ISC2 Certified Cloud Security Professional (CCSP) Practice Question
A cloud service provider tells you that its virtual network fabric is built on software-defined networking (SDN). When a tenant changes a security policy in the self-service portal, the fabric immediately updates flow tables on the underlying virtual switches to enforce the new rules and keep tenant traffic isolated at layer 3. Which SDN plane performs the function of translating the tenant's intent into flow rules and pushing them to the switches?
In an SDN architecture, functionality is split into three logical planes.
The data plane (sometimes called the infrastructure layer) simply forwards packets according to rules it receives; it does not generate or modify those rules.
The control plane, implemented by one or more centralized SDN controllers, is responsible for converting high-level policy into specific flow entries and distributing them to each virtual or physical switch.
The application or management plane provides the user interface or orchestration portal but does not interact directly with individual switches.
Therefore, the component that translates tenant policy and programs the switches is the control plane.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Platform & Infrastructure Security
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