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Which northbound API for external applications do developers use to communicate with the HP VAN SDN Controller?
Correct Answer: D
Explanation/Reference: PLUMgrid's proprietary controller is designed to maintain control of its network virtualization solution and is not targeted at controlling external elements today. Like other network virtualization-focused controllers, it provides RESTful APIs in the form of proprietary northbound interfaces. Reference: SDN Controller Wars 2.0 - ON.LAB & Juniper Re-Ignite the Open-Source Battleground. Part 1 of 2 http://www.sdncentral.com/market/controller-onlab-juniper-open-source-sdn-battleground-part1/2013/12/