Modern applications are built and run very differently from a single server in a rack. Infrastructure as code (IaC), serverless functions, microservices and containers let teams deploy quickly and consistently, but each shifts where security risks live. Security+ expects you to understand what each architecture is, what its security advantages are, and what new risks it brings. The theme running through all of them is that automation spreads both good and bad configurations at speed, so securing the templates, images and pipelines matters as much as securing the running systems.
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