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Multiple choice › Web protocols

Web protocols

1. Web protocols

Which protocol and port combination is used for secure web browsing?

  1. SMTP on port 25
  2. FTP on port 21
  3. HTTP on port 80
  4. HTTPS on port 443
Answer

D

HTTPS = HTTP over TLS, default port 443. HTTP is 80, FTP 21 (control), SMTP 25.

2. Web protocols

Which protocol is used to send an email from a mail client to a mail server?

  1. IMAP
  2. POP3
  3. SMTP
  4. DNS
Answer

C

SMTP sends/transfers email. POP3 and IMAP retrieve it. (2025 sample exam Q2 asked what SMTP is.)

3. Web protocols

How do IMAP and POP3 differ?

  1. IMAP is for file transfer; POP3 is for web pages
  2. POP3 sends email; IMAP only receives it
  3. IMAP keeps messages on the server and synchronises across devices; POP3 typically downloads them to one device
  4. They are identical except for the port
Answer

C

IMAP = mailbox stays on the server (multi-device). POP3 = download, often removing from the server.

4. Web protocols

Which statement about SFTP is correct?

  1. It sends files in plain text
  2. It transfers files securely, running over SSH, usually on port 22
  3. It is the same as HTTP and uses port 80
  4. It is used to retrieve email
Answer

B

SFTP is secure file transfer over SSH (port 22 by default; general networking fact). It is not FTP-over-HTTPS and is not plain text. Note the school notes wrongly say 443.

5. Web protocols

Which protocol breaks data into packets, checks that all arrive and reassembles them in the correct order?

  1. TCP
  2. FTP
  3. DNS
  4. SMTP
Answer

A

TCP is connection oriented: it handles error checking, retransmission and reordering. IP handles addressing and routing.