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The correct answer isB. Implementation of robust IAM and network security practices.

Ahybrid cloud environmentinvolves integrating private and public cloud infrastructures. This setup requires enhanced security practices to manage the complexity and diverse security requirements of both environments.

Key Aspects:

Identity and Access Management (IAM):Ensures secure authentication and authorization across both private and public clouds.

Network Security:Includes securing data in transit, implementing network segmentation, and protecting communication between cloud environments.

Unified Security Policies:Establishing consistent policies and access controls across both environments.

Visibility and Monitoring:Continuous monitoring of network traffic and access logs to detect potential threats.

Why Other Options Are Incorrect:

A. Encryption for data at rest:Important but not the most comprehensive security measure for hybrid environments.

C. Software updates and patch management:While essential, these practices alone do not address the complex challenges of a hybrid setup.

D. Multi-factor authentication only:MFA enhances authentication security but does not cover the broader security requirements of a hybrid cloud.

Real-World Context:

Organizations using services likeAWS Direct ConnectorAzure ExpressRouteto integrate on-premises environments with the public cloud must implement robust IAM and network security practices to maintain secure and compliant data flows.

In amulti-cloud environment, organizations must implementcentralized governance, security policies, and monitoringto:

Ensure complianceacross multiple providers (AWS, Azure, Google Cloud, etc.).

Standardize security policiesto avoid inconsistencies and misconfigurations.

Use Cloud Security Posture Management (CSPM) toolsto automate security compliance and misconfiguration detection.

Prevent cloud sprawlby enforcing identity and access policies across multiple providers.

This aligns with:

CCSK v5 - Security Guidance v4.0, Domain 2 (Governance and Risk Management)

CSA’s Cloud Security Alliance (CCM) - Cloud Security Operations Best Practices​.

Acentralized bastion or transit networkimproves hybrid cloud security by:

Reducing cloud sprawlthrough a unified security control point.

Centralizing firewall, logging, and security monitoringfor betterthreat detection and response.

Enforcing consistent security policiesacross different cloud platforms (AWS, Azure, on-premises data centers).

Minimizing unauthorized lateral movementwithin hybrid cloud environments.

This concept is extensively covered in:

CCSK v5 - Security Guidance v4.0, Domain 7 (Infrastructure Security)

Cloud Controls Matrix (CCM) - Network Security and Monitoring​.