Consider the different activities related to email. m1: Send an email from…

2011

Consider the different activities related to email.

  • m1: Send an email from mail client to 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. A.

    m1: HTTP    m2:SMTP    m3:POP

  2. B.

    m1: SMTP    m2:FTPm3:HTTP

  3. C.

    m1: SMTP    m2:POPm3:HTTP

  4. D.

    m1: POP    m2:SMTPm3:IMAP

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Correct answer: C

Answer: m1 uses SMTP; m2 uses POP (or IMAP); m3 uses HTTP/HTTPS.

  • m1 (Send an email from mail client to mail server): SMTP is used to submit outgoing mail from a client to the mail server.

  • m2 (Download an email from mailbox server to a mail client): POP (Post Office Protocol) is commonly used to download messages to a client. IMAP is an alternative that keeps messages synchronized on the server.

  • m3 (Checking email in a web browser): Webmail uses HTTP or HTTPS to present and interact with mail through a browser.

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