A Trusted Remote Data Trading Scheme in Hybrid SDN for Intelligent Internet of Things

Table 1

Comparison of hybrid SDN networking models.

Networking model	SDN components	Protocol conversion	Communication scope	Scalability & robustness
Networkwide SDN	Controller/switches/nodes	N/A	SDN internal	Impacted by SDN controller performance
SDN middleware	Controller/middleware/nodes	Middleware parsing protocol	At least one SDN device	Restricted by protocol parsing
SDN agent	Controller/legacy switches & agents/nodes	Agent parsing protocol	All nodes limited by agents	Limited by controller loads
Hybrid SDN	Controller/switches/gateways/legacy switches & routers/nodes	VLAN gateway	Networkwide	Dependent on network architecture