This ebook explains why Zero Trust Network Access is now essential for secure application access as legacy VPNs expose organizations to lateral movement, data breaches, ransomware, third-party risk, and operational inefficiency. It highlights VPN weaknesses such as broad network access, constant patching, centralized traffic routing, poor SaaS and cloud performance, and excessive access for contractors, vendors, BYOD users, and OT/IT operators. The guide presents ZTNA as a modern model that continuously verifies identity, device posture, context, and authorization before granting direct access only to approved applications. It emphasizes reduced attack surface, hidden applications, least-privilege access, lower infrastructure costs, centralized policy management, and user experience.

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