Question

Typically the TCP port used by SMTP is _________

(a) 25

(b) 35

(c) 50

(d) 15

The question was posed to me by my school teacher while I was bunking the class.

I want to ask this question from SMTP topic in section Application Layer of Computer Network

Answer 1

The correct choice is (a) 25

To explain I would say: The ports 15, 35 and 50 are all UDP ports and SMTP only uses TCP port 25 for reliability.