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      Question

      Key function of a firewall

      is
      A Moving Correct Answer Incorrect Answer
      B Monitoring Correct Answer Incorrect Answer
      C Deleting Correct Answer Incorrect Answer
      D Copying Correct Answer Incorrect Answer

      Solution

      Firewalls are systems which protect networks or network devices, such as industrial PCs, control systems, cameras, etc., from unauthorized access by preventing network traffic to or from these systems. The fundamental technical function of any firewall is to filter packets.

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