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ISA-IEC-62443 Testantworten - ISA-IEC-62443 Deutsch Prüfungsfragen

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist ISA-IEC-62443 Prüfungsfragen mit Lösungen (Q12-Q17):

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

Antwort: C

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

13. Frage
To which category of the ISA-62443 (IEC 62443) series does the document titled "Patch management in the IACS environment" belong?

A. General
B. Component
C. System
D. Policies and Procedures

Antwort: D

Begründung:
The ISA/IEC 62443 series organizes documents into categories: General, Policies and Procedures, System, and Component. The document titled "Patch management in the IACS environment" is part of the Policies and Procedures group (specifically, ISA/IEC 62443-2-3). This group addresses processes, procedures, and organizational measures for cybersecurity in industrial automation and control systems (IACS), including topics like patch management, which deals with evaluating, testing, and installing updates or patches to reduce vulnerabilities in control systems.
Reference: ISA/IEC 62443-2-3:2015, Introduction and Scope; ISA/IEC 62443-1-1:2007, Section 4.1.2.

14. Frage
Which NIST Special Publication focuses specifically on securing Industrial Control Systems (ICS)?

A. SP 800-53
B. SP 800-171
C. SP 800-82
D. SP 800-30

Antwort: C

Begründung:
NIST SP 800-82 is the definitive guidance for securing Industrial Control Systems (ICS), including SCADA, DCS, and PLC-based systems.
"NIST Special Publication 800-82 provides guidance on how to secure ICS, including supervisory control and data acquisition (SCADA) systems, distributed control systems (DCS), and other control system configurations."
- NIST SP 800-82 Rev. 2, Executive Summary
While:
SP 800-30 focuses on risk assessment
SP 800-53 provides general security controls for federal systems
SP 800-171 targets controlled unclassified information (CUI) in non-federal systems Only SP 800-82 specifically addresses ICS/OT environments.
References:
NIST SP 800-82 Rev. 2 - Executive Summary
ISA/IEC 62443-2-1 - Acknowledges cross-reference with NIST guidance

15. Frage
What does the expression SL-T (BPCS Zone) vector {2 2 0 1 3 1 3} represent?

A. The FR values for a specific zone's security level
B. The SL values for a specific zone's foundational requirements
C. A single protection factor for all FRS
D. A qualitative risk assessment method

Antwort: B

Begründung:
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.
References:
ISA/IEC 62443-3-3:2013 - Annex A
ISA/IEC 62443-3-2 - SL-T Vector usage in risk assessment

16. Frage
Which of the following PRIMARILY determines access privileges for user accounts?
Available Choices (select all choices that are correct)

A. Authorization security policy
B. Common practice
C. Users' desire for ease of use
D. Technical capability

Antwort: A

Begründung:
Authorization security policy is the primary factor that determines access privileges for user accounts. Authorization security policy is the function of specifying access rights or privileges to resources, which is related to general information security and computer security, and to accesscontrol in particular1.
Authorization security policy defines who can access what resources, under what conditions, and for what purposes. Authorization security policy should be aligned with the business objectives and security requirements of the organization, and should be enforced by appropriate mechanisms and controls. Authorization security policy should also be reviewed and updated regularly to reflect changes in the environment, threats, and risks2. Authorization security policy is an essential part of the ISA/IEC 62443 standard, which provides a framework for securing industrial automation and control systems (IACS). The standard defines four security levels (SL) that represent the degree of protection against threats, and specifies the security capabilities that should be implemented for each SL. The standard also provides guidance on how to conduct a security risk assessment, how to define security zones and conduits, and how to apply security policies and procedures to the IACS environment34 . References:https://bing.com/search?q=authorization+security+policy
https://learn.microsoft.com/en-us/aspnet/core/security/authorization/policies?view=aspnetcore-7.0

17. Frage
......

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