"communication between an SDN controller AND applications" -> northbound
-https://www.econfigs.com/ccna-7-7-c-northbound-and-southbound-apis/
-ccna mod 3 13.4.4 Traditional & SDN Architectures
Does this imply that
Netconf & Openflow = Southbound
And would this make "B" the most correct answer?
use nortbound (REST API) in communication between your applications and controller.
use southbound (OpenFlow, OpFlex, RESTCONF, NETCONF) in communication between controller and network devices.
B is correct answer indeed.
REST (Representational State Transfer) APIs provide a simple, stateless communication interface that allows applications to interact with the SDN controller over the network. It is a widely used and flexible approach for integrating SDN controllers with various applications and services.
Did anyone notice the question? It mentions - SDN controller "end" applications, not SDN controller "and" applications. I think it could be a typo. But I'm still confused.
D: OpenFlow specifies the communication between the control plane and the data plane. It implements one of the first standards in SDN enabling the SDN controller to interact directly with the forwarding nodes – switches and routers – in a network.
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