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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q35-Q40):

NEW QUESTION # 35
What does Layer 1 of the ISO/OSI protocol stack provide?
Available Choices (select all choices that are correct)

A. User applications specific to network applications such as reading data registers in a PLC
B. Data encryption, routing, and end-to-end connectivity
C. Framing, converting electrical signals to data, and error checking
D. The electrical and physical specifications of the data connection

Answer: D

NEW QUESTION # 36
How many element qroups are in the "Addressinq Risk" CSMS cateqorv?
Available Choices (select all choices that are correct)

A. 0
B. 1
C. 2
D. 3

Answer: B

Explanation:
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

NEW QUESTION # 37
Which policies and procedures publication is titled Patch Manaqement in the IACS Environment?
Available Choices (select all choices that are correct)

A. ISA-62443-3-3
B. ISA-TR62443-2-3
C. ISA-TR62443-1-4
D. ISA-62443-4-2

Answer: B

Explanation:
ISA-TR62443-2-3 is the technical report that describes the requirements for asset owners and industrial automation and control system (IACS) product suppliers that have established and are now maintaining an IACS patch management program. Patch management is the process of applying software updates to fix vulnerabilities, bugs, or performance issues in the IACS components. Patch management is an essential part of maintaining the security and reliability of the IACS environment. The technical report provides guidance on how to establish a patch management policy, how to assess the impact and risk of patches, how to test and deploy patches, and how to monitor and audit the patch management process. References: 1, 2, 3

NEW QUESTION # 38
What do packet filter firewalls examine?
Available Choices (select all choices that are correct)

A. The packet structure and sequence
B. The relationships between packets in a session
C. Only the source, destination, and ports in the header of each packet
D. Every incoming packet up to the application layer

Answer: C

NEW QUESTION # 39
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 # 40
......

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Walt Scott Walt Scott

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