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ISA-IEC-62443 Dumps 2024 - New ISA ISA-IEC-62443 Exam Questions
NEW QUESTION # 54
Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)
- A. OPC Classic is an obsolete communication standard.
- B. OPC Classic works with control devices from different manufacturers.
- C. OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535.
- D. OPC Classic is allowed to use only port 80.
Answer: C
Explanation:
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
NEW QUESTION # 55
In a defense-in-depth strategy, what is the purpose of role-based access control?
Available Choices (select all choices that are correct)
- A. Ensures that users can access systems from remote locations
- B. Ensures that users can access only certain devices on the network
- C. Ensures that users correctly manage their username and password
- D. Ensures that users can access only the functions they need for their job
Answer: D
Explanation:
Role-based access control (RBAC) is a method of restricting access to resources based on the roles of individual users within an organization. RBAC assigns permissions and responsibilities to roles, rather than to individual users, and then assigns users to those roles. This way, users can only perform the actions that are relevant and necessary for their role, and not access or modify any other resources that are beyond their scope of authority. RBAC is one of the security countermeasures that can be implemented in a defense-in-depth strategy, which is a layered approach to protect industrial automation and control systems (IACS) from cyber threats. RBAC can help prevent unauthorized access, misuse, or sabotage of IACS resources, as well as reduce the risk of human error or insider attacks.
References:
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 5.3.2.11
* ISA/IEC 62443-2-1:2010, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program, Clause 6.2.2.32
* ISA/IEC 62443-4-1:2018, Security for industrial automation and control systems - Part 4-1: Product security development life-cycle requirements, Clause 5.2.3.23
* ISA/IEC 62443-4-2:2019, Security for industrial automation and control systems - Part 4-2: Technical security requirements for IACS components, Clause 4.2.3.24
NEW QUESTION # 56
Which analysis method is MOST frequently used as an input to a security risk assessment?
Available Choices (select all choices that are correct)
- A. System Safety Analysis(SSA)
- B. Job Safety Analysis(JSA)
- C. Process Hazard Analysis (PHA)
- D. Failure Mode and Effects Analysis
Answer: C
Explanation:
A Process Hazard Analysis (PHA) is a systematic and structured method of identifying and evaluating the potential hazards and risks associated with an industrial process. A PHA can help to identify the possible causes and consequences of undesired events, such as equipment failures, human errors, cyberattacks, natural disasters, etc. A PHA can also provide recommendations for reducing the likelihood and severity of such events, as well as improving the safety and security of the process. A PHA is one of the most frequently used analysis methods as an input to a security risk assessment, as it can help to identify the assets, threats, vulnerabilities, and impacts related to the process, and provide a basis for determining the security risk level and the appropriate security countermeasures. A PHA is also a requirement of the ISA/IEC 62443 standard, as part of the security program development and implementation phase12. References: 1: ISA/IEC 62443-2-1:
Security for industrial automation and control systems: Establishing an industrial automation and control systems security program 2: ISA/IEC 62443-3-2: Security for industrial automation and control systems:
Security risk assessment for system design
NEW QUESTION # 57
What does the abbreviation CSMS round in ISA 62443-2-1 represent?
Available Choices (select all choices that are correct)
- A. Cyber Security Management System
- B. Control System Management System
- C. Control System Monitoring System
- D. Cyber Security Monitoring System
Answer: A
NEW QUESTION # 58
In which layer is the physical address assigned?
Available Choices (select all choices that are correct)
- A. Layer 2
- B. Layer 3
- C. Layer 7
- D. Layer 1
Answer: A
NEW QUESTION # 59
Which characteristic is MOST closely associated with the deployment of a demilitarized zone (DMZ)?
Available Choices (select all choices that are correct)
- A. Internet access through the firewall is allowed.
- B. Level 0 can only interact with Level 1 through the firewall.
- C. Email is prevented, thereby mitigating the risk of phishing attempts.
- D. Level 4 systems must use the DMZ to communicate with Level 3 and below.
Answer: D
NEW QUESTION # 60
Which of the ISA 62443 standards focuses on the process of developing secure products?
Available Choices (select all choices that are correct)
- A. 62443-3-3
- B. 62443-4-1
- C. 62443-1-1
- D. 62443-3-2
Answer: B
Explanation:
The ISA/IEC 62443 series of standards is divided into four main parts, each covering a different aspect of industrial automation and control systems (IACS) cybersecurity1:
* Part 1: Terminology, Concepts, and Models
* Part 2: Policies and Procedures
* Part 3: System Requirements
* Part 4: Component Requirements The part 4 of the series focuses on the requirements for the secure development and maintenance of products that are used in IACS, such as controllers, sensors, actuators, network devices, software applications, and cloud services. The part 4 consists of two standards1:
NEW QUESTION # 61
What are three possible entry points (pathways) that could be used for launching a cyber attack?
Available Choices (select all choices that are correct)
- A. LAN, portable media, and wireless
- B. LAN, portable media, and hard drives
- C. LAN, WAN, and hard drive
- D. LAN, power source, and wireless OD.
Answer: A
Explanation:
A cyber attack is an attempt to compromise the confidentiality, integrity, or availability of a computer system or network by exploiting its vulnerabilities. A cyber attack can be launched from various entry points, which are the pathways that allow an attacker to access a target system or network. According to the ISA/IEC
62443-3-2 standard, which defines a method for conducting a security risk assessment for industrial automation and control systems (IACS), some of the possible entry points for a cyber attack are:
* LAN: A local area network (LAN) is a network that connects devices within a limited geographic area, such as a building or a campus. A LAN can be an entry point for a cyber attack if an attacker gains physical or logical access to the network devices, such as switches, routers, firewalls, or servers. An attacker can use various techniques to access a LAN, such as network scanning, spoofing, sniffing, or hijacking. An attacker can also exploit vulnerabilities in the network protocols, services, or applications that run on the LAN. A cyber attack on a LAN can affect the communication and operation of the devices and systems connected to the network, such as IACS.
* Portable media: Portable media are removable storage devices that can be used to transfer data between different systems or devices, such as USB flash drives, CDs, DVDs, or external hard drives. Portable media can be an entry point for a cyber attack if an attacker uses them to introduce malicious code or data into a target system or device. An attacker can use various techniques to infect portable media, such as autorun, social engineering, or physical tampering. An attacker can also exploit vulnerabilities in the operating systems, drivers, or applications that interact with portable media. A cyber attack using portable media can affect the functionality and security of the systems or devices that use them, such as IACS.
* Wireless: Wireless is a technology that enables communication and data transmission without physical wires or cables, such as Wi-Fi, Bluetooth, or cellular networks. Wireless can be an entry point for a cyber attack if an attacker intercepts, modifies, or disrupts the wireless signals or data. An attacker can use various techniques to access wireless networks or devices, such as cracking, jamming, or eavesdropping. An attacker can also exploit vulnerabilities in the wireless protocols, standards, or encryption methods. A cyber attack on wireless can affect the availability and reliability of the wireless communication and data transmission, such as IACS.
Therefore, LAN, portable media, and wireless are three possible entry points that could be used for launching a cyber attack. References:
* Cybersecurity Risk Assessment According to ISA/IEC 62443-3-21
* ISA/IEC 62443 Series of Standards2
NEW QUESTION # 62
Which of the following ISA-99 (IEC 62443) Reference Model levels is named correctly?
Available Choices (select all choices that are correct)
- A. Level 3: Operations Management
- B. Level 4: Process
- C. Level 2: Quality Control
- D. Level 1: Supervisory Control
Answer: A
NEW QUESTION # 63
Multiuser accounts and shared passwords inherently carry which of the followinq risks?
Available Choices (select all choices that are correct)
- A. Buffer overflow
- B. Unauthorized access
- C. Privilege escalation
- D. Race conditions
Answer: B,C
Explanation:
Multiuser accounts and shared passwords are accounts and passwords that are used by more than one person to access a system or a resource. They inherently carry the risk of unauthorized access, which means that someone who is not authorized or intended to use the account or password can gain access to the system or resource, and potentially compromise its confidentiality, integrity, or availability. For example, if a multiuser account and password are shared among several operators of an industrial automation and control system (IACS), an attacker who obtains the password can use the account to access the IACS and perform malicious actions, such as changing the system settings, deleting data, or disrupting the process. Multiuser accounts and shared passwords also make it difficult to track and audit the activities of individual users, and to enforce the principle of least privilege, which states that users should only have the minimum level of access required to perform their tasks. Therefore, the ISA/IEC 62443 standards recommend avoiding the use of multiuser accounts and shared passwords, and instead using individual accounts and strong passwords for each user, and implementing authentication and authorization mechanisms to control the access to the IACS. References:
* ISA/IEC 62443-3-3:2013 - Security for industrial automation and control systems - Part 3-3: System security requirements and security levels1
* ISA/IEC 62443-2-1:2009 - Security for industrial automation and control systems - Part 2-1:
Establishing an industrial automation and control systems security program2
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course3
Shared passwords and multiuser accounts pose specific risks, notably unauthorized access and privilege escalation. In ISA/IEC 62443's framework, these practices are discouraged because they complicate the attribution of actions to individual users and increase the likelihood that accounts can be used beyond their intended scope. Unauthorized access occurs when individuals exploit the shared nature of an account to gain entry to systems or data that they should not access. Privilege escalation can happen when users leverage shared accounts to perform actions at higher permission levels than those assigned to their personal accounts.
Conversely, buffer overflows and race conditions are types of vulnerabilities or programming errors, not directly associated with the risks of multiuser accounts or shared passwords.
NEW QUESTION # 64
Which is an important difference between IT systems and IACS?
Available Choices (select all choices that are correct)
- A. The IT security priority is availability.
- B. Routers are not used in IACS networks.
- C. IACS cybersecurity must address safety issues.
- D. The IACS security priority is integrity.
Answer: C,D
NEW QUESTION # 65
Which is a commonly used protocol for managing secure data transmission on the Internet?
Available Choices (select all choices that are correct)
- A. Microsoft Point-to-Point Encryption
- B. Secure Telnet
- C. Datagram Transport Layer Security (DTLS)
- D. Secure Sockets Layer
Answer: D
NEW QUESTION # 66
Who must be included in a training and security awareness program?
Available Choices (select all choices that are correct)
- A. Temporary staff
- B. Vendors and suppliers
- C. Employees
- D. All personnel
Answer: D
Explanation:
Modbus over Ethernet, also known as Modbus/TCP, is a protocol that encapsulates the Modbus/RTU data string inside the data section of the TCP frame. It then sets up a client/server exchange between nodes, using TCP/IP addressing to establish connections1. This makes it easy to manage in a firewall, because the firewall can filter the traffic based on the source and destination IP addresses and the TCP port number. The default TCP port for Modbus/TCP is 502, but it can be changed if needed. Modbus/TCP does not use any other ports or protocols, so the firewall rules can be simple and specific. References:
* 8: Open Modbus/TCP Specification, RTA Automation, 2010.
* [9]: Modbus Application Protocol Specification V1.1b3, Modbus Organization, 2012.
NEW QUESTION # 67
What are three possible entry points (pathways) that could be used for launching a cyber attack?
Available Choices (select all choices that are correct)
- A. LAN, portable media, and wireless
- B. LAN, portable media, and hard drives
- C. LAN, WAN, and hard drive
- D. LAN, power source, and wireless OD.
Answer: A
NEW QUESTION # 68
Which layer specifies the rules for Modbus Application Protocol
Available Choices (select all choices that are correct)
- A. Data link layer
- B. Session layer
- C. Application layer
- D. Presentation layer
Answer: C
NEW QUESTION # 69
Which of the following refers to internal rules that govern how an organization protects critical system resources?
Available Choices (select all choices that are correct)
- A. Formal guidance
- B. Security policy
D- Code of conduct - C. Legislation
Answer: B
Explanation:
A security policy refers to internal rules that govern how an organization protects critical system resources, such as industrial control systems (ICS). A security policy defines the objectives, scope, roles, responsibilities, and requirements for securing the ICS environment, as well as the procedures and guidelines for implementing, monitoring, and enforcing the security measures. A security policy also establishes the baseline for assessing and managing the security risks to the ICS, and for ensuring compliance with relevant standards, regulations, and best practices. A security policy is a key component of the ICS security program, and it should be documented, communicated, and reviewed regularly.
The other choices are not correct because:
* A. Formal guidance. Formal guidance refers to external sources of information and recommendations that can help an organization improve its ICS security posture, such as standards, frameworks, guidelines, and best practices. Formal guidance is not an internal rule, but rather a reference that can be used to develop, implement, and evaluate the security policy and controls. For example, the ISA/IEC
62443 series of standards provide formal guidance on how to secure ICS from cyber threats1.
* B. Legislation. Legislation refers to external laws and regulations that impose legal obligations and penalties on an organization for its ICS security performance, such as the NERC CIP standards for the electric sector2, or the EU NIS Directive for critical infrastructure operators3. Legislation is not an internal rule, but rather a compliance requirement that must be met by the organization. Legislation may also influence the security policy and controls, as the organization needs to align its security objectives and practices with the legal expectations and consequences.
* D. Code of conduct. A code of conduct refers to a set of ethical principles and values that guide the
* behavior and decision-making of an organization and its employees, such as honesty, integrity, respect, and accountability. A code of conduct is not an internal rule for protecting critical system resources, but rather a general norm for conducting business and maintaining a positive reputation. A code of conduct may also support the security policy and culture, as it can foster a sense of responsibility and trust among the ICS stakeholders.
References:
* 1: ISA/IEC 62443 Standards to Secure Your Industrial Control System
* 2: NERC Critical Infrastructure Protection Standards
* 3: EU Network and Information Systems Directive
NEW QUESTION # 70
Which of the following is an element of security policy, organization, and awareness?
Available Choices (select all choices that are correct)
- A. Product development requirements
- B. Staff training and security awareness
- C. Technical requirement assessment
- D. Penetration testing
Answer: C
NEW QUESTION # 71
Which is one of the PRIMARY goals of providing a framework addressing secure product development life-cycle requirements?
Available Choices (select all choices that are correct)
- A. Aligned development process
- B. Defense-in-depth approach to designing
- C. Aligned needs of industrial users
- D. Well-documented security policies and procedures
Answer: D
Explanation:
One of the primary goals of providing a framework that addresses secure product development lifecycle requirements is to ensure that security policies and procedures are well-documented. This objective is crucial because it establishes a structured and standardized approach to security that is integrated throughout the development process of software or systems. This framework helps in aligning the development process with security best practices, thereby mitigating risks associated with security vulnerabilities. Documentation of security policies and procedures ensures that security considerations are consistently applied and that compliance with relevant standards, such as ISA/IEC 62443, is maintained. This foundational approach supports the overall security posture by embedding security considerations directly into the lifecycle of product development, rather than addressing security as an afterthought.
NEW QUESTION # 72
What are the two sublayers of Layer 2?
Available Choices (select all choices that are correct)
- A. VLAN and VPN
- B. HIDS and NIDS
- C. LLC and MAC
- D. OPC and DCOM
Answer: C
NEW QUESTION # 73
At Layer 4 of the Open Systems Interconnection (OSI) model, what identifies the application that will handle a packet inside a host?
Available Choices (select all choices that are correct)
- A. ATCP/UDP port number
- B. A TCP/UDP host ID
- C. ATCP/UDP application ID
- D. ATCP/UDP registry number
Answer: A
Explanation:
At layer 4 of the OSI model, also known as the transport layer, the application that will handle a packet inside a host is identified by a TCP/UDP port number. A port number is a 16-bit integer that is assigned to a specific application or service that runs on a host. Port numbers are used to multiplex and demultiplex the data streams that are exchanged between hosts and end systems. Multiplexing is the process of combining multiple data streams into one, while demultiplexing is the process of separating one data stream into multiple ones. Port numbers are part of the header of the transport layer protocol data unit (PDU), which is called a segment for TCP and a datagram for UDP. The header contains the source port number and the destination port number, which indicate the applications that are involved in the communication. For example, if a host sends a packet to another host using the HTTP protocol, which runs on port 80 by default, the source port number would be a random number chosen by the sender, and the destination port number would be 80. The receiver would then use the destination port number to demultiplex the packet and deliver it to the HTTP application.
Port numbers are divided into three ranges: well-known ports (0-1023), registered ports (1024-49151), and dynamic or private ports (49152-65535). Well-known ports are reserved for common and standardized applications and services, such as HTTP (80), FTP (21), and SSH (22). Registered ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific applications and services that request them, such as Skype (49175) and Minecraft (25565). Dynamic or private ports are not assigned by any authority and can be used by any application or service that needs them, such as ephemeral ports that are used for temporary connections.
The other options are not valid identifiers for the application that will handle a packet inside a host at layer 4 of the OSI model. A TCP/UDP application ID is not a term that is used in the OSI model or the TCP/IP model.
A TCP/UDP host ID is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 3, which is the network layer, where the host is identified by an IP address. A TCP/UDP registry number is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 5, which is the session layer, where the registry number is used to identify a session between two hosts.
References:
* Transport Layer | Layer 4 | The OSI-Model1
* OSI model - Wikipedia2
* What is Layer 4 of the OSI Model? | Glossary | A10 Networks3
* What Are the 7 Layers of the OSI Model? | Webopedia4
NEW QUESTION # 74
What is the definition of "defense in depth" when referring to
Available Choices (select all choices that are correct)
- A. Requiring a minimum distance requirement between security assets
- B. Using countermeasures that have intrinsic technical depth.
- C. Applying multiple countermeasures in a layered or stepwise manner
- D. Aligning all resources to provide a broad technical gauntlet
Answer: C
NEW QUESTION # 75
What does Layer 1 of the ISO/OSI protocol stack provide?
Available Choices (select all choices that are correct)
- A. The electrical and physical specifications of the data connection
- B. User applications specific to network applications such as reading data registers in a PLC
- C. Data encryption, routing, and end-to-end connectivity
- D. Framing, converting electrical signals to data, and error checking
Answer: A
NEW QUESTION # 76
What is OPC?
Available Choices (select all choices that are correct)
- A. A vendor-specific proprietary protocol for the communication of real-time plant data between control devices
- B. An open standard protocol for the communication of real-time data between devices from different
manufacturers - C. An open standard serial communications protocol widely used in industrial manufacturing environments
- D. An open standard protocol for real-time field bus communication between automation technology
devices
Answer: B
NEW QUESTION # 77
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?
- A. If a medium priority, schedule the installation within three months after receipt.
- B. If a high priority, apply the patch at the first unscheduled outage.
- C. If a low priority, there is no need to apply the patch.
- D. If no problems are experienced with the current IACS, it is not necessary to apply the patch.
Answer: B
Explanation:
According to the ISA/IEC 62443 Cybersecurity Fundamentals Specialist resources, patches are software updates that fix bugs, vulnerabilities, or improve performance of a system. Patches are classified into three categories based on their urgency and impact: low, medium, and high. Low priority patches are those that have minimal or no impact on the system functionality or security, and can be applied at the next scheduled maintenance. Medium priority patches are those that have moderate impact on the system functionality or security, and should be applied within a reasonable time frame, such as three months. High priority patches are those that have significant or critical impact on the system functionality or security, and should be applied as soon as possible, preferably at the first unscheduled outage. Applying patches in a timely manner is a best practice for maintaining the security and reliability of an industrial automation and control system (IACS).
References:
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 4.3.2, Patch Management
* ISA/IEC 62443-2-1:2009, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program, Clause 5.3.2.2, Patch management
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 4.3.3.6.2, Patch management
NEW QUESTION # 78
Which of the following is the BEST reason for periodic audits?
Available Choices (select all choices that are correct)
- A. To validate that security policies and procedures are performing
- B. To confirm audit procedures
- C. To adhere to a published or approved schedule
- D. To meet regulations
Answer: A
NEW QUESTION # 79
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