ISA-IEC-62443 Exam Dumps - ISA/IEC 62443 Cybersecurity Fundamentals Specialist

Cybersecurity and physical security regulations are intended to provide guidance and requirements for protecting industrial control systems from various threats and risks. However, these regulations may face mixed resistance from different stakeholders for various reasons. One of the reasons is that there are a limited number of enforced cybersecurity and physical security regulations, especially at the international level. This means that some regions or countries may have more stringent or comprehensive regulations than others, creating inconsistencies and challenges for cross-border cooperation and compliance. Moreover, some regulations may be outdated or not aligned with the current best practices and standards, such as ISA/IEC 62443, which may limit their effectiveness and applicability. Therefore, some organizations may prefer to follow voluntary standards or frameworks, such as ISA/IEC 62443, rather than mandatory regulations, as they may offer more flexibility and adaptability to the specific needs and contexts of each industrial control system. References:

ISA/IEC 62443 Standards to Secure Your Industrial Control System, page 3

Using the ISA/IEC 62443 Standard to Secure Your Control System, page 9

Modbus TCP is a widely used protocol in industrial control systems, enabling communication between devices such as PLCs and SCADA systems over Ethernet networks. It is an adaptation of the classic Modbus protocol to TCP/IP networks and is explicitly referenced in ISA/IEC 62443 documentation as a common protocol for IACS communications. FTP, HTTP, and SMTP are general IT protocols and not primarily associated with industrial control communications.

Secure Sockets Layer (SSL) is no longer considered secure due to known vulnerabilities and cryptographic weaknesses. Modern standards require the use of newer versions of Transport Layer Security (TLS), and similarly, DES is deprecated for strong security. However, the best and most universally referenced example is SSL, as major industry and regulatory bodies recommend disabling SSL entirely in favor of TLS 1.2 or above.

ISA/IEC 62443-3-2 intentionally avoids mandating a single risk assessment methodology. Instead, it defines requirements for the outcome and consistency of the risk assessment process.

Step 1: Methodology flexibility

The standard allows asset owners to use qualitative, quantitative, or hybrid methods based on system complexity, organizational maturity, and available data.

Step 2: Consistency requirement

What ISA/IEC 62443 does require is that the methodology be documented, repeatable, and consistent, particularly in how risks are ranked and compared.

Step 3: Security Level determination

Consistent risk ranking is essential for determining Target Security Levels (SL-T) and for justifying security decisions during audits.

Step 4: Why other options are incorrect

Avoiding standards undermines rigor. Using only qualitative methods may be insufficient. Mixing methodologies can introduce inconsistency and invalidate comparisons.

Therefore, the approach that best aligns with ISA/IEC 62443 is to follow any documented methodology that uses a consistent risk ranking scale.

The SL-T (BPCS Zone) vector {2 2 0 1 3 1 3} represents the Target Security Level (SL-T) across each of the seven Foundational Requirements (FRs) in ISA/IEC 62443-3-3.

Each number in the vector corresponds to a security level (0–4) assigned to a particular FR, as follows:

FR1 – Identification & Authentication Control (IAC): 2

FR2 – Use Control (UC): 2

FR3 – System Integrity (SI): 0

FR4 – Data Confidentiality (DC): 1

FR5 – Restricted Data Flow (RDF): 3

FR6 – Timely Response to Events (TRE): 1

FR7 – Resource Availability (RA): 3

“Security levels are represented as vectors of seven values, each corresponding to the target security level for a foundational requirement (FR).”

— ISA/IEC 62443-3-3:2013, Annex A – SL Vector Format

This allows zone-specific tailoring based on risk — some FRs may require SL 3, others SL 0, depending on system criticality and exposure.

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

ISA/IEC 62443 is developed within the international standards system, where national participation is coordinated through National Standardization Bodies (NSBs). These organizations represent their country’s interests in international standards committees and manage the adoption of international standards at the national level.

Step 1: Role of a National Standardization Body

An NSB acts as the official representative of a country within international standards organizations such as IEC and ISO. It coordinates national input, votes on standards, and nominates experts to technical committees.

Step 2: Adoption of international standards

NSBs are responsible for adopting international standards as national standards, often with minimal or no modification. This enables consistent global alignment while supporting local implementation.

Step 3: Why other options are incorrect

Global SDOs develop standards internationally but do not represent individual countries.

Regulatory agencies enforce laws, not standards.

Industry consortia represent private-sector interests, not national positions.

Thus, the correct role is National Standardization Body.

The four documents classified under the General category of ISA/IEC 62443 are:

Part 1-1: Terminology, concepts, and models

Part 1-2: Master glossary of terms and definitions

Part 1-3: System security conformance metrics