CISA-KR 문제 246
The most critical factor for the success of an information security program is management's commitment to information security. Management's commitment to information security means that the senior management supports, sponsors, funds, monitors and enforces the information security program within the organization.
Management's commitment to information security also demonstrates leadership, sets the tone and culture, and establishes the strategic direction and objectives for information security. User accountability for information security, alignment of information security with IT objectives, and integration of business and information security are also important factors for the success of an information security program, but they are not as critical as management's commitment to information security, as they depend on or derive from it.
References: Info Technology & Systems Resources | COBIT, Risk, Governance ... - ISACA, IT Governance and Process Maturity
CISA-KR 문제 247
Segregation of duties (SoD) is a key internal control that aims to prevent fraud and errors by ensuring that no single individual can perform incompatible or conflicting tasks within a business process. SoD reduces the risk of unauthorized or improper transactions, manipulation of data, or misappropriation of assets.
In the accounts payable department, SoD involves separating the following functions: invoice processing, payment authorization, payment execution, and reconciliation. For example, the person who approves an invoice should not be the same person who issues the payment or reconciles the bank statement.
One of the best ways to ensure appropriate SoD within the accounts payable department is to restrict program functionality according to user security profiles. This means that each user of the accounts payable system should have a unique login and password, and should only have access to the functions that are relevant to their role and responsibilities. For instance, an invoice processor should not be able to approve payments or modify vendor records. This way, the system can enforce SoD and prevent unauthorized or fraudulent activities.
The other options are not as effective as restricting program functionality according to user security profiles.
Restricting access to update programs to accounts payable staff only is a general access control measure, but it does not address the SoD issue within the accounts payable department. Including the creator's user ID as a field in every transaction record created is a useful audit trail feature, but it does not prevent users from performing incompatible functions. Ensuring that audit trails exist for transactions is a detective control that can help identify and investigate any irregularities, but it does not prevent them from occurring in the first place.
CISA-KR 문제 248
The best environment for copying data and transforming it into a compatible data warehouse format is the staging environment. The staging environment is a temporary area where data from various sources are extracted, transformed, and loaded (ETL) before being moved to the data warehouse. The staging environment allows for data cleansing, validation, integration, and standardization without affecting the source or target systems. The testing environment is not suitable for copying data and transforming it into a compatible data warehouse format, as it is used for verifying and validating the functionality and performance of applications or systems. The replication environment is not suitable for copying data and transforming it into a compatible data warehouse format, as it is used for creating identical copies of data or systems for backup or recovery purposes. The development environment is not suitable for copying data and transforming it into a compatible data warehouse format, as it is used for creating or modifying applications or systems. References:
CISA Review Manual, 27th Edition, pages 475-4761
CISA Review Questions, Answers & Explanations Database, Question ID: 2642
CISA-KR 문제 249
Understanding the business process is the most important factor for an effective control self-assessment (CSA) program. A CSA program is a technique that allows managers and work teams directly involved in business units, functions or processes to participate in assessing the organization's risk management and control processes1. A CSA program can help identify risks and potential exposures to achieving strategic business objectives, evaluate the adequacy and effectiveness of controls, and implement remediation plans to address any gaps or weaknesses2. To conduct a successful CSA, it is essential to have a clear and comprehensive understanding of the business process under review, including its objectives, inputs, outputs, activities, resources, dependencies, stakeholders, performance indicators, etc. This will help to identify the relevant risks and controls associated with the process, as well as to evaluate their impact and likelihood. Determining the scope of the assessment, performing detailed test procedures, and evaluating changes to the risk environment are also important factors for an effective CSA program, but not as important as understanding the business process. These factors are more related to the execution and monitoring phases of the CSA program, while understanding the business process is related to the planning and preparation phase. Without a solid understanding of the business process, the scope, testing, and evaluation of the CSA may not be accurate or complete. References: ISACA CISA Review Manual 27th Edition, page 310
CISA-KR 문제 250
The condition that would be of most concern to an IS auditor assessing the risk of a successful brute force attack against encrypted data at rest is short key length. A brute force attack is a method of breaking encryption by trying all possible combinations of keys until finding the correct one. The shorter the key length, the easier it is for an attacker to guess or crack the encryption. Random key generation, use of symmetric encryption, and use of asymmetric encryption are not conditions that would increase the risk of a successful brute force attack. In fact, random key generation can enhance security by preventing predictable patterns in key selection. Symmetric encryption and asymmetric encryption are different types of encryption that have their own advantages and disadvantages, but neither is inherently more vulnerable to brute force attacks than the other. References: CISA Review Manual (Digital Version): Chapter 5 - Information Systems Operations and Business Resilience
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