Impact analysis is the aspect of risk management that involves identifying the potential reputational and financial harm when an incident occurs. Impact analysis is the process of estimating the consequences or effects of a risk event on the business objectives, operations, processes, or functions. Impact analysis helps to measure and quantify the severity or magnitude of the risk event, as well as to prioritize and rank the risks based on their impact. Impact analysis also helps to determine the appropriate level of response and mitigation for each risk event, as well as to allocate the necessary resources and budget for risk management123.
Likelihood (A) is not the aspect of risk management that involves identifying the potential reputational and financial harm when an incident occurs. Likelihood is the aspect of risk management that involves estimating the probability or frequency of a risk event occurring. Likelihood is the process of assessing and evaluating the factors or causes that may trigger or influence a risk event, such as threats, vulnerabilities, assumptions, uncertainties, etc. Likelihood helps to measure and quantify the chance or possibility of a risk event happening, as well as to prioritize and rank the risks based on their likelihood123.
Mitigation (B) is not the aspect of risk management that involves identifying the potential reputational and financial harm when an incident occurs. Mitigation is the aspect of risk management that involves reducing or minimizing the likelihood or impact of a risk event. Mitigation is the process of implementing and applying controls or actions that can prevent, avoid, transfer, or accept a risk event, depending on the risk appetite and tolerance of the organization. Mitigation helps to improve and enhance the security and resilience of the organization against potential risks, as well as to optimize the cost and benefit of risk management123.
Residual risk © is not the aspect of risk management that involves identifying the potential reputational and financial harm when an incident occurs. Residual risk is the aspect of risk management that involves measuring and monitoring the remaining or leftover risk after mitigation. Residual risk is the process of evaluating and reviewing the effectiveness and efficiency of the mitigation controls or actions, as well as identifying and addressing any gaps or issues that may arise. Residual risk helps to ensure that the actual level of risk is aligned with the desired level of risk, as well as to update and improve the risk management strategy and plan123. Reference := Risk Analysis: A Comprehensive Guide | SafetyCulture Risk Assessment and Analysis Methods: Qualitative and Quantitative - ISACA Risk Management Process - Risk Management | Risk Assessment | Risk ...

The correct answer is B. Network security is the type of control that best matches the control description given in the question. Network security involves designing and configuring network environments and virtual instances to restrict and monitor traffic between trusted and untrusted connections, such as firewalls, routers, switches, VPNs, and network segmentation. Network security also requires periodic reviews and documentation of the network configurations and the justification for the allowed services, protocols, ports, and compensating controls.
The other options are not directly related to the question. Option A, virtual instance and OS hardening, refers to the process of applying security configurations and patches to virtual instances and operating systems to reduce their attack surface and vulnerabilities. Option C, network vulnerability management, refers to the process of identifying, assessing, prioritizing, and remediating network vulnerabilities using tools such as scanners, analyzers, and testers. Option D, change detection, refers to the process of monitoring and detecting changes in the system or network environment that could affect the security posture or performance of the system or network.
Reference:
IVS-01: Network Security - CSF Tools - Identity Digital1
Certificate of Cloud Auditing Knowledge (CCAK) Study Guide, Chapter 6: Cloud Security Controls Cloud Controls Matrix (CCM) - CSA2

Identity and access management (IAM) and data protection are the areas that should be reviewed when auditing a public cloud, as they are the key aspects of cloud security and compliance that affect both the cloud service provider and the cloud service customer. IAM and data protection refer to the methods and techniques that ensure the confidentiality, integrity, and availability of data and resources in the cloud environment. IAM involves the use of credentials, policies, roles, permissions, and tokens to verify the identity and access rights of users or devices. Data protection involves the use of encryption, backup, recovery, deletion, and retention to protect data from unauthorized access, modification, loss, or disclosure123.
Patching and configuration (A) are not the areas that should be reviewed when auditing a public cloud, as they are not the key aspects of cloud security and compliance that affect both the cloud service provider and the cloud service customer. Patching and configuration refer to the processes and practices that ensure the security, reliability, and performance of the cloud infrastructure, platform, or software. Patching involves the use of updates or fixes to address vulnerabilities, bugs, errors, or exploits that may compromise or affect the functionality of the cloud components. Configuration involves the use of settings or parameters to customize or optimize the functionality of the cloud components. Patching and configuration are mainly under the responsibility of the cloud service provider, as they own and operate the cloud infrastructure, platform, or software. The cloud service customer has limited or no access or control over these aspects123.
Vulnerability management and cyber security reviews (B) are not the areas that should be reviewed when auditing a public cloud, as they are not specific or measurable aspects of cloud security and compliance that can be easily audited or tested. Vulnerability management and cyber security reviews refer to the processes and practices that identify, assess, treat, monitor, and report on the risks that affect the security posture of an organization or a domain. Vulnerability management involves the use of tools or techniques to scan, analyze, prioritize, remediate, or mitigate vulnerabilities that may expose an organization or a domain to threats or attacks. Cyber security reviews involve the use of tools or techniques to evaluate, measure, benchmark, or improve the security capabilities or maturity of an organization or a domain. Vulnerability management and cyber security reviews are general or broad terms that encompass various aspects of cloud security and compliance, such as IAM, data protection, patching, configuration, etc. Therefore, they are not specific or measurable areas that can be audited or tested individually123.
Source code reviews and hypervisor (D) are not the areas that should be reviewed when auditing a public cloud, as they are not relevant or accessible aspects of cloud security and compliance for most cloud service customers. Source code reviews refer to the processes and practices that examine the source code of software applications or systems to identify errors, bugs, vulnerabilities, or inefficiencies that may affect their quality, functionality, or security. Hypervisor refers to the software that allows the creation and management of virtual machines on a physical server. Source code reviews and hypervisor are mainly under the responsibility of the cloud service provider, as they own and operate the software applications or systems that deliver cloud services. The cloud service customer has no access or control over these aspects123. Reference := Cloud Audits: A Guide for Cloud Service Providers - Cloud Standards ...
Cloud Audits: A Guide for Cloud Service Customers - Cloud Standards ...
Cloud Auditing Knowledge: Preparing for the CCAK Certificate Exam

Attribute-based access control (ABAC) is a cloud-native solution that uses attributes (such as user role, location, or device) to dynamically control access. This method is highly flexible for the cloud, where user attributes and environmental factors vary, unlike traditional enterprise security models. ISACA's CCAK emphasizes ABAC in cloud environments for its adaptability to multi-tenant architectures and complex access control requirements, aligning with CCM controls in Domain IAM-12 (Identity and Access Management) for flexible, secure access mechanisms.