Information and communication technologies have transformed traditional teaching methods, creating new opportunities to enhance the educational experience. Virtual Learning Environments (VLEs) are particularly valuable for teaching technical standards such as T568-A and T568-B, which are fundamental for structured cabling in local area networks. This paper presents CrossNetVR, a virtual learning environment developed using Unreal Engine 5 for teaching structured cabling standards. The system integrates high-fidelity three-dimensional models with interactive capabilities and gamification elements to create an immersive learning experience. Using a prototype-based methodology through four iterative cycles, we rigorously evaluated the system with 60 participants. Results demonstrate that CrossNetVR significantly enhances learning outcomes, with participants showing an average knowledge gain of 37.5% points between pre-test and post-test assessments and an 82.3% retention rate after four weeks. The virtual environment achieved excellent usability with a System Usability Scale score of 81.7, substantially outperforming benchmark systems. Statistical analysis revealed strong correlations between perceived realism and knowledge acquisition (r=0.52, p=.003), and between user confidence and task completion rate (r=0.65, p<.001). These findings provide empirical evidence for the effectiveness of immersive virtual environments in technical education and establish a replicable framework for developing similar educational technologies in other domains.