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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q42-Q47):
NEW QUESTION # 42
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)
Answer: C
NEW QUESTION # 43
Which is a reason for
and physical security regulations meeting a mixed resistance?
Available Choices (select all choices that are correct)
Answer: B
NEW QUESTION # 44
Which is a role of the application layer?
Available Choices (select all choices that are correct)
Answer: C,D
Explanation:
The application layer is the topmost layer of the OSI model, which provides the interface between the user and the network. It includes protocols specific to network applications such as email, file transfer, and reading data registers in a PLC. These protocols deliver and format information, possibly with encryption and security, to ensure reliable and meaningful communication between different applications. The application layer does not include user applications, which are separate from the network protocols. The application layer also does not provide the mechanism for opening, closing, and managing a session between end-user application processes, which is the function of the session layer. References:
ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, page 181 Using the ISA/IEC 62443 Standards to Secure Your Control System, page 82 The application layer in network protocols, such as in the OSI model or the TCP/IP protocol suite, is primarily responsible for providing services directly to user applications. This layer is involved in:
Option A: Including protocols specific to network applications such as email, file transfer, and industrial protocols like reading data registers in a Programmable Logic Controller (PLC). This is a core function of the application layer as it facilitates specific high-level networking capabilities.
Option D: Delivering and formatting information, which can include encryption and ensuring the security of data as it is transmitted across the network. This includes protocols like HTTP for web browsing which can encrypt data via HTTPS, SMTP for secure email transmission, and FTP for secure file transfer.
NEW QUESTION # 45
Which of the following is NOT a general class of firewalls?
Answer: C
Explanation:
The three general classes of firewalls are:
Packet Filtering Firewalls - Basic filters based on IPs, ports, protocols Stateful Inspection Firewalls - Track active connections and session state Application Proxy Firewalls - Act as intermediaries at the application layer
"Network inspection" is not a standard firewall classification, but rather a general term that may refer to DPI (Deep Packet Inspection) or NIDS (Network Intrusion Detection Systems).
"Firewall technologies are typically classified into packet filtering, stateful inspection, and application proxy types."
- ISA/IEC 62443-3-3:2013, SR 5.1 - Zone Boundary Protection
References:
ISA/IEC 62443-3-3:2013 - Clause SR 5.1
NIST SP 800-41 - Guidelines on Firewalls and Firewall Policy
NEW QUESTION # 46
Which is the BEST deployment system for malicious code protection?
Available Choices (select all choices that are correct)
Answer: A
NEW QUESTION # 47
......
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