Chapter 15

1: Why should you not assume that all “quiet” users are well-behaved citizens of your environment?
A1: One of the goals of hackers is for their actions to go unnoticed. A quiet user could potentially be a hacker who is working his or her way into your system.
2: What kind of malicious activity would a sudden increase in disk usage indicate?
A2: A sudden increase in disk usage might indicate the presence of warez, or pirated software.
3: Would you use the wall command or email to announce a system shutdown that is taking place in 5 minutes?
A3: You should use the wall command to announce a system shutdown that is taking place in 5 minutes. wall broadcasts a message to the terminals of users logged into a system, forcing users to read your ...

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