The banking industry continues to be vulnerable to network security breaches caused by the red team (network sniffers or hackers) due to the adoption of the star network topology. A robust Virtual Local Area Network (VLAN) can help reduce the menace caused by the red team. In this paper, a robust VLAN was developed using VLAN technology for commercial banks. The implementation was simulated using packer tracer 7.0; a cisco network simulation tool. Prototype development methodology was adopted. The performance indicators used to measure the effectiveness of proposed network are; security, flexibility, network performance, network cost and network management. The proposed VLAN network successfully overcame the bottlenecks posed by the existing network platform. To improve security, flexibility, to reduce the network cost, to improve the network management, network performance, and the network scalability of computer networks, it is very important to employ an effective and efficient computer network method such as the one (Robust VLAN) used in this project. The result from the research showed that the proposed system has a 0% loss at TTL of 127 with average speed within the range of 6-19m/s which gives a good network performance. Therefore, banking industries, and financial organizations in Nigeria should implement this robust Vlan for Quality of Service (QoS) and as well for efficient computer Network.