet, a protocol for text-based communication over the network. TCP port 50 does not have a widely recognized application associated with it in terms of email services. Hence, the selection of TCP port 110 directly corresponds to the function and purpose of POP3 in email retrieval.