Denial of Service (DoS) attacks

The DoS attacks are one of the major threats to the Internet. What are the major defensive mechanisms that can be used to stop such attacks? Pick up one mechanism and comment on it.

Intrusion Detection

Shows several types of intrusion detection systems. Please pick up one and discuss its basic mechanisms, and its major advantages and disadvantages. Did you use one of the IDS products in your workplace? If so what are your experiences?

Management issues of computer security

Although I am not personally interested in the management issues of computer security and they should not be the focus for CS/CIS security courses, I believe the security problem essentially should no longer be a technical issue in the long run. Please discuss one of the following topics: physical security, human factors in security, security auditing, security management and risk assessment, and legal and ethical aspects of computer security. Did you have any real-world experience with any of these issues?

System security

The textbook discussed some security topics based on two popular operating systems: Linux and Windows. In your opinion, which one is a more secure system? Why?