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ISRO-DEC2017-35

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Consider the set of activities related to e-mail
 

A: Send an e-mail from a mail client to mail server.
B: Download e-mail headers from mailbox and retrieve mails from server to cache
C: Checking e-mail through a web browser 

The application level protocol used for each activity in the same sequence is

  1. SMTP,HTTPS,IMAP
     
  2. SMTP,POP,IMAP
     
  3. SMTP,IMAP,HTTPS
     
  4. SMTP,IMAP,POP
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A: Send an e-mail from a mail client to mail server. need SMTP/SMTPS
B: Download e-mail headers from mailbox and retrieve mails from server to cache need IMAP or POP3 (or their secure versions)
C: Checking e-mail through a web browser need HTTP/HTTPS

C is answer.

For the secured versions of the protocols the identity of the user is verified using Private/Public keys and this requires SSL certificates.

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option C is correct. SMTP is basically a push protocol so A is smtp.

In browser one of the main protocols is http/https .
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