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This image is a diagram of a basic deployment. The image shows the four tiers of the architecture with the sites external to Oracle Enterprise Manager Ops Center on top. The Enterprise Controller is below the Internet followed by the Proxy Controller, and managed assets. Information flows one way from the external sites to the Enterprise Controller. Information flows both directions between the Enterprise Controller and the Proxy Controller and between the Proxy Controller and the assets. The Enterprise Controller also connects to an optional remote database.