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ISA ISA-IEC-62443 Exam Sample Questions

Question # 1

How many element qroups are in the "Addressinq Risk" CSMS cateqorv? Available Choices (select all choices that are correct)

A. 2

B. 3

C. 4

D. 5

Answer

B. 3

The “Addressing Risk” CSMS category consists of three element groups: Security Policy, Organization and Awareness; Selected Security Countermeasures; and Implementation of Security Program1. These element groups cover the aspects of defining the security objectives, roles and responsibilities, policies and procedures, awareness and training, security countermeasures selection and implementation, and security program execution and maintenance1. The “Addressing Risk” CSMS category aims to reduce the security risk to an acceptable level by applying appropriate security measures to the system under consideration (SuC)1. References: 1: ISA/IEC 62443-2-1: Security for industrial automation and control systems: Establishing an industrial automation and control systems security program

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Question # 2

Which of the following is a cause for the increase in attacks on IACS? Available Choices (select all choices that are correct)

A. Use of proprietary communications protocols

B. The move away from commercial off the shelf (COTS) systems, protocols, and networks

C. Knowledge of exploits and tools readily available on the Internet

D. Fewer personnel with system knowledge having access to IACS

Answer

A. Use of proprietary communications protocols
C. Knowledge of exploits and tools readily available on the Internet

One of the reasons for the increase in attacks on IACS is the availability of information and tools that can be used to exploit vulnerabilities in these systems. The Internet provides a platform for hackers, researchers, and activists to share their knowledge and techniques for compromising IACS. Some examples of such information and tools are:

• Stuxnet: A sophisticated malware that targeted the Iranian nuclear program in 2010. It exploited four zero-day vulnerabilities in Windows and Siemens software to infect and manipulate the programmable logic controllers (PLCs) that controlled the centrifuges. Stuxnet was widely analyzed and reported by the media and security experts, and its source code was leaked online1.
• Metasploit: A popular penetration testing framework that contains modules for exploiting various IACS components and protocols. For instance, Metasploit includes modules for attacking Modbus, DNP3, OPC, and Siemens S7 devices2.
• Shodan: A search engine that allows users to find devices connected to the Internet, such as webcams, routers, printers, and IACS components. Shodan can reveal the location, model, firmware, and configuration of these devices, which can be used by attackers to identify potential targets and vulnerabilities3.
• ICS-CERT: A website that provides alerts, advisories, and reports on IACS security issues and incidents. ICS-CERT also publishes vulnerability notes and mitigation recommendations for various IACS products and vendors4. These sources of information and tools can be useful for legitimate purposes, such as security testing, research, and education, but they can also be misused by malicious actors who want to disrupt, damage, or steal from IACS. Therefore, IACS owners and operators should be aware of the threats and risks posed by the Internet and implement appropriate security measures to protect their systems.

References:

• The increase in attacks on Industrial Automation and Control Systems (IACS) can be attributed to several factors, including: A.Use of proprietary communications protocols:These can pose security risks because they may not have been designed with security in mind and are often not as well-tested against security threats as more standard protocols. C.Knowledge of exploits and tools readily available on the Internet:The availability of information about vulnerabilities and exploits on the internet has made it easier for attackers to target IACS.
• The other options, B and D, are incorrect because: B. The move towards commercial off-the-shelf (COTS) systems, protocols, and networks actually increases risk because these systems are more likely to be known and targeted by attackers, compared to proprietary systems which might benefit from security through obscurity. D. There is actually an increase in risk with more personnel with system knowledge because it enlarges the attack surface – each individual with system knowledge can potentially become a vector for an attack, either maliciously or accidentally.

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Question # 3

Which is the implementation of PROFIBUS over Ethernet for non-safety-related communications? Available Choices (select all choices that are correct)

A. PROFIBUS DP

B. PROFIBUS PA

C. PROFINET

D. PROF1SAFE

Answer

C. PROFINET

PROFINET is the implementation of PROFIBUS over Ethernet for non-safety-related communications. It is a standard for industrial Ethernet that enables real-time data exchange between automation devices, controllers, and higher-level systems. PROFINET uses standard Ethernet hardware and software, but adds a thin software layer that allows deterministic and fast communication. PROFINET supports different communication profiles for different applications, such as motion control, process automation, and functional safety. PROFINET is compatible with PROFIBUS, and allows seamless integration of existing PROFIBUS devices and networks123

References: 1: What is PROFINET? - PI North America 2: PROFINET - Wikipedia 3: PROFINET Technology and Application - System Description

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Question # 4

Which is a PRIMARY reason why network security is important in IACS environments? Available Choices (select all choices that are correct)

A. PLCs are inherently unreliable.

B. PLCs are programmed using ladder logic.

C. PLCs use serial or Ethernet communications methods.

D. PLCs under cyber attack can have costly and dangerous impacts.

Answer

D. PLCs under cyber attack can have costly and dangerous impacts.

Network security is important in IACS environments because PLCs, or programmable logic controllers, are devices that control physical processes and equipment in industrial settings. PLCs under cyber attack can have costly and dangerous impacts, such as disrupting production, damaging equipment, compromising safety, and harming the environment. Therefore, network security is essential to protect PLCs and other IACS components from unauthorized access, modification, or disruption. The other choices are not primary reasons why network security is important in IACS environments. PLCs are not inherently unreliable, but they can be affected by environmental factors, such as temperature, humidity, and electromagnetic interference. PLCs are programmed using ladder logic, which is a graphical programming language that resembles electrical schematics. PLCs use serial or Ethernet communications methods, depending on the type and age of the device, to communicate with other IACS components, such as human-machine interfaces (HMIs), supervisory control and data acquisition (SCADA) systems, and distributed control systems (DCSs). References:

• ISA/IEC 62443 Standards to Secure Your Industrial Control System training course1
• ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide2
• Using the ISA/IEC 62443 Standard to Secure Your Control Systems3

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Question # 5

In an IACS system, a typical security conduit consists of which of the following assets? Available Choices (select all choices that are correct)

A. Controllers, sensors, transmitters, and final control elements

B. Wiring, routers, switches, and network management devices

C. Ferrous, thickwall, and threaded conduit including raceways

D. Power lines, cabinet enclosures, and protective grounds

Answer

B. Wiring, routers, switches, and network management devices

A security conduit is a logical or physical grouping of communication channels connecting two or more zones that share common security requirements1. A zone is a grouping of systems and components based on their functional, logical, and physical relationship that share common security requirements1. Therefore, a security conduit consists of assets that enable or facilitatecommunication between zones, such as wiring, routers, switches, and network management devices. Controllers, sensors, transmitters, and final control elements are examples of assets that belong to a zone, not a conduit. Ferrous, thickwall, and threaded conduit including raceways are physical structures that may enclose or protect wiring, but they are not part of the communication channels themselves. Power lines, cabinet enclosures, and protective grounds are also not part of the communication channels, but rather provide power or protection to the assets in a zone or a conduit. References: 1: Key Concepts of ISA/IEC 62443: Zones & Security Levels | Dragos

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