The northbound APIs on an SDN controller enable applications and orchestration systems to program the network and request services from it.
Southbound interfaces are implemented with a Service Abstraction Layer (SAL) Which speak to network devices using SNMP and CLI (Command Line Interface) of the elements that make up the network. The main functions of SAL are:
+ Expose device services and capabilities to apps
+ Determine how to fulfill requested service irrespective of the underlying protocol
Note:
+ An API is a method for one application (program) to exchange data with another application.
+ Interface here refers to the “software interface”, not the physical interfaces.
Likely A and B - page 11 : https://www.cisco.com/c/dam/global/sr_rs/training-events/2016/cisco-day-2016/pdf/APIC-EM_Vedran_Hafner.pdf
Not C, as a more correct statement would be "Northbound APIs are used to define how SDN controllers integrate with applications"
Not D, as a more correct statement would be "Southbound interfaces utilize OpenFlow and OpFlex.."
Not sure about E
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