The best recommendation to reduce the risk associated with potential system compromise when a vendor stops releasing security patches and updates for a business-critical legacy system is to segment the system on its own network. Network segmentation is the process of dividing a network into smaller subnetworks or segments, based on different criteria, such as function, location, or security level. Network segmentation helps to isolate the system from the rest of the network, and limit the exposure and access to the system. Network segmentation also helps to improve the performance and security of the network, by reducing the network traffic and congestion, and enhancing the monitoring and control capabilities. The other options are not as effective as segmenting the system on its own network, although they may provide some additional protection or recovery options. Ensuring regular backups take place, virtualizing the system in the cloud, and installing antivirus software on the system are all measures that can help to reduce the risk of data loss or system damage, but they do not address the root cause of the risk, which is the lack of security patches and updates for the system. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, page
3-11.

Section: Volume D

Section: Volume D
Explanation

The most comprehensive information for developing a risk profile for a system is the risk assessment results.
A risk assessment is a process that identifies, analyzes, and evaluates the risks that could affect the system's objectives or operations. A risk assessment provides comprehensive information for developing a risk profile, because it helps to determine the likelihood and impact of the risks, and to prioritize them based on their severity and relevance. A risk assessment also helps to select the most appropriate and effective controls to minimize the risks, such as avoiding, reducing, transferring, or accepting the risks. A risk profile is a document that summarizes the key risks that the system faces or accepts, and their likelihood, impact, and priority. A risk profile helps to identify and prioritize the most critical or relevant risks, and to align them with the system's objectives, strategy, and risk appetite. The other options are not as comprehensive as the risk assessment results, although they may be part of or derived from the risk profile. Results of a business impact analysis (BIA), a mapping of resources to business processes, and key performance indicators (KPIs) are all factors that could affect the system's performance and improvement, but they do not necessarily identify, analyze, or evaluate the risks that could affect the system. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.2.1, page 4-13.

Risk scenarios are hypothetical situations that describe potential events or actions that could affect the achievement of enterprise objectives. The design of relevant risk scenarios should consider the following factors: the risk appetite and tolerance of the enterprise, the key risk indicators and risk drivers, the potential impact and likelihood of the scenarios, and the alignment with the risk management capabilities of the enterprise. The scenarios should be realistic, plausible, and consistent with the enterprise's context and objectives. The scenarios should also be reviewed and updated periodically to reflect changes in the internal and external environment. The alignment with the risk management capabilities is the most critical factor, as it ensures that the scenarios are relevant for the decision making and risk response processes of the enterprise. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 2, Section
2.3.3.2, pp. 67-69.