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ISA ISA-IEC-62443 Exam Sample Questions

Question # 1

Which organization manages the ISASecure conformance certification program? Available Choices (select all choices that are correct)

A. American Society for Industrial Security

B. Automation Federation

C. National Institute of Standards and Technology

D. Security Compliance Institute

Answer

D. Security Compliance Institute

The ISASecure conformance certification program is managed by the Security Compliance Institute (ISCI), a non-profit organization established in 2007 by a group of industry stakeholders, including end users, suppliers, and integrators. ISCI’s mission is to provide a common industry-accepted set of device and process requirements that drive device security, simplifying procurement for asset owners and device assurance for equipment vendors12.

References:

1: ISASecure - IEC 62443 Conformance Certification - Official Site
2: Certifications - ISASecure

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Question # 2

Which policies and procedures publication is titled Patch Manaqement in the IACS Environment? Available Choices (select all choices that are correct)

A. ISA-TR62443-2-3

B. ISA-TR62443-1-4

C. ISA-62443-3-3

D. ISA-62443-4-2

Answer

A. ISA-TR62443-2-3

ISA-TR62443-2-3 is the technical report that describes the requirements for asset owners and industrial automation and control system (IACS) product suppliers that have established and are now maintaining an IACS patch management program. Patch management is the process of applying software updates to fix vulnerabilities, bugs, or performance issues in the IACS components. Patch management is an essential part of maintaining the security and reliability of the IACS environment. The technical report provides guidance on how to establish a patch management policy, how to assess the impact and risk of patches, how to test and deploy patches, and how to monitor and audit the patch management process. References: 1, 2, 3

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Question # 3

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

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

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

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

D. OPC Classic is an obsolete communication standard.

Answer

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

OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535. Comprehensive Explanation: OPC Classic is a software interface technology that uses the Distributed Component Object Model (DCOM) protocol to facilitate the transfer of data between different industrial control systems. DCOM is a Microsoft technology that allows applications to communicate across a network. However, DCOM is not designed with security in mind, and it poses several challenges for firewall configuration. One of the main challenges is that DCOM does not use fixed TCP port numbers, but rather negotiates new port numbers within the first open connection. This means that intermediary firewalls can only be used with wide-open rules, leaving a large range of ports open for potential attacks. This makes OPC Classic very “firewall unfriendly” and reduces the security and protection they provide. References:

• Tofino Security OPC Foundation White Paper
• Step 2 (for client or server): Configuring firewall settings - GE
• Secure firewall for OPC Classic - Design World

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Question # 4

What is the definition of "defense in depth" when referring to Available Choices (select all choices that are correct)

A. Using countermeasures that have intrinsic technical depth.

B. Aligning all resources to provide a broad technical gauntlet

C. Requiring a minimum distance requirement between security assets

D. Applying multiple countermeasures in a layered or stepwise manner

Answer

D. Applying multiple countermeasures in a layered or stepwise manner

Explanation:

Defense in depth is a concept of cybersecurity that involves applying multiple layers of protection to a system or network, so that if one layer fails, another layer can prevent or mitigate an attack. Defense in depth is based on the principle that no single security measure is perfect or sufficient, and that multiple countermeasures can provide redundancy and diversity of defense. Defense in depth can also increase the cost and complexity for an attacker, as they have to overcome more obstacles and exploit more vulnerabilities to achieve their goals. Defense in depth is one of the key concepts of the ISA/IEC 62443 series of standards, which provide guidance and best practices for securing industrial automation and control systems (IACS). The standards recommend applying defense in depth strategies at different levels of an IACS, such as the network, the system, the component, and the policy and procedure level. The standards also define different zones and conduits within an IACS, which are logical or physical groupings of assets that share common security requirements and risk levels. By applying defense in depth strategies to each zone and conduit, the security of the entire IACS can be improved.

References:

ISA/IEC 62443-1-1:2009, Security for industrial automation and control systems - Part 1-1: Terminology, concepts and models1
ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels2
ISA/IEC 62443-4-1:2018, Security for industrial automation and control systems - Part 4-1: Product security development life-cycle requirements3
ISA/IEC 62443-4-2:2019, Security for industrial automation and control systems - Part 4-2: Technical security requirements for IACS components4

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Question # 5

Which of the following is an activity that should trigger a review of the CSMS? Available Choices (select all choices that are correct)

A. Budgeting

B. New technical controls

C. Organizational restructuring

D. Security incident exposing previously unknown risk.

Answer

B. New technical controls
C. Organizational restructuring
D. Security incident exposing previously unknown risk.

According to the ISA/IEC 62443-2-1 standard, a review of the CSMS should be triggered by any changes that affect the cybersecurity risk of the industrial automation and control system (IACS), such as new technical controls, organizational restructuring, or security incidents1. Budgeting is not a trigger for CSMS review, unless it impacts the cybersecurity risk level or the CSMS itself2. References: 1: ISA/IEC 62443-2-1:2010, Section 4.3.3.3 2: A Practical Approach to Adopting the IEC 62443 Standards, ISAGCA Blog3

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