ISRO-DEC2017-35

Question

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

• A. SMTP,HTTPS,IMAP
   
• B. SMTP,POP,IMAP
   
• C. SMTP,IMAP,HTTPS
   
• D. SMTP,IMAP,POP

Answer 1

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.

Answer 2

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

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