INTRODUCTION
PROTOCOL LAYERING
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which network layer does the SMTP protocol operate at?
|
|
Transport Layer
|
|
|
Data Link Layer
|
|
|
Application Layer
|
|
|
Network Layer
|
Explanation:
Detailed explanation-1: -SMTP is an application layer protocol that is used to transmit electronic mail. The SMTP sender process uses a randomly assigned TCP port above 1023 to send SMTP messages to the SMTP receiver process that is listening at the well-known TCP port 25.
Detailed explanation-2: -SMTP is an application layer protocol (layer 7).
Detailed explanation-3: -SMTP is used to send and receive email. It is sometimes paired with IMAP or POP3 (for example, by a user-level application), which handles the retrieval of messages, while SMTP primarily sends messages to a server for forwarding.
There is 1 question to complete.