Consolidated Billing for Cost Optimization and VPC Resource Utilization Insights

Answer - A and C.

Each organization in AWS Organizations has a master account that pays the charges of all the member accounts.

If you have access to the master account, you can see a combined view of the AWS charges incurred by the member accounts.

https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/consolidated-billing.html

We can have multiple VPC's serving various departments, and we can use tags to define them and have one billing account.

The tags associated with the VPC's will distinguish each department or environment.

Option A is CORRECT because VPC helps you segregate and organize your resources as per the functionality or domain, thus enabling the account owner to get insight into the resources' costing within the logical grouping of the resources.

e.g., If an organization has a separate VPC for each department - Finance, Development, Sales etc.

It will be convenient to get the billing details per department.

Option B is incorrect because if all the resources are created under a single account, it will be difficult for the accounts manager to get insights into the utilization of resources as per the domains or functionality.

e.g., Instead of having a separate department such as Finance, Development, Sales, etc., if an organization has a single account, it will be tedious to get the details on the billing of each departmental resource.

Option C is CORRECT as having a linked account would enable the accounts manager to leverage the Consolidated Billing for multiple AWS accounts.

With Consolidated Billing, you can see a combined view of AWS charges incurred by all accounts, as well as get a cost report for each account associated with your payer account.

Option D is INCORRECT because only IAM User access will not be sufficient for Consolidated Billing.

For more information on consolidated billing, please refer to the below link-

http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/consolidated-billing.html

You can also have the option of segregating the resources via multiple VPC's and have the billing estimates done via each VPC.For more information on AWS VPC, please refer to the below link-

https://aws.amazon.com/vpc/

Consolidated billing is a feature of AWS that allows a single AWS account, known as the payer account, to consolidate billing information across multiple AWS accounts, known as linked accounts. This means that charges for all AWS accounts within the organization are grouped together on a single bill, making it easier to track and manage costs.

Option A, using multiple VPCs for different departments and tagging resources, would not satisfy the requirement for consolidated billing. While it may be useful for tracking costs within each department, it does not consolidate billing information across multiple accounts.

Option B, using one payer account with no linked accounts, is also not a suitable solution. This setup would not allow for consolidation of billing information, as there would be only one account in use.

Option C, using one payer account with many linked accounts, is the correct answer. This setup allows for the consolidation of billing information across multiple linked accounts, making it easier to track costs and manage expenses. Each linked account is still responsible for paying its own charges, but the payer account is responsible for paying the consolidated bill.

Option D, IAM user access to the Billing and Cost Management console, is not a solution for consolidated billing. While it may allow users to view billing information, it does not consolidate billing information across multiple accounts.

In summary, the correct answer is option C: Use one Payer Account and many linked accounts. This setup allows for consolidated billing and provides insights into each of the VPC environments regarding the utilization of the corresponding VPC resources.