An IT service desk is a function that provides technical support and assistance to the users of an organization' s IT systems and services. An IT service desk typically handles issues such as software installation, hardware troubleshooting, network connectivity, password reset, system configuration,and user training. An IT service desk aims to ensure that the IT systems and services are available, reliable, secure, and efficient for the users.
One of the best indications that there are potential problems within an organization's IT service desk function is an excessive backlog of user requests. A backlog is a list of user requests that have not been resolved or completed by the IT service desk within a specified time frame. An excessive backlog means that the IT service desk is unable to meet the demand or expectations of the users, and that the users are experiencing delays, dissatisfaction, or frustration with the IT service desk.
An excessive backlog of user requests can indicate various problems within the IT service desk function, such as:
* Insufficient staff, resources, or capacity to handle the volume or complexity of user requests
* Ineffective processes, procedures, or tools for managing, prioritizing, or resolving user requests
* Lack of skills, knowledge, or training among the IT service desk staff to deal with different types of user requests
* Poor communication, collaboration, or coordination among the IT service desk staff or with other IT functions or stakeholders
* Low quality, performance, or security of the IT systems or services that cause frequent or recurring user issues Therefore, an excessive backlog of user requests is the best indication that there are potential problems within an organization's IT service desk function.
References:
* What is an IT Service Desk? Definition and Functions - Indeed
* The Most Common IT Help Desk Issues - SherpaDesk
* 18 Common IT Help Desk Problems and Solutions - E-Pulse Blog

The impact if corrective actions are not taken is the most important factor to consider when scheduling follow- up audits. An IS auditor should prioritize the follow-up audits based on the risk and potential consequences of not addressing the audit findings and recommendations. The other options are less important factors that may affect the timing and scope of the follow-up audits, but not their necessity or urgency. References:
* CISA Review Manual (Digital Version), Chapter 2, Section 2.5.31
* CISA Review Questions, Answers & Explanations Database, Question ID 207

An external assessment of network vulnerability is a process of identifying and evaluating the weaknesses and risks that affect the security and availability of a network froman outsider's perspective. The most important factor to verify during this process is the completeness of network asset inventory, which is a list of all the devices, systems, and software that are connected to or part of the network. A complete and accurate network asset inventory can help identify the scope and boundaries of the network, the potential attack vectors and entry points, the critical assets and dependencies, and the existing security controls and gaps. Without a complete network asset inventory, an external assessment of network vulnerability may miss some important assets or vulnerabilities, leading to inaccurate or incomplete results and recommendations.
References:
* 1 explains what is an external vulnerability scan and why it is important to have a complete network asset inventory.
* 2 provides a guide on how to conduct a full network vulnerability assessment and emphasizes the importance of knowing the network assets.
* 3 compares internal and external vulnerability scanning and highlights the need for a comprehensive network asset inventory for both types.

A data warehouse is a centralized repository of data that is collected from various sources and organized for analysis and reporting purposes. A data warehouse can help an organization gain insights into its business performance, trends, and opportunities. However, building a data warehouse requires careful planning, design, and implementation to ensure that it meets the needs of the organization.
One of the best practices that would provide management with the most reasonable assurance that a new data warehouse will meet the needs of the organization is A. Integrating data requirements into the system development life cycle (SDLC). The SDLC is a framework that defines the phases and activities involved in developing a software system, such as planning, analysis, design, testing, deployment, and maintenance1. By integrating data requirements into the SDLC, an organization can ensure that the data warehouse is aligned with the business objectives and expectations, and that it delivers value to the end users.
Some of the benefits of integrating data requirements into the SDLC are:
* It helps to identify and prioritize the key business questions and metrics that the data warehouse should support2.
* It helps to define and validate the data sources, models, structures, and quality standards that the data warehouse should follow3.
* It helps to design and implement the data integration, transformation, and loading processes that the data warehouse should use4.
* It helps to test and verify the functionality, performance, and accuracy of the data warehouse before deploying it to production.
* It helps to monitor and maintain the data warehouse after deployment and incorporate feedback and changes as needed.

The IS auditor's next course of action should be to report this control process weakness to senior management, as it may indicate a lack of oversight and accountability for the reporting system. Read-only users may have access to sensitive or confidential information that should be restricted or monitored. Periodic reviews of read-only users are a good practice to ensure that the access rights are still valid and appropriate for the users' roles and responsibilities. Reporting this weakness to senior management will also allow them to take corrective actions or implement compensating controls if needed.
Option A is incorrect because reviewing the list of end users and evaluating for authorization is not the IS auditor's responsibility, but rather the system owner's or administrator's. The IS auditor should only verify that such reviews are performed and documented by the responsible parties.
Option C is incorrect because verifying management's approval for this exemption is not sufficient to address the control process weakness. Even if there is a valid reason for not performing periodic reviews of read-only users, the IS auditor should still report this as a potential risk and recommend mitigating controls.
Option D is incorrect because obtaining a verbal confirmation from IT for this exemption is not adequate evidence or documentation. The IS auditor should obtain written approval from management and verify that it is aligned with the organization's policies and standards.
References:
CISA Review Manual (Digital Version)1, Chapter 1: The Process of Auditing Information Systems, Section
1.4: Audit Evidence, p. 31-32.
CISA Review Manual (Print Version), Chapter 1: The Process of Auditing Information Systems, Section 1.4:
Audit Evidence, p. 31-32.
CISA Online Review Course2, Module 1: The Process of Auditing Information Systems, Lesson 4: Audit Evidence, slide 9-10.
CISA Questions, Answers & Explanations Database3, Question ID: QAE_CISA_710.