Modern applications are built from many components that must communicate reliably and be monitored and managed at scale. If every component calls the next one directly, a slow or failed piece drags down everything upstream; this is called tight coupling. Application integration services loosen that coupling, and management services let a small team watch and operate large fleets. The exam tests whether you can pick the right service for decoupling, notifications, event routing, monitoring, fleet management and device connectivity.
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