Câu 67: 312-50: CEH Certified Ethical Hacker (312-50v9)

While examining audit logs, you discover that people are able to telnet into the SMTP server on port 25. You would like to block this, though you do not see any evidence of an attack or other wrong doing. However, you are concerned about affecting the normal functionality of the email server. From the following options choose how best you can achieve this objective?

1. A. Block port 25 at the firewall.
2. B. Shut off the SMTP service on the server.
3. C. Force all connections to use a username and password.
4. D. Switch from Windows Exchange to UNIX Sendmail.
5. E. None of the above. — đáp án hiện tại