CyberCertPrepOT Security FundamentalsOT Fundamentals: Securing Industrial Control SystemsEASYFree question
To reduce the risk of unauthorized devices being plugged into HMIs and panel PCs on the plant floor, which physical hardening measure is most directly relevant?
- A.Increase the HMI's display brightness to deter shoulder-surfing which likewise blocks unauthorized USB insertions at the same time
- B.Label every port with its IP address for faster troubleshooting, which executes every HMI graphic object inside its own isolated sandbox
- C.Disable or physically block unused USB and network ports and lock enclosure doors so cabling and ports are not casually accessible
- D.Replace copper Ethernet with longer patch cables for flexibility, since OT vendors ship fixes for disclosed flaws within the same week as IT vendors
Why C is correct
Physical port security disables, fills, or locks unused USB and network ports and restricts physical access to enclosures. This prevents an insider or visitor from quietly attaching a rogue device, which logical controls alone cannot stop once someone has hands-on access.
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