This guide explains why Zero Trust is essential for mainframe security, emphasizing a strategy of never assuming trust, enforcing least privilege, and continuously validating access. Page 2 highlights rising breach costs and the need to protect critical workloads. Page 3 outlines key enablers like role-based and identity access management, MFA, segmentation, and continuous audit readiness. Page 4 uses a vault analogy to illustrate modern defenses such as safeguarded copies and resilient data protection. Together, these practices create a proactive, resilient security posture for mainframe environments.

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