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ISA/IEC 62443 Cybersecurity Fundamentals Specialist ISA-IEC-62443 Prüfungsfragen mit Lösungen (Q58-Q63):

58. Frage
Which of the following tools has the potential for serious disruption of a control network and should not be
used on a live system?
Available Choices (select all choices that are correct)

A. FTP
B. Remote desktop
C. Vulnerability scanner
D. Web browser

Antwort: C

59. Frage
Within the National Institute of Standards and Technoloqv Cybersecuritv Framework v1.0 (NIST CSF), what is the status of the ISA 62443 standards?
Available Choices (select all choices that are correct)

A. They are used as normative references.
B. They are used as informative references.
C. They are not used.
D. They are under consideration for future use.

Antwort: B

Begründung:
The NIST CSF is a voluntary framework that provides a set of standards, guidelines, and best practices to help organizations manage cybersecurity risks. The NIST CSF consists of five core functions: Identify, Protect, Detect, Respond, and Recover. Each function is further divided into categories and subcategories that describe specific outcomes and activities. The NIST CSF also provides informative references that link the subcategories to existing standards, guidelines, and practices that can help organizations achieve the desired outcomes. The informative references are not mandatory or exhaustive, but rather serve as examples of possible sources of guidance. The ISA 62443 standards are used as informative references in the NIST CSF v1.0 for several subcategories, especially in the Protect and Detect functions. The ISA 62443 standards are a series of standards that provide a framework for securing industrial automation and control systems (IACS).
The ISA 62443 standards cover various aspects of IACS security, such as terminology, concepts, requirements, policies, procedures, and technical specifications. The ISA 62443 standards are aligned with the NIST CSF in terms of the core functions and the risk-based approach. Therefore, the ISA 62443 standards can provide useful guidance and best practices for organizations that use IACS and want to implement the NIST CSF. References:
* NIST Cybersecurity Framework - Official Site1
* Framework for Improving Critical Infrastructure Cybersecurity - Version 1.02
* ISA/IEC 62443 Standards - Official Site3
* ISA/IEC 62443 Compliance & Scoring | Centraleyes4

60. Frage
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 application ID
B. ATCP/UDP registry number
C. A TCP/UDP host ID
D. ATCP/UDP port number

Antwort: D

Begründung:
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

61. Frage
What does a demilitarized zone (DMZ) provide in network security?

A. Simplified security architecture
B. Secure data transfer
C. Indirect access to the Internet
D. Increased bandwidth

Antwort: C

Begründung:
A demilitarized zone (DMZ) in network architecture provides indirect (controlled and monitored) access to the Internet or untrusted networks, usually by isolating publicly accessible services (like web servers) from internal control networks. This prevents direct exposure of sensitive IACS assets to external threats. While DMZs can support secure data transfer, their primary function is segmentation and indirect access.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3; ISA/IEC 62443-1-1:2007, Section 3.2.6 (Network Security Architectures and DMZ).

62. Frage
Which of the following is an element of security policy, organization, and awareness?
Available Choices (select all choices that are correct)

A. Penetration testing
B. Product development requirements
C. Technical requirement assessment
D. Staff training and security awareness

Antwort: D

Begründung:
According to the ISA/IEC 62443-2-1 standard, security policy, organization, and awareness is one of the four foundational requirements for an IACS security management system. It defines the "policies, procedures, and organizational structure necessary to support the security program" 1. One of the elements of this requirement is staff training and security awareness, which involves "providing appropriate security education and training to all personnel who have access to or are responsible for IACS components" 1. This element aims to ensure that the staff are aware of the security risks, policies, and procedures, and are able to perform their roles and responsibilities in a secure manner. Staff training and security awareness can include topics such as security principles, threats and vulnerabilities, incident response, password management, physical security, and social engineering 2. References:
* ISA/IEC 62443 Series of Standards - ISA
* Security of Industrial Automation and Control Systems - ISAGCA

63. Frage
......

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist ISA-IEC-62443 Prüfungsfragen mit Lösungen (Q58-Q63):

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