Using an entry in the risk register to track the aggregate risk associated with server failure provides a comprehensive view of the impact should the servers simultaneously fail, as it considers the combined effect of the server failure on the enterprise's objectives and operations. The risk register is a document that records and tracks the identified risks, their likelihood, impact, and mitigation strategies. By aggregating the risk associated with server failure, the risk register can help to estimate the worst-case scenario and to prioritize the risk response accordingly. It provides a cost-benefit analysis on control options available for implementation, it provides a view on where controls should be applied to maximize the uptime of servers, and it provides historical information about the impact of individual servers malfunctioning are not the primary benefits of using an entry in the risk register to track the aggregate risk associated with server failure, but rather the possible outcomes or actions of using the risk register. References = CRISC Certified in Risk and Information Systems Control - Question220; ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, question 220.

Optimizing resource utilization is the main reason for prioritizing IT risk responses, as it helps to allocate resources to the most critical and urgent risks. The other options are not the main reasons for prioritizing IT risk responses, although they may be related to the process.

Control effectiveness is best determined throughcontrol testing, which evaluates whether a control operates as intended over time. It includes functional and operational validation under real-world conditions, unlike documentation or design, which only indicate intent.
Reference:CRISC Manual - Domain 4, Slide 388-390

The standard operating procedure (SOP) statement that best illustrates appropriate risk register maintenance is to remove risk when mitigation results in residual risk within tolerance levels. Residual risk is the risk that remains after the risk response or mitigation has been applied. Tolerance levels are the acceptable or allowable ranges of variation or deviation from the expected or desired outcomes or objectives. When the mitigation results in residual risk within tolerance levels, it means that the risk has been reduced or managed to an acceptable or satisfactory level, and that no further action or monitoring is required. Therefore, the risk can be removed from the risk register, as it is no longer a significant or relevant risk for the organization. The other options are not as appropriate as removing risk when mitigation results in residual risk within tolerance levels, as they are related to the transfer, acceptance, or change of the risk, not the removal of the risk. References = Risk and Information Systems Control Study Manual, Chapter 2: IT Risk Assessment, Section 2.4: IT Risk Response, page 87.

A cyber intrusion is an unauthorized or malicious access to a computer system or network by an attacker. A cyber intrusion can compromise the confidentiality, integrity, or availability of the system or network, as well as the data and services that it hosts. A cyber intrusion can also cause damage, disruption, or theft to the organization or its stakeholders. One of the best ways to prevent cyber intrusion is to strengthen vulnerability remediation efforts, which means to identify and fix the weaknesses or flaws in the system or network that can be exploited by the attackers. Vulnerability remediation efforts can include conducting regularvulnerability assessments, applying security patches and updates, configuring security settings and policies, and implementing security controls and measures. By strengthening vulnerability remediation efforts, the organization can reduce the attack surface and the likelihood of cyber intrusion, as well as enhance the resilience and protection of the system or network. The other options are not the best recommendations for preventing cyber intrusion, although they may be helpful and complementary. Establishing a cyber response plan is a technique to prepare for and respond to a cyber incident, such as a cyber intrusion, by defining the roles, responsibilities, procedures, and resources that are needed to manage and recover from the incident.
However, a cyber response plan is a reactive and contingency measure, while strengthening vulnerability remediation efforts is a proactive and preventive measure. Implementing data loss prevention (DLP) tools is a technology that tries to detect and stop sensitive data breaches, or data leakage incidents, in an organization.
DLP tools can help to protect the data from being disclosed to an unauthorized person, whether it is deliberate or accidental. However, DLP tools do not prevent cyber intrusion itself, as they only focus on the data, not the system or network. Implementing network segregation is a method to divide a network into smaller segments or subnetworks, each with its own security policies and controls. Network segregation can help to isolate and contain the impact of a cyber intrusion, as well as to limit the access and movement of the attackers within the network. However, network segregation does not prevent cyber intrusion from occurring, as it does not address thevulnerabilities or flaws in the system or network. References = CRISC Review Manual, pages 164-
1651; CRISC Review Questions, Answers & Explanations Manual, page 902; What Are Security Controls? - F53; Assessing Security Controls: Keystone of the Risk Management ... - ISACA4