1.

The underlying Transport layer protocol used by SMTP is ________(a) TCP(b) UDP(c) Either TCP or UDP(d) IMAPI had been asked this question in an international level competition.Asked question is from SMTP in division Application Layer of Computer Network

Answer»

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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