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From the following options choose how best you can achieve this objective?
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?
A . Block port 25 at the firewall.
B . Shut off the SMTP service on the server.
C . Force all connections to use a username and password.
D . Switch from Windows Exchange to UNIX Sendmail.
E . None of the above.
Answer: E
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Answer C:
By enforcing authentication using a username and password for SMTP connections, you can ensure that only authorized users are able to access the SMTP server. This can be achieved by implementing SMTP authentication mechanisms such as SMTP-AUTH or STARTTLS, which require clients to provide valid credentials before establishing a connection to the server.