True or false: In AWS, subnets are global resources spread across availability zones.

Subnets in AWS are not global resources; instead, they are regional constructs that reside within specific availability zones. Each subnet is created in a particular VPC, which itself is confined to a single region. This means that when you create a subnet, you must associate it with a specific VPC, and that VPC exists within only one AWS region.

The distinction is important because while availability zones can span different geographic locations within a region, subnets are limited to the scope of that region. Therefore, the statement that subnets are global across availability zones is inaccurate, which makes the assertion that the answer is false correct.

Understanding the architecture of AWS, specifically how resources like VPCs and subnets are organized regionally and not globally, is crucial for effective network design and management in a cloud environment.