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Maria works as a Network Security Officer for Gentech Inc. She wants to encrypt her network traffic. The specific requirement for the encryption algorithm is that it must be a symmetric key block cipher.

Which of the following techniques will she use to fulfill this requirement?

John works as a Network Administrator for We-are-secure Inc. The We-are-secure server is based on Windows Server 2003. One day, while analyzing the network security, he receives an error message that Kernel32.exe is encountering a problem. Which of the following steps should John take as a countermeasure to this situation?

Each correct answer represents a complete solution. Choose all that apply.

Which of the following programs can be used to detect stealth port scans performed by a malicious hacker?

Each correct answer represents a complete solution. Choose all that apply.

Which of the following types of attacks cannot be prevented by a firewall?

Each correct answer represents a complete solution. Choose all that apply.