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Consider different activities related to email.

m1: Send an email from a mail client to a mail server

m2: Download an email from mailbox server to a mail client

m3: Checking email in a web browser

Which is the application level protocol used in each activity?


1. m1 : HTTP m2 : SMTP m3 : POP
2. m1 : SMTP m2 : FTP m3 : HTTP 
3. m1 : SMTP  m2 : POP m3 : HTTP
4. m1 : POP m2 : SMTP m3 : IMAP

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Correct Answer - Option 3 : m1 : SMTP  m2 : POP m3 : HTTP

The correct answer is option 3

SMTP:

  • SMTP stands for Simple Mail Transfer Protocol and it is an application layer protocol.
  • SMTP is used to send an email from a mail client to a mail server.
  • SMTP uses port 25.

POP:

  • POP stands for Post Office Protocol and it is also an application layer protocol.
  • POP allows an email client to download an email from an email server.

HTTP:

The Hypertext Transfer Protocol (HTTP) is an Application Layer protocol and is used to check email in a web browser.

So, m1 : SMTP  m2 : POP m3 : HTTP

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