SMTP protocol is used to send an email from source to destination. Which of the Transport layer protocol support SMTP?

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BlackTom AI · Accepted Answer

The question asks which Transport Layer protocol supports SMTP.
Option a: TCP. SMTP runs over TCP because it requires reliable, ordered delivery of email data with flow control, which TCP provides. This makes TCP the appropriate transport protocol for SMTP.
Option b: POP3. This is not a transport-layer protocol; it is an application-layer protocol used by email clients to retrieve messages from a server. It runs over TCP, but it is not the transport protocol that SMTP itself uses.
Option c: UDP. UDP is a connectionless, best-effort transport protocol and does not guarantee delivery, ordering, or integrity of data. These guarantees are essential for email transmission, so SMTP does not use UDP.
Option d: DHCP. DHCP is a network management protocol that operates over UDP, used for dynamic IP address configuration. It is not a transport protocol and has no role in SMTP transmission.

SMTP protocol is used to send an email from source to destination. Which of the Transport layer protocol support SMTP?

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