This case study details how Day & Zimmermann (D&Z), a large U.S. defense and engineering contractor, deployed Cisco Duo to meet strict Department of Defense security requirements for protecting Controlled Unclassified Information. With thousands of employees traveling globally, D&Z required strong multi-factor authentication that worked reliably both online and offline. The study explains how Duo was initially deployed for VPN access and later expanded to protect web applications, remote desktop access, and privileged systems. Offline MFA capabilities ensured regulatory compliance even in low-connectivity environments. The solution improved user experience, reduced deployment complexity, and replaced a costly legacy authentication system while maintaining consistent security controls.

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