CPT Computer Systems & Software Updates 2

Question 1

Which type of software update specifically addresses known security vulnerabilities without adding new features?

Accepted Answer

Security patch

Answer

Security patches are targeted fixes released to close known vulnerabilities without changing functionality.

Question 2

In a process plant DCS, what is the recommended practice before applying a software update to a live controller?

Accepted Answer

Test the update on an offline or redundant system first

Answer

Testing on an offline or redundant system first ensures the update does not disrupt live process control.

Question 3

What does the term 'rollback' mean in the context of software updates for process control systems?

Accepted Answer

Reverting to a previously stable software version after a failed update

Answer

Rollback is the process of restoring the previous software version when a new update causes problems.

Question 4

Which communication protocol is commonly used by SCADA systems to poll field devices for data?

Accepted Answer

Modbus

Answer

Modbus is a widely used serial/Ethernet protocol for SCADA systems to communicate with PLCs and field instruments.

Question 5

What is the purpose of a 'change freeze' period in process plant IT management?

Accepted Answer

To prohibit non-emergency software changes during critical production periods

Answer

A change freeze prevents software modifications during high-risk periods such as peak production or regulatory audits.

(CPT) Certified Process Technician Practice Test