Correct answer is D: SDN Controller and the management solution
How Do Northbound APIs Work?
Northbound APIs are the link between the applications and the SDN controller. The applications can tell the network what they need (data, storage, bandwidth, and so on) and the network can deliver those resources, or communicate what it has.
D
The management solution is the applications that are supporting and managing control over the network. "The Cloud" could be correct if some of those applications live in the cloud but isn't a complete answer. Applications and SDN Controller should really be an answer here because this is pretty vague and poor.
A should really be incorrect due to virtual switches and routers could live in "the cloud" but be a Southbound API so this is why I would completely remove A as an answer.
Answer is D.
Northbound APIs (SDN northbound APIs) are typically RESTful APIs that are used to communicate between the SDN controller and the services and applications running over the network.
Northbound interfaces define the way the SDN controller should interact with the application plane. Applications and services are things like load-balancers, firewalls, security services and cloud resources. The idea is to abstract the inner-workings of the network, so that application developers can ‘hook’ into the network and make changes to accommodate the needs of the application without having to understand exactly what that means for the network.
https://www.econfigs.com/ccna-7-7-c-northbound-and-southbound-apis/
A
Correct answer is D:
From the official study Guide "Northbound APIs (SDN northbound APIs) are typically RESTful APIs that are used to communicate between the SDN controller and the services and applications running over the network. Such northbound APIs can be used for the orchestration and automation of the network components to align with the needs of different applications via SDN network programmability. In short, northbound APIs are basically the link between the applications and the SDN controller.
"
According to your website the answer should be A. Examples of the types of network applications that can be optimized via the northbound interface include load balancers, firewalls, or other software-defined security services, or orchestration applications across cloud resources.
Answer should be A:
SCOR Reference Book:
Northbound APIs (SDN northbound APIs) are typically RESTful APIs that are used to communicate between the SDN controller and the services and applications running over the network. Such northbound APIs can be used for the orchestration and automation of the network components to align with the needs of different applications via SDN network programmability. In short, northbound APIs are basically the link between the applications and the SDN controller. In modern environments, applications can tell the network devices (physical or virtual) what type of resources they need and, in turn, the SDN solution can provide the necessary resources to the application.
Answer should be D : SDN controller and management solution as cloud is to specific and the management solution can be on prem or a cisco cloud solution.
Your actually stating it in your reference:
In short, northbound APIs are basically the link between the applications and the SDN controller. In modern environments, applications can tell the network devices (physical or virtual) what type of resources they need and, in turn, the SDN solution can provide the necessary resources to the application.
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