Practice Quiz

CompTIA Network+

Category - Security

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Bruce is a new network consultant and is designing a new network for a small business. Bruce sees that the business will have a mail server behind a firewall. What port needs to be open on the firewall for the server to send and receive email outside the local network?
  1. Port 25
  2. Port 110
  3. None, mail servers do not use ports
  4. Port 3389
Explanation
Answer: A - Mail servers communicate using SMTP, which in turn uses port 25.
Key Takeaway: SMTP is the protocol used by mail servers to send and receive mail. SMTP stands for Simple Mail Transport Protocol and uses port 25 by default. Port 110 is used by POP3 servers for clients to retrieve mail, and port 3389 is for Microsoft remote desktop protocol.
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