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The primary reason to regularly update business continuity and disaster recovery documents is to ensure that the plans and procedures are aligned with the current business needs and objectives, and that they can effectively support the availability of business operations in the event of a disaster. Updating the documents also helps to enforce security policy requirements, maintain business asset inventories, and ensure audit and compliance requirements are met, but these are secondary benefits.

References = CISM Review Manual, 16th Edition eBook1, Chapter 9: Business Continuity and Disaster Recovery, Section: Business Continuity Planning, Subsection: Business Continuity Plan Maintenance, Page 378.

 The main reason for having senior management review and approve an information security strategic plan is to ensure that the plan aligns with the corporate governance of the organization. Corporate governance is the set of responsibilities and practices exercised by the board and executive management to provide strategic direction, ensure objectives are achieved, manage risks appropriately and verify that the organization’s resources are used responsibly1. An information security strategic plan is a document that defines the vision, mission, goals, objectives, scope and approach for the information security program of the organization2. The plan should be aligned with the organization’s business strategy, risk appetite, culture, values and objectives3. By reviewing and approving the plan, senior management demonstrates their commitment and support for the information security program, ensures its alignment with the corporate governance, and provides the necessary resources and authority for its implementation4. References = 1: CISM Review Manual 15th Edition, ISACA, 2017, page 172: CISM Review Manual 15th Edition, ISACA, 2017, page 253: CISM Review Manual 15th Edition, ISACA, 2017, page 264: CISM Review Manual 15th Edition, ISACA, 2017, page 27.

Senior management review and approval of an information security strategic plan is important to ensure that the plan is aligned with the organization's overall corporate governance objectives. It is also important to ensure that the plan takes into account any legal and regulatory requirements, as well as the resources and staff needed to properly implement the plan.

Network segmentation is the most effective control to prevent lateral movement. In ransomware attacks, attackers often breach one endpoint and move laterally across the network to reach critical assets.

Segmentation limits this movement by isolating systems into different zones or subnets, thereby reducing the attack surface and preventing unauthorized internal traversal.

DLP and encryption are primarily focused on data protection, not internal network movement.

IDS can detect intrusions but does not prevent movement like segmentation does.

“Network segmentation limits the scope of access for compromised systems and is a key strategy in preventing lateral movement in an attack.”

— CISM Review Manual 15th Edition, Chapter 3: Information Security Architecture, Section: Network Security*

Real-world example: “In the NotPetya and WannaCry incidents, poor internal segmentation allowed malware to propagate rapidly.”