In a deployment where Cisco cannot decrypt customer data, which approach is used?

• A. Hybrid Data Security
• B. End-to-end Encryption
• C. Private Key Encapsulation
• D. Secure Cloud Isolation

Answer: (A)

This question is about keeping customer data confidential when the service provider (Cisco in this case) cannot decrypt the data itself. The best approach is Hybrid Data Security, which centers on encryption with customer-controlled keys and data security controls that allow the service to operate without ever having access to plaintext. In this model, the data remains encrypted end-to-end, and keys stay under the customer’s control, so Cisco can enforce policies, protect data, and provide security analytics without being able to read the actual content. This setup is ideal for scenarios requiring strong privacy guarantees and compliance, because trust boundaries are clearly defined and data cannot be decrypted by the provider.

Other options don’t fit as precisely. End-to-end encryption describes encryption from source to destination, but it doesn’t inherently specify how key management and processing are handled across a hybrid cloud where the provider must operate on data without decrypting it. Private key encapsulation is a cryptographic technique, not a deployment model for protecting data in a cloud service. Secure Cloud Isolation focuses on isolating workloads rather than ensuring that data remains inaccessible to the service provider through customer-managed keys and related controls.