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1. Which port is used by Simple Mail Transfer Protocol?
- A. 21
- B. 21
- C. 21
- D. 21
Answer: Option B
Explanation:
Simple Mail Transfer Protocol (SMTP) uses several ports, with port 25 being the original and often unencrypted standard, port 587 being the recommended secure port for email submission, and port 465 being a legacy port for secure, implicit TLS connections
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