An administrator needs to deploy a network application that will provide custom analytics by retrieving data from the SDN controller. Which communication direction should the application use to interact with the controller?
Data plane
Southbound
Northbound
East-west
In software-defined networking (SDN), 'northbound' communication refers to the interaction between the SDN controller and the applications or services above it. Applications use northbound APIs to communicate with the controller, allowing them to retrieve data and send instructions for network management and analytics. 'Southbound' communication is used by the controller to interact with the network devices below it, such as switches and routers. 'East-west' communication typically refers to interactions between controllers or devices at the same layer, which is not relevant in this context. The 'data plane' handles the actual forwarding of packets and does not facilitate communication between applications and the controller.
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