Ensuring that appropriate user access controls are in place is crucial to protecting the application's data and functionality from unauthorized access or misuse. This task directly impacts the security and integrity of the application post-implementation. Access controls help ensure that only authorized users can access sensitive data and perform critical functions, which is a key focus area for an IS auditor.
While a business impact analysis (BIA), penetration testing, and identifying project delays are important activities, they may not be as critical in the immediate post-implementation review as verifying that proper user access controls have been implemented. This is essential for maintaining security and ensuring that the system operates as intended in a secure environment.

ROI directly measures the financial benefits realized versus the costs incurred, providing an objective quantification of whether the project delivered the expected value.

This approach helps mitigate the risk of DNS poisoning by preventing attacks like cache poisoning, where oversized or malformed DNS responses can be exploited. By configuring DNS servers to limit the size of responses, the organization can reduce vulnerabilities that may allow attackers to inject false data into DNS caches.
While verifying administrators, ensuring DNS changes are propagated, and providing antivirus tools to end users are all good practices, they do not specifically address the risk of DNS poisoning. Configuring the DNS servers to handle appropriately sized responses directly mitigates the vulnerability that attackers exploit in DNS poisoning attacks.