Isaca CISA Practice Test - Questions Answers, Page 25

Including the data warehouse in the impact analysis for any changes in the source system is the best way to prevent data quality issues caused by changes from a source system. A data warehouse is a centralized repository of integrated data from one or more source systems. An impact analysis is a technique of assessing the potential effects and consequences of a change on the existing system or environment. Including the data warehouse in the impact analysis can help to identify and mitigate any data quality issues that may arise from changes in the source system, such as data inconsistency, incompleteness, or inaccuracy. The other options are less effective ways to prevent data quality issues, as they may involve data quality alerts, approval for changes, or access restrictions.Reference:

CISA Review Manual (Digital Version), Chapter 5, Section 5.41

CISA Review Questions, Answers & Explanations Database, Question ID 226

The greatest benefit of using a prototyping approach in software development is that it helps to conceptualize and clarify requirements. A prototyping approach is a method of creating a simplified or partial version of a software product to demonstrate its features and functionality. A prototyping approach can help to elicit, validate, and refine the requirements of the software product, as well as to obtain feedback from the users and stakeholders. The other options are not the greatest benefits of using a prototyping approach, but rather possible outcomes or advantages of doing so.Reference:

CISA Review Manual (Digital Version), Chapter 4, Section 4.3.11

CISA Review Questions, Answers & Explanations Database, Question ID 227

The greatest benefit of using a prototyping approach in software development is that it helps to conceptualize and clarify requirements. A prototyping approach is a method of creating a simplified or partial version of a software product to demonstrate its features and functionality. A prototyping approach can help to elicit, validate, and refine the requirements of the software product, as well as to obtain feedback from the users and stakeholders. The other options are not the greatest benefits of using a prototyping approach, but rather possible outcomes or advantages of doing so.Reference:

CISA Review Manual (Digital Version), Chapter 4, Section 4.3.11

CISA Review Questions, Answers & Explanations Database, Question ID 227

Identifying required IT skill sets that support key business processes is the first step to enable the alignment of IT staff development plans with IT strategy. An IT strategy is a plan that defines how IT will support the organization's goals and objectives. Identifying required IT skill sets means determining the knowledge, abilities, and competencies that IT staff need to perform their roles and responsibilities effectively and efficiently. This can help to align IT staff development plans with IT strategy, as well as to identify and address any skill gaps or needs within the IT workforce. The other options are not the first steps to enable alignment, but rather possible subsequent actions that may depend on the required IT skill sets.Reference:

CISA Review Manual (Digital Version), Chapter 5, Section 5.11

CISA Review Questions, Answers & Explanations Database, Question ID 229

Discovery sampling is an appropriate sampling method for an IS auditor who intends to launch an intensive investigation if one exception is found. Discovery sampling is a type of attribute sampling that determines the sample size based on an acceptable risk of not finding at least one occurrence of an attribute when a given rate of occurrence exists in a population. Discovery sampling can be used by an IS auditor who wants to detect fraud or errors that have a low probability but high impact on an audit objective. The other options are not appropriate sampling methods for this purpose, as they may involve judgmental sampling, variable sampling, or stratified sampling.Reference:

CISA Review Manual (Digital Version), Chapter 2, Section 2.31

CISA Review Questions, Answers & Explanations Database, Question ID 230

Signature-based intrusion detection systems (IDS) are systems that compare network traffic with predefined patterns of known attacks, called signatures. The effectiveness of signature-based IDS depends on how well they can detect new or unknown attacks that are not in their signature database. Therefore, an increase in the number of detected incidents not previously identified is the best indicator of the effectiveness of signature-based IDS, as it shows that they can recognize novel or modified attacks.

Clustering is a technique that allows multiple servers to work together as a single system, providing high availability, load balancing, and fault tolerance. Clustering can limit the potential impact of server failures in a distributed environment, as it can automatically switch the workload to another server in the cluster if one server fails, without interrupting the service. Redundant pathways, failover power, and parallel testing are also useful for improving the reliability and availability of servers, but they do not directly address the issue of server failures.

IT disaster recovery time objectives (RTOs) are the maximum acceptable time that an IT system can be unavailable after a disaster before it causes unacceptable consequences for the business. IT RTOs should be based on the business-defined criticality of the systems, which reflects how important they are for supporting the business processes and functions. The maximum tolerable loss of data, the nature of the outage, and the maximum tolerable downtime (MTD) are also factors that affect the IT RTOs, but they are not the primary basis for determining them.

The audit charter is a document that defines the purpose, scope, authority, and responsibility of an IT audit organization. The audit charter should specify roles and responsibilities within an IT audit organization, such as who is accountable for approving the audit plan, who is responsible for conducting the audits, who is authorized to access the audit evidence, and who is accountable for reporting the audit results. The organizational chart, the engagement letter, and the annual audit plan are also important documents for an IT audit organization, but they do not specify roles and responsibilities as clearly and comprehensively as the audit charter.