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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q60-Q65):

NEW QUESTION # 60
What is a feature of an asymmetric key?
Available Choices (select all choices that are correct)

A. Uses different keys
B. Has lower network overhead
C. Shares the same key OD.
D. Uses a continuous stream

Answer: A

NEW QUESTION # 61
Which of the following attacks relies on a human weakness to succeed?
Available Choices (select all choices that are correct)

A. Escalation-of-privileges
B. Denial-of-service
C. Phishing
D. Spoofing

Answer: C

Explanation:
Phishing is a type of cyberattack that relies on a human weakness to succeed. Phishing is the practice of sending fraudulent emails or other messages that appear to come from a legitimate source, such as a bank, a government agency, or a trusted person, in order to trick the recipient into revealing sensitive information, such as passwords, credit card numbers, or personal details, or into clicking on malicious links or attachments that may install malware or ransomware on their devices. Phishing is a common and effective way of compromising the security of industrial automation and control systems (IACS), as it can bypass technical security measures by exploiting the human factor. Phishing can also be used to gain access to the IACS network, to conduct reconnaissance, to launch further attacks, or to cause damage or disruption to the IACS operations. The ISA/IEC 62443 series of standards recognize phishing as a potential threat vector for IACS and provide guidance and best practices on how to prevent, detect, and respond to phishing attacks. Some of the recommended countermeasures include:
* Educating and training the IACS staff on how to recognize and avoid phishing emails and messages, and how to report any suspicious or malicious activity.
* Implementing and enforcing policies and procedures for email and message security, such as using strong passwords, verifying the sender's identity, and not opening or clicking on unknown or unsolicited links or attachments.
* Applying technical security controls, such as antivirus software, firewalls, spam filters, encryption, and authentication, to protect the IACS devices and network from phishing attacks.
* Monitoring and auditing the IACS network and devices for any signs of phishing attacks, such as
* anomalous or unauthorized traffic, connections, or activities, and taking appropriate actions to contain and mitigate the impact of any incidents. References:
* ISA/IEC 62443-1-1:2009, Security for industrial automation and control systems - Part 1-1:
Terminology, concepts and models1
* 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 62443-2-4:2015, Security for industrial automation and control systems - Part 2-4: Security program requirements for IACS service providers3
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels4
* ISA/IEC 62443-4-2:2019, Security for industrial automation and control systems - Part 4-2: Technical security requirements for IACS components5

NEW QUESTION # 62
Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)

A. OPC Classic is allowed to use only port 80.
B. OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535.
C. OPC Classic works with control devices from different manufacturers.
D. OPC Classic is an obsolete communication standard.

Answer: B

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 # 63
As related to IACS Maintenance Service Providers, when do maintenance activities generally start?

A. During the design phase
B. At the beginning of the project
C. After the handover of the solution
D. Before the handover of the solution

Answer: C

Explanation:
Maintenance service activities typically begin after the system is deployed and handed over to the asset owner. This is aligned with the Operation and Maintenance phase of the IACS lifecycle.
"Maintenance service providers typically become responsible for cybersecurity-related activities after the asset owner takes ownership of the system, following handover."
- ISA/IEC 62443-2-4:2015, Clause 4.2.3 - Transition and Handover
Prior to handover, integrators and product suppliers manage the system. Maintenance providers take over only post-commissioning.
References:
ISA/IEC 62443-2-4:2015 - Clause 4.2.3
ISA/IEC 62443-1-1 - IACS lifecycle phases

NEW QUESTION # 64
Which of the following is an activity that should trigger a review of the CSMS?
Available Choices (select all choices that are correct)

A. Budgeting
B. Security incident exposing previously unknown risk.
C. New technical controls
D. Organizational restructuring

Answer: B

NEW QUESTION # 65
......

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