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Which of the following would be MOST appropriate to sec…

Which of the following would be MOST appropriate to secure an existing SCADA system by preventing
connections from unauthorized networks?

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A.
Implement a HIDS to protect the SCADA system

B.
Implement a Layer 2 switch to access the SCADA system

C.
Implement a firewall to protect the SCADA system

D.
Implement a NIDS to protect the SCADA system

Explanation:
Firewalls manage traffic using filters, which is just a rule or set of rules. A recommended guideline for firewall
rules is, “deny by default; allow by exception”. This means that if a network connection is not specifically
allowed, it will be denied.

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