Which of the following port numbers are associated with email traffic? (Select two).

The correct answer is B. 25 D. 110. Port 25 is used by SMTP (Simple Mail Transfer Protocol), which is the standard protocol for sending and relaying email between mail servers. Port 110 is used by POP3 (Post Office Protocol version 3), which is used by email clients to retrieve/download messages from a mail server.

Networking

Question

Options

A23
B25
C67
D110
E137
F443

How the community answered

(36 responses)

A
6% (2)
B
92% (33)
E
3% (1)

Explanation

Port 25 is used by SMTP (Simple Mail Transfer Protocol), which is the standard protocol for sending and relaying email between mail servers. Port 110 is used by POP3 (Post Office Protocol version 3), which is used by email clients to retrieve/download messages from a mail server. The other options are: Port 23 (Telnet), Port 67 (DHCP - dynamic IP address assignment), Port 137 (NetBIOS Name Service), and Port 443 (HTTPS - secure web traffic). None of those are associated with email.

Topics

#Port numbers#Email protocols#SMTP#POP3

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