MCQs

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1. When a mail server sends mail to other mail servers it becomes ______.
   a. SMTP server
   b. SMTP client
   c. Peer
   d. Master
   Answer: b. SMTP client
   (Source: sanfoundry.com)sanfoundry
2. The expansion of SMTP is ______.
   a. Simple Mail Transfer Protocol
   b. Simple Message Transfer Protocol
   c. Simple Mail Transmission Protocol
   d. Simple Message Transmission Protocol
   Answer: a. Simple Mail Transfer Protocol
   (Source: sanfoundry.com)sanfoundry
3. SMTP uses which of the following TCP ports by default?
   a. 22
   b. 23
   c. 21
   d. 25
   Answer: d. 25
   (Source: sanfoundry.com)sanfoundry
4. Which command in SMTP is used to specify the receiver’s email address?
   a. SEND TO
   b. RCPT TO
   c. MAIL TO
   d. RCVR TO
   Answer: b. RCPT TO
   (Source: sanfoundry.com)sanfoundry
5. What transport layer protocol does SMTP use?
   a. TCP
   b. UDP
   c. SCTP
   d. DCCP
   Answer: a. TCP
   (Source: sanfoundry.com)sanfoundry
6. SMTP is classified as which type of protocol?
   a. Pull protocol
   b. Push protocol
   c. Broadcast protocol
   d. Connectionless protocol
   Answer: b. Push protocol
   (Source: sanfoundry.com)sanfoundry
7. Which port is recommended for secure SMTP submission using TLS?
   a. 465
   b. 587
   c. 25
   d. 2525
   Answer: b. 587
   (Source: geeksforgeeks.org)geeksforgeeks
8. What is the purpose of the EHLO command in SMTP?
   a. To end the connection
   b. To specify the recipient
   c. To identify the client to the server using Extended SMTP
   d. To send the message body
   Answer: c. To identify the client to the server using Extended SMTP
   (Source: geeksforgeeks.org)geeksforgeeks
9. What kind of data encoding is required when sending multimedia over SMTP?
   a. Binary
   b. ASCII
   c. Hexadecimal
   d. Unicode
   Answer: b. ASCII
   (Source: sanfoundry.com)sanfoundry
10. Which SMTP server allows any user on the internet to send mail through it?
    a. Secured SMTP server
    b. Open mail relay
    c. Mail fence server
    d. Restricted mail server
    Answer: b. Open mail relay
    (Source: sanfoundry.com)sanfoundry
11. What limitation does SMTP have regarding message size and content?
    a. SMTP compresses messages automatically
    b. SMTP restricts to ASCII text only
    c. SMTP can send multimedia files directly
    d. SMTP encrypts message body natively
    Answer: b. SMTP restricts to ASCII text only
    (Source: geeksforgeeks.org)geeksforgeeks
12. What command terminates the SMTP session?
    a. QUIT
    b. STOP
    c. END
    d. CLOSE
    Answer: a. QUIT
    (Source: sanfoundry.com)sanfoundry
13. What happens if multiple recipients are specified in SMTP?
    a. Group the addresses in one RCPT TO command
    b. The RCPT TO command is repeated for each recipient
    c. Only the first recipient receives the message
    d. SMTP rejects multiple recipients
    Answer: b. The RCPT TO command is repeated for each recipient
    (Source: sanfoundry.com)sanfoundry
14. Which SMTP command is used to specify the sender’s email address?
    a. HELO
    b. MAIL FROM
    c. RCPT TO
    d. DATA
    Answer: b. MAIL FROM
    (Source: sanfoundry.com)sanfoundry
15. SMTP transmits email in which layer of the OSI model?
    a. Transport layer
    b. Network layer
    c. Application layer
    d. Data link layer
    Answer: c. Application layer
    (Source: sanfoundry.com)sanfoundry
16. Which of the following is not an SMTP command?
    a. DATA
    b. HELO
    c. QUIT
    d. RECEIVE
    Answer: d. RECEIVE
    (Source: sanfoundry.com)sanfoundry
17. What does SMTP stand for?
    a. Simple Mail Transfer Protocol
    b. Simple Message Transfer Program
    c. Server Mail Transfer Protocol
    d. Secure Mail Transfer Protocol
    Answer: a. Simple Mail Transfer Protocol
    (Source: trustedinstitute.com)trustedinstitute
18. SMTP messages are stored temporarily on servers while being forwarded. What is this model called?
    a. Client-server model
    b. Store-and-forward model
    c. Peer-to-peer model
    d. Push-and-pull model
    Answer: b. Store-and-forward model
    (Source: trustedinstitute.com)trustedinstitute
19. What is the default port for SMTP relay between mail servers?
    a. 21
    b. 25
    c. 53
    d. 110
    Answer: b. 25
    (Source: geeksforgeeks.org)geeksforgeeks
20. What SMTP feature allows for authentication of the message sender in Extended SMTP?
    a. HELO command
    b. EHLO command
    c. AUTH command
    d. MAIL FROM command
    Answer: c. AUTH command
    (Source: geeksforgeeks.org)geeksforgeeks
21. Which port is considered deprecated for secure SMTP but was once widely used?
    a. 465
    b. 587
    c. 25
    d. 2525
    Answer: a. 465
    (Source: geeksforgeeks.org)geeksforgeeks
22. SMTP strictly requires messages to be composed in what format?
    a. 8-bit ASCII
    b. 7-bit ASCII
    c. Binary
    d. UTF-8
    Answer: b. 7-bit ASCII
    (Source: sanfoundry.com)sanfoundry
23. SMTP communication sessions are initiated by which entity?
    a. SMTP server
    b. SMTP client
    c. Relay server
    d. Mailbox server
    Answer: b. SMTP client
    (Source: sanfoundry.com)sanfoundry
24. Which of these is NOT a role of SMTP?
    a. Sending mail from sender to receiver
    b. Receiving mail from clients
    c. Relaying mail between mail servers
    d. Storing mail for receiving client access
    Answer: d. Storing mail for receiving client access
    (Source: geeksforgeeks.org)geeksforgeeks
25. What is the primary reason ISPs block outbound SMTP traffic from port 25?
    a. To increase security against spam and abuse
    b. To improve network speed
    c. To reduce TCP congestion
    d. To prevent client authentication issues
    Answer: a. To increase security against spam and abuse
    (Source: geeksforgeeks.org)geeksforgeeks
26. Which SMTP command is used to send the actual message content?
    a. MAIL FROM
    b. DATA
    c. SEND
    d. PUSH
    Answer: b. DATA
    (Source: sanfoundry.com)sanfoundry
27. What does the STARTTLS command do in SMTP?
    a. Closes the connection
    b. Upgrades a plain text connection to a secure one using TLS
    c. Sends the email data
    d. Authenticates the user
    Answer: b. Upgrades a plain text connection to a secure one using TLS
    (Source: sanfoundry.com)sanfoundry
28. SMTP traditionally does not support which of the following natively?
    a. Sending plain text
    b. Authentication
    c. Multimedia attachments
    d. TCP connection
    Answer: c. Multimedia attachments
    (Source: geeksforgeeks.org)geeksforgeeks
29. What extension to SMTP allows for enhanced features, including authentication and multimedia support?
    a. SMTP+
    b. Extended SMTP (ESMTP)
    c. Secure SMTP (SSMTP)
    d. Simple Mail Transfer Protocol version 2
    Answer: b. Extended SMTP (ESMTP)
    (Source: geeksforgeeks.org)geeksforgeeks
30. Which of the following port numbers is not an official SMTP port but sometimes used as an alternative?
    a. 21
    b. 2525
    c. 110
    d. 143
    Answer: b. 2525
    (Source: geeksforgeeks.org)geeksforgeeks
31. Which RFC defines the SMTP protocol?
    a. RFC 793
    b. RFC 821
    c. RFC 1035
    d. RFC 5321
    Answer: d. RFC 5321
    (Source: general SMTP knowledge from IETF)
32. During an SMTP session, which command is used by the client to introduce itself to the server?
    a. HELO
    b. RCPT TO
    c. MAIL FROM
    d. EHLO
    Answer: a. HELO
    (Source: sanfoundry.com)sanfoundry
33. In Extended SMTP, which command replaces HELO?
    a. MAIL
    b. RCPT
    c. EHLO
    d. AUTH
    Answer: c. EHLO
    (Source: geeksforgeeks.org)geeksforgeeks
34. What does the 250 reply code in SMTP signify?
    a. Command okay
    b. Syntax error
    c. Service not available
    d. Mailbox unavailable
    Answer: a. Command okay
    (Source: general SMTP protocol knowledge)
35. What is the maximum message size limit defined by default in SMTP?
    a. 64KB
    b. No fixed limit defined in SMTP standard
    c. 10MB
    d. 100KB
    Answer: b. No fixed limit defined in SMTP standard
    (Source: internet standards)
36. Which protocol is typically used to receive mail from a server?
    a. SMTP
    b. FTP
    c. POP3
    d. HTTP
    Answer: c. POP3
    (Source: sanfoundry.com)sanfoundry
37. Which SMTP command tells the server that the mail data transmission is complete?
    a. END
    b. QUIT
    c. . (single period on a line)
    d. CLOSE
    Answer: c. . (single period on a line)
    (Source: general SMTP working knowledge)
38. Which SMTP reply code indicates that the mailbox is unavailable?
    a. 250
    b. 421
    c. 550
    d. 220
    Answer: c. 550
    (Source: general SMTP knowledge)
39. Which of these is a common security concern with SMTP servers?
    a. Slow data transfer
    b. Open mail relay abuse
    c. DNS lookup failure
    d. Incorrect MIME headers
    Answer: b. Open mail relay abuse
    (Source: sanfoundry.com)sanfoundry
40. What is the function of a Mail Transfer Agent (MTA) in SMTP?
    a. To compose emails
    b. To transfer email messages using SMTP
    c. To encrypt email content
    d. To receive user input
    Answer: b. To transfer email messages using SMTP
    (Source: geeksforgeeks.org)geeksforgeeks
41. What is the default timeout for SMTP servers to wait for commands?
    a. 30 seconds
    b. 60 seconds
    c. Varies by implementation, no default standard
    d. 5 minutes
    Answer: c. Varies by implementation, no default standard
    (Source: general protocol knowledge)
42. Which of these SMTP servers handles receiving mail from clients?
    a. Outgoing mail server
    b. Incoming mail server
    c. SMTP relay server
    d. Mail delivery agent
    Answer: b. Incoming mail server
    (Source: testbook.com)testbook
43. What command does the SMTP client use to request authentication?
    a. AUTH
    b. LOGIN
    c. PASS
    d. USER
    Answer: a. AUTH
    (Source: geeksforgeeks.org)geeksforgeeks
44. Which SMTP extension allows for sending 8-bit messages, increasing email capabilities?
    a. 8BITMIME
    b. EHLO
    c. STARTTLS
    d. AUTH
    Answer: a. 8BITMIME
    (Source: general Extended SMTP standards)
45. In SMTP, what is a “relay”?
    a. A client sending mail
    b. A server forwarding mail to another server
    c. A command to start communication
    d. The user reading the mail
    Answer: b. A server forwarding mail to another server
    (Source: geeksforgeeks.org)geeksforgeeks
46. What is the key difference between SMTP and POP3?
    a. SMTP is used to send email; POP3 is used to receive email
    b. SMTP transfers files; POP3 manages addresses
    c. SMTP is for file sharing; POP3 is for web browsing
    d. SMTP authenticates users; POP3 sends messages
    Answer: a. SMTP is used to send email; POP3 is used to receive email
    (Source: sanfoundry.com)sanfoundry
47. Which SMTP command is used to specify that the mail message data will begin?
    a. MAIL FROM
    b. RCPT TO
    c. DATA
    d. SEND
    Answer: c. DATA
    (Source: sanfoundry.com)sanfoundry
48. What is the primary protocol SMTP uses for secure transmission of emails?
    a. TLS
    b. FTP
    c. SSH
    d. HTTP
    Answer: a. TLS
    (Source: geeksforgeeks.org)geeksforgeeks
49. Which SMTP response code means “Service ready”?
    a. 220
    b. 250
    c. 354
    d. 421
    Answer: a. 220
    (Source: general SMTP reply codes)
50. What does the “MAIL FROM” command specify in SMTP?
    a. Recipient address
    b. Sender address
    c. Subject of the email
    d. Message body
    Answer: b. Sender address
    (Source: sanfoundry.com)sanfoundry

1. https://www.sanfoundry.com/computer-networks-mcqs-smtp/
2. https://www.sanfoundry.com/computer-networks-questions-answers-smtp/
3. https://www.geeksforgeeks.org/computer-networks/simple-mail-transfer-protocol-smtp/
4. https://trustedinstitute.com/concept/comptia-a-plus/network-protocols/simple-mail-transfer-protocol/
5. https://testbook.com/objective-questions/mcq-on-smtp–5eea6a0939140f30f369d902
6. https://testbook.com/question-answer/smtp-stands-for-________–6070c25328f6257abd389537
7. https://examradar.com/remote-logging-electronic-mail-file-transfer-mcq-data-communication-networking/
8. https://edurev.in/test/7070/Test-SMTP-Application-Layer
9. https://interview4all.com/latest-smtp-interview-questions/
10. https://wayground.com/admin/quiz/658051be164c30052856a86e/mail-servers-protocols-quiz
11. https://www.scribd.com/document/514290617/Email-MCQ-by-himexam
12. https://www.scribd.com/document/541997649/SMTP
13. https://mockrounds.com/tech_trivias/email-protocols-essentials-smtp-pop3-and-imap-quiz/
14. https://www.youtube.com/watch?v=weokNAhlHUM
15. https://study.com/academy/practice/quiz-worksheet-smtp.html
16. https://wayground.com/admin/quiz/654d177d947e71cce417e857/smtp-pop3-imap-knowledge
17. https://www.examveda.com/what-does-the-smtp-in-an-smtp-server-stand-for-2166/
18. https://www.interviewbit.com/networking-interview-questions/
19. https://cybotech.in/start-quiz/100-mcqs-network-protocols-computer-fundamentals-basics-quiz-online-test
20. https://www.remoterocketship.com/advice/10-smtp-interview-questions-and-answers-in-2023