Can one subnet be attached across multiple availability zones?

When discussing the structure of subnets in Amazon Web Services (AWS), it's crucial to understand how availability zones and subnets interact within a Virtual Private Cloud (VPC). A subnet is a range of IP addresses within a VPC, and it is specifically designed to reside within a single availability zone. Each availability zone is a distinct physical location that ensures high availability and fault tolerance.

Subnets must be confined to a single availability zone to maintain resource isolation and to facilitate functionalities such as routing and security. This means that resources deployed in a specific subnet will be located in the same availability zone, enhancing performance and reliability. When a subnet is created, it is tied to an availability zone, thereby establishing a clear relationship between the two, which cannot be altered later.

In the scenario where multiple availability zones are needed, a common practice is to create separate subnets in each zone. This approach allows for the distribution of resources, high availability, and failover capabilities without risking a single point of failure. By placing resources in multiple subnets across different availability zones, organizations can achieve greater resilience and redundancy.

Understanding this fundamental aspect of AWS architectures is essential for deploying scalable and robust applications in the cloud. Thus, a subnet cannot span across multiple availability zones, affirm