WBJECA 2025 — Computer PYQ

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Question

WBJECA 2025 — Computer PYQ

WBJECA | Computer | 2025

Which application layer protocol is primarily used for sending email?

Choose the correct answer:

Explanation

In the context of the Application Layer of the OSI model, different protocols handle different aspects of email communication.

SMTP (Simple Mail Transfer Protocol): This is the standard protocol used for sending (pushing) email from a client to a mail server, or between mail servers.
IMAP (Internet Message Access Protocol) & POP3 (Post Office Protocol version 3): These are used for retrieving (pulling) email from a mail server to a client.
FTP (File Transfer Protocol): This is used for transferring files between a client and a server, not specifically for email.

To understand the roles of these protocols in the email lifecycle, we can represent their functions as:

$Email Transmission (Sending) = {SMTP}$

$Email Reception (Retrieval) = {IMAP, POP3}$

Because the question specifically asks for the protocol used to send email, SMTP is the correct choice.