The protection of key information infrastructure is to implement key protection on the basis of network security level protection. Generally speaking, critical information infrastructure should be classified into three or four levels, or should be identified in a three or four-level system. Steps to determine the key information infrastructure: first, determine the key business of the department, the region and the industry; Secondly, determine the information system or industrial control system that supports key business; Finally, according to the above information, the key information infrastructure is finally determined.
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