ISA ISA-IEC-62443 Exam With Confidence Using Practice Dumps

ISA/IEC TR 62443-1-5 defines the rules for creating cybersecurity profiles. The key principle is preservation of standard integrity.

Step 1: Purpose of profiles

Profiles allow selection and scoping of existing requirements for specific industries or applications.

Step 2: Restriction on modification

The technical report explicitly states that no new security requirements may be added, and existing requirements must not be altered. This ensures interoperability, auditability, and certification consistency.

Step 3: Correct approach

Profiles may select, exclude, or contextualize requirements, but they cannot redefine them.

Therefore, Option C is correct.

ISA/IEC 62443 recommends using a firewall to segment and protect the plant floor (Operational Technology or OT network) from the rest of the company’s Information Technology (IT) networks. Firewalls enforce security policies by controlling and monitoring traffic, helping to prevent unauthorized access and potential threats from traversing between business and control networks. Hubs and switches do not provide security; routers may offer some basic filtering, but firewalls are explicitly designed for this purpose.

Secure Sockets Layer (SSL) is no longer considered secure due to known vulnerabilities and cryptographic weaknesses. Modern standards require the use of newer versions of Transport Layer Security (TLS), and similarly, DES is deprecated for strong security. However, the best and most universally referenced example is SSL, as major industry and regulatory bodies recommend disabling SSL entirely in favor of TLS 1.2 or above.