ISA99 ICSSCADA Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A food and beverage company is implementing ISA99 guidance to secure its bottling plant. They have a mix of modern and legacy equipment. The security team wants to apply a consistent set of controls across the entire plant. What is the most practical implementation approach according to ISA99?

   • AApply the same security level to all zones to ensure uniformity.
   • BGroup assets into zones based on function and risk, then apply appropriate security levels and controls to each zone.
   • CReplace all legacy equipment with modern devices that support the same security features.
   • DImplement a single firewall at the plant's internet connection and rely on it for all security.
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2. 42foundation · easy

   What is the primary focus of the implementation guidance provided by ISA99?

   • AOffering practical recommendations for applying security measures throughout the IACS lifecycle
   • BSpecifying the exact security products that must be used in every industrial environment
   • CDefining mandatory security certifications for all industrial control system operators
   • DProviding step-by-step instructions for configuring specific firewall brands
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4. 43expert · medium

   A gas pipeline company is implementing ISA99 zones and conduits. They have a 'Control Center Zone' and multiple 'Station Zones' connected via a wide area network (WAN). The security team wants to ensure that a compromise in one station does not affect the control center. What is the most effective way to achieve this?

   • AUse a single firewall at the control center to protect all stations.
   • BConnect all stations directly to each other to improve redundancy.
   • CUse a VPN for all communication but do not segment the stations.
   • DPlace a firewall at each station's connection to the WAN and configure rules to restrict traffic to only the control center.
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5. 44application · medium

   A plant manager is explaining to the board why they need to invest in cybersecurity. They mention that ISA99 provides a framework for securing industrial automation and control systems. Which statement best describes the scope of ISA99?

   • AISA99 is a single standard that provides a one-size-fits-all solution for all industries.
   • BISA99 covers all aspects of industrial automation and control systems, including safety, reliability, and cybersecurity.
   • CISA99 applies only to new systems being designed, not to existing operational systems.
   • DISA99 provides a framework for addressing cybersecurity across the entire lifecycle of industrial automation and control systems.
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6. 45expert · medium

   A refinery is upgrading its distributed control system (DCS). The risk assessment identifies that a cyber incident could cause a fire or explosion, leading to loss of life. The team is debating between achieving SL 3 and SL 4. They have budget constraints and the current system is SL 2. What is the most appropriate decision according to ISA99?

   • AAim for SL 3 because it is the highest level that can be achieved with the current budget.
   • BConduct a detailed risk assessment to determine the required SL, then implement countermeasures to achieve that SL, and formally accept any residual risk.
   • CKeep the system at SL 2 because the current system has never been attacked.
   • DAim for SL 4 because the consequence is loss of life, regardless of cost.
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