Free Access ISA.ISA-IEC-62443.v2023-09-26.q37 Practice Test (Page 6)

Question 21

Which is the PRIMARY objective when defining a security zone?
Available Choices (select all choices that are correct)

A.All assets in the zone must be from the same vendor.

B.All assets in the zone must be at the same level in the Purdue model.

C.All assets in the zone must share the same security requirements.

D.All assets in the zone must be physically located in the same area.

Question 22

Which is an important difference between IT systems and IACS?
Available Choices (select all choices that are correct)

A.IACS cybersecurity must address safety issues.

B.Routers are not used in IACS networks.

C.The IT security priority is availability.

D.The IACS security priority is integrity.

Question 23

Which of the following is a cause for the increase in attacks on IACS?
Available Choices (select all choices that are correct)

A.The move away from commercial off the shelf (COTS) systems, protocols, and networks

B.Fewer personnel with system knowledge having access to IACS

C.Use of proprietary communications protocols

D.Knowledge of exploits and tools readily available on the Internet

Question 24

Which is a PRIMARY reason why network security is important in IACS environments?
Available Choices (select all choices that are correct)

A.PLCs are programmed using ladder logic.

B.PLCs use serial or Ethernet communications methods.

C.PLCs under cyber attack can have costly and dangerous impacts.

D.PLCs are inherently unreliable.

Question 25

Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)

A.OPC Classic is an obsolete communication standard.

B.OPC Classic is allowed to use only port 80.

C.OPC Classic works with control devices from different manufacturers.

D.OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535.

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