ISA-IEC-62443 Exam Questions & Answers

Correct Answer: A

The ISA/IEC 62443 series of standards is organized into four main categories for documents, based on the topics and perspectives that they cover. These categories are: General, Policies and Procedures, System, and Component12. General: This category covers topics that are common to the entire series, such as terms, concepts, models, and overview of the standards1. For example, ISA/IEC 62443-1-1 defines the terminology, concepts, and models for industrial automation and control systems (IACS) security3. Policies and Procedures: This category focuses on methods and processes associated with IACS security, such as risk assessment, system design, security management, and security program development1. For example, ISA/IEC 62443- 21 specifies the elements of an IACS security management system, which defines the policies, procedures, and practices to manage the security of IACS4. System: This category is about requirements at the system level, such as security levels, security zones, security lifecycle, and technical security requirements1. For example, ISA/IEC 62443-3-3 specifies the system security requirements and security levels for zones and conduits in an IACS5. Component: This category provides detailed requirements for IACS products, such as embedded devices, network devices, software applications, and host devices1. For example, ISA/IEC 62443-4-2 specifies the technical security requirements for IACS components, such as identification and authentication, access control, data integrity, and auditability. The other options are not valid categories for documents in the ISA/IEC 62443 series of standards, as they either do not reflect the structure and scope of the standards, or they mix different aspects of IACS security that are covered by different categories. For example, end-user, integrator, vendor, and regulator are not categories for documents, but rather roles or stakeholders that are involved in IACS security. Assessment, mitigation, documentation, and maintenance are not categories for documents, but rather activities or phases that are part of the IACS security lifecycle. People, processes, technology, and training are not categories for documents, but rather elements or dimensions that are essential for IACS security. References: ISA/IEC 62443 Series of Standards - ISA1 IEC 62443 - Wikipedia2 ISA/IEC 62443-1-1: Concepts and models3 ISA/IEC 62443-2-1: Security management system4 ISA/IEC 62443-3-3: System security requirements and security levels5 ISA/IEC 62443-4-2: Technical security requirements for IACS components

Correct Answer: A

IT systems and IACS have different security priorities, requirements, and challenges. According to the ISA/IEC 62443 standards, the security priority for IT systems is confidentiality, which means protecting the data from unauthorized access or disclosure. The security priority for IACS is integrity, which means ensuring the accuracy and consistency of the data and the functionality of the system. A loss of integrity in an IACS can have severe consequences, such as physical damage, environmental harm, or human injury. Therefore, IACS cybersecurity must address safety issues, which are not typically considered in IT security. Safety is the ability of the system to prevent or mitigate hazardous events that can cause harm to people, property, or the environment. The ISA/IEC 62443 standards provide guidance and best practices for ensuring the safety and security of IACS, as well as the availability and reliability of the system. Availability is the ability of the system to perform its intended function when required, and reliability is the ability of the system to perform its intended function without failure. These properties are also important for IT systems, but they may have different trade-offs and implications for IACS. For example, an IACS may have stricter performance and availability requirements than an IT system, as a delay or disruption in the IACS operation can affect the industrial process and its outcomes. Additionally, an IACS may have longer equipment lifetimes and less frequent maintenance windows than an IT system, which can make patching and updating more difficult and risky. Furthermore, an IACS may use different technologies and architectures than an IT system, such as legacy devices, proprietary protocols, or specialized hardware. These factors can create compatibility and interoperability issues, as well as increase the attack surface andcomplexity of the IACS. Therefore, IT security solutions and practices may not be sufficient or suitable for IACS, and they may need to be adapted or supplemented by IACS-specific security measures. The ISA/IEC 62443 standards address these differences and provide a comprehensive framework for securing IACS throughout their lifecycle. References: 1: Security of Industrial Automation and Control Systems - ISAGCA 2: ISA/IEC 62443 Series of Standards - ISA 3: ISA/IEC 62443 Series of Standards | ISAGCA 4: Securing IACS based on ISA/IEC 62443 ?Part 1: The Big Picture

Correct Answer: A

The ISASecure Integrated Threat Analysis (ITA) Program is a certification scheme that certifies off-the-shelf automation and control systems to the ISA/IEC 62443 series of standards1. The ITA Program consists of three main components2:

Software Development Security Assurance (SDSA): This component evaluates the security lifecycle and practices of the product supplier, such as security requirements, design, implementation, verification, and maintenance. The SDSA

certification is based on the ISA/IEC 62443-4-1 standard. Functional Security Assessment (FSA): This component verifies the security functions and features implemented in the product, such as identification and authentication, access

control, encryption, audit logging, and security management. The FSA certification is based on the ISA/IEC 62443-4-2 standard. Communications Robustness Testing (CRT): This component tests the resilience of the product against network

attacks, such as denial-of-service, fuzzing, spoofing, and replay. The CRT certification is based on the ISA/IEC 62443-4-2 and ISA/IEC 62443-3-3 standards .

References:

1: ISASecure - IEC 62443 Conformance Certification - Official Site

2: ISASecure - IEC 62443 Conformance Certification - Official Site [3]: ISA/IEC 62443-4-1: Secure Product Development Lifecycle Requirements, ISA, 2018.

[4]: ISA/IEC 62443-4-2: Technical Security Requirements for IACS Components, ISA, 2019.

[5]: ISA/IEC 62443-4-2: Technical Security Requirements for IACS Components, ISA, 2019.

[6]: ISA/IEC 62443-3-3: System Security Requirements and Security Levels, ISA, 2013.