To achieve high availability, a company should deploy their application across multiple Availability Zones. Each Availability Zone operates independently of the others and is engineered to be insulated from failures in other Availability Zones, thus providing redundancy and failover capabilities for the application. Deploying an application in a single data center or solely relying on autoscaling without distributing across multiple Availability Zones does not necessarily equate to high availability, as these strategies do not protect against issues that might affect a single physical location.
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AWS Cloud Practitioner CLF-C02
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