Which option describes an industry-standard API that the ONF defines?
- OpenFlex
- REST
- NETCONF
- OpenFlow
Explanation: OpenFlow is an industry-standard southbound API that is specifically defined by the Open Networking Foundation (ONF). Its primary function is to configure the flow tables in switches, which defines the specific flow path traffic takes through a network.
The other options represent different protocols or architectures:
- NETCONF is a network management protocol standardized by the IETF (Internet Engineering Task Force) used to install, manipulate, and delete device configurations via XML-encoded messages.
- OpFlex (likely the "OpenFlex" mentioned in the query) is an open-standard protocol that utilizes a declarative SDN model, where a controller like the Cisco APIC sends abstract policies to network elements.
- REST (Representational State Transfer) is a web service architecture based on the HTTP request-response model that has not been formally defined by any specific standards body.
Related exam: Modules 23 – 26: Checkpoint Exam: Software-Defined Networking Answers (CCNP ENCOR v9)
