This paper presents the evaluation of a VR learning application to practice routing and network address translation of a home router. The main didactical design feature of the application is the Inside the System approach, which lets the learners become part of the information system by performing the tasks themselves. Accordingly, process knowledge is to be built up and practiced and thus the competence level of Apply according to Krathwohl and Anderson is to be achieved by the learners. For comparability of evaluation results of VR learning apps, we introduced an evaluation design based on usability, VR specific design, and learning performance.