Types of SDN applications when considering security issues
When considering security, definitions of the types of applications are further refined from the definitions given in Internal applications and External applications:
| internal application | The SDN application runs inside an OSGI container in same operating environment as the controller |
| local external application | The SDN application runs on the same system as the controller and communicates with the controller via REST APIs. |
| remote external application | The SDN application runs on a different system (in single and Distributed Coordination modes) from the controller and communicates with the controller via REST APIs. |
| remote clustered external application | The SDN application is a remote external application that runs on an external cluster of servers, but the application is presented as a single instance to a controller. |