Exam AWS-SysOps topic 1 question 616 discussion

Ans is C https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-ug.pdf#best-practices

When you organize your AWS resources based on lifecycle and ownership, you might want to build a stack that uses resources that are in another stack. You can hard-code values or use input parameters to pass resource names and IDs. However, these methods can make templates difficult to reuse or can increase the overhead to get a stack running. Instead, use cross-stack references to export resources from a stack so that other stacks can use them. Stacks can use the exported resources by calling them using the Fn::ImportValue function. For example, you might have a network stack that includes a VPC, a security group, and a subnet. You want all public web applications to use these resources. By exporting the resources, you allow all stacks with public web applications to use them Ans is C

By creating a separate CloudFormation template specifically for creating the S3 bucket and exporting it, you establish a central resource that can be referenced by other service-specific templates. This allows different templates to import the S3 bucket and utilize it as a shared resource.

When you organize your AWS resources based on lifecycle and ownership, you might want to build a stack that uses resources that are in another stack. You can hard-code values or use input parameters to pass resource names and IDs. However, these methods can make templates difficult to reuse or can increase the overhead to get a stack running. Instead, use cross-stack references to export resources from a stack so that other stacks can use them. Stacks can use the exported resources by calling them using the Fn::ImportValue function. For example, you might have a network stack that includes a VPC, a security group, and a subnet. You want all public web applications to use these resources. By exporting the resources, you allow all stacks with public web applications to use them

C is the answer Whenever you have a resource that will be used by many stacks, it is best practice to create a template for this resource and export it to be used by other stack templates

answer is C

C. Create the S3 bucket in its own template and export it. Seem correct

A. Include the S3 bucket as a mapping in each template. - Wrong (as bucket info is not changing) B. Add the S3 bucket as a resource in each template. C. Create the S3 bucket in its own template and export it. - Best approach D. Generate the S3 bucket using StackSets. (not Required)

I'll go with C

C. Create the S3 bucket in its own template and export it.

Answer should be C.

As all services are set in a separate template including S3, the right answer is to export it’s templates to other ones, hence answer C should be the correct one.

It should be A - Mapping is a static variable for the template. Why we are not choosing "A"?

it's C B doesn't make any sense, so every stack will create the same bucket?!

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resources-section-structure.html As per that answer is B

I'll choose C

my guess is C