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Zend_Service_Amazon_Ec2: Regions and Availability Zones

Amazon EC2 provides the ability to place instances in different regions and Availability Zones. Regions are dispersed in separate geographic areas or countries. Availability Zones are located within regions and are engineered to be insulated from failures in other Availability Zones and provide inexpensive low latency network connectivity to other Availability Zones in the same region. By launching instances in separate Availability Zones, you can protect your applications from the failure of a single Availability Zone.

Zend Framework