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Difficulty: HardAWS Global Infrastructure

A company manages several AWS accounts within an AWS Organization. A system administrator notices that when deploying EC2 instances in the Availability Zone named 'us-east-1a' in Account A and Account B, the physical data centers hosting these instances might be different.

Which of the following statements explains this behavior and identifies the correct method to reference the same physical infrastructure across both accounts?

  1. A
    AWS automatically assigns the same Availability Zone name to the same physical data center across all accounts. To coordinate resource placement, the company should use the default subnet mappings in each account.
  2. B
    Availability Zone names are based on the geographical coordinates of the IAM user creating the resources. To reference the same physical location, both accounts must create resources from the same physical office location.
  3. AWS maps Availability Zone names (such as 'us-east-1a') independently for each AWS account to ensure resource distribution. To reference the same physical Availability Zone across accounts, the company must use the Availability Zone ID (AZ ID), such as 'use1-az1'.Answer
  4. D
    AWS regions are logically partitioned into virtual environments that prevent physical sharing of hardware. To share the same physical infrastructure, the company must deploy all resources in a single virtual private cloud (VPC) across both accounts.

Answer

AWS maps Availability Zone names (such as 'us-east-1a') independently for each AWS account to ensure resource distribution. To reference the same physical Availability Zone across accounts, the company must use the Availability Zone ID (AZ ID), such as 'use1-az1'.
The correct answer explains that AWS maps Availability Zone names (like 'us-east-1a') independently to physical infrastructure for each AWS account to ensure even resource distribution. To reference the same physical Availability Zone across accounts, the company must use the Availability Zone ID (AZ ID), such as 'use1-az1'.

Step-by-Step Solution

1
Understand why Availability Zone logical names vary.
AWS maps logical names to physical data centers independently for each account to distribute power, cooling, and compute resources evenly.
To prevent resource concentration in a single physical facility (e.g., everyone deploying to 'us-east-1a' and overloading it).
2
Identify the mechanism to consistently reference a physical Availability Zone.
The Availability Zone ID (AZ ID) remains constant across all AWS accounts in an organization.
AZ IDs (like 'use1-az1') uniquely map to the actual physical facility in a Region.
3
Select the option that explains the logical-to-physical mapping difference and recommends using AZ IDs.
The correct option is the one stating that AWS maps names independently and that AZ IDs must be used.
It aligns with AWS Global Infrastructure design principles for multi-account architectures.

Key Concept

AWS Availability Zone Logical Names vs. Physical AZ IDs
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Topics

AWS Global Infrastructure

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