Answer: Configuration management of infrastructure devices is the customer's responsibility., AWS is responsible for protecting the physical cloud infrastructure.

## Explanation In the AWS Shared Responsibility Model: **Correct Answers:** - **A: Configuration management of infrastructure devices is the customer's responsibility.** - This is correct. Customers are responsible for managing the configuration of their AWS resources, security groups, and network access control lists. - **C: AWS is responsible for protecting the physical cloud infrastructure.** - This is correct. AWS is responsible for the security "of" the cloud, including physical infrastructure, hardware, software, networking, and facilities. **Incorrect Answers:** - **B: For Amazon S3, AWS operates the infrastructure layer, the operating systems, and the platforms.** - This is partially true but not a complete aspect of the shared responsibility model. While AWS manages the underlying infrastructure for S3, customers are still responsible for their data security, access controls, and encryption. - **D: AWS is responsible for training the customer's employees on AWS products and services.** - This is incorrect. AWS provides documentation and training resources, but the actual training of employees is the customer's responsibility. - **E: For Amazon EC2, AWS is responsible for maintaining the guest operating system.** - This is incorrect. For EC2 instances, customers are responsible for maintaining the guest operating system, applications, and security patches. **Key Points:** - AWS is responsible for security **OF** the cloud (infrastructure) - Customer is responsible for security **IN** the cloud (data, applications, configurations) - The division of responsibilities varies by AWS service type (IaaS, PaaS, SaaS)

Author: Ritesh Yadav