1. Which protocol is used to send emails?
Correct Answer: c) SMTP
Explanation: SMTP (Simple Mail Transfer Protocol) is the standard protocol used for sending emails between servers and from email clients to mail servers.
2. What is the default port for SMTP?
Correct Answer: a) 25
Explanation: Port 25 is the traditional default port for SMTP communication between mail servers. Port 587 is often used for mail submission from clients.
3. Which protocol allows users to download emails to their local device?
Correct Answer: c) POP3
Explanation: POP3 (Post Office Protocol version 3) is designed to download emails from the server to the local device, typically deleting them from the server afterward.
4. IMAP differs from POP3 because it:
Correct Answer: b) Keeps emails on the server and syncs across devices
Explanation: IMAP (Internet Message Access Protocol) maintains emails on the server and synchronizes changes across all devices, making it ideal for multi-device access.
5. What is MIME in email systems?
Correct Answer: b) A standard for attaching multimedia files
Explanation: MIME (Multipurpose Internet Mail Extensions) extends email format to support text in character sets other than ASCII, and attachments of audio, video, images, etc.
6. Which port does secure SMTP (SMTPS) use?
Correct Answer: b) 465
Explanation: Port 465 was originally registered for SMTPS (SMTP over SSL). While deprecated in favor of STARTTLS on port 587, many providers still support port 465.
7. What does the "From:" field in an email header indicate?
Correct Answer: a) The sender's email address
Explanation: The "From:" field specifies the email address of the message sender. Note that this can be spoofed without proper authentication mechanisms like SPF/DKIM.
8. Which protocol retrieves emails while keeping them on the server?
Correct Answer: b) IMAP
Explanation: IMAP allows users to view and manipulate messages as if they were stored locally, but the messages remain on the mail server unless explicitly deleted.
9. What is the role of a Mail Transfer Agent (MTA)?
Correct Answer: b) Routes emails between servers
Explanation: An MTA (like Sendmail, Postfix, or Exchange) is responsible for transferring email messages from one computer to another using SMTP.
10. Which email protocol uses port 993 for secure communication?
Correct Answer: b) IMAPS
Explanation: IMAPS (IMAP over SSL/TLS) uses port 993. POP3S uses port 995, and SMTPS traditionally uses port 465 (though STARTTLS on port 587 is more common now).