A security operations center (SOC) relies on the centralized logging server to collect, store, analyze and correlate security events from various sources such as firewalls, intrusion detection systems, antivirus software, etc. The centralized logging server uses the timestamps of the events to perform the analysis and correlation. If the IT system clocks are not synchronized with the centralized logging server, the SOC will face difficulties in identifying the sequence and causality of the events, which will affect its ability to detect and respond to potential security breaches. Therefore, this presents the greatest challenge to the SOC's awareness of potential security breaches.
Operating systems that are no longer supported by the vendor may pose a security risk, but they can be mitigated by applying compensating controls such as isolation, segmentation, monitoring, etc. The patch management system that does not deploy patches in a timely manner may also increase the vulnerability exposure, but it can be remediated by prioritizing and applying the critical patches as soon as possible. An organization that has a decentralized data center that uses cloud services may face some challenges in ensuring the security and compliance of the cloud environment, but it can leverage the cloud service provider' s security capabilities and tools to enhance the SOC's visibility and control. Therefore, these options are not the greatest challenges to the SOC's awareness of potential security breaches. References = CISM Certified Information Security Manager Study Guide, Chapter 8: Security Operations and Incident Management, page
2691; CISM Foundations: Module 4 Course, Part One: Security Operations and Incident Management2; RSI Security, Common Challenges of SOC Teams3; Infosec Matter, Security Operations Center: Challenges of SOC Teams4

= The PRIMARY objective of performing a post-incident review is to identify the root cause of the incident, which is the underlying factor or condition that enabled the incident to occur. Identifying the root cause helps to prevent or mitigate future incidents, as well as to improve the incident response process. Re-evaluating the impact of incidents, identifying vulnerabilities, and identifying control improvements are secondary objectives of a post-incident review, which are derived from the root cause analysis. References = CISM Review Manual, 16th Edition, page 3061; CISM Review Questions, Answers & Explanations Manual, 10th Edition, page 1512 The primary objective of performing a post-incident review is to identify the root cause of the incident. After an incident has occurred, the post-incident review process involves gathering and analyzing evidence to determine the cause of the incident. This analysis will help to identify both the underlying vulnerability that allowed the incident to occur, as well as any control improvements that should be implemented to prevent similar incidents from occurring in the future. Additionally, the post-incident review process can also be used to re-evaluate the impact of the incident, as well as any potential implications for the organization.

Comprehensive and Detailed Explanation From Exact Extract:
Integrating information security into existing change management processes ensures that security considerations are included in all application changes and deployments. This addresses the root cause of bypassed security reviews and provides a consistent, repeatable process to manage risk going forward.
"Integrating security into change management ensures that changes to systems and applications undergo appropriate security review and testing prior to implementation, thereby addressing vulnerabilities proactively."
- CISM Review Manual 15th Edition, Chapter 3: Information Security Program Development and Management, Section: Change Management*