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The underlying Transport layer protocol used by SMTP is ________

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in Computer Network by (190k points)
The underlying Transport layer protocol used by SMTP is ________

(a) TCP

(b) UDP

(c) Either TCP or UDP

(d) IMAP

I had been asked this question in an international level competition.

Asked question is from SMTP in division Application Layer of Computer Network

1 Answer

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Right option is (a) TCP

To explain: TCP is a reliable protocol, and Reliability is a mandatory requirement in e-mail transmission using SMTP.

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