The Cisco Catalyst 4000 Series integrates nonblocking Layers 2-4 switching with enhanced control, enabling business agility for enterprise and metropolitan Ethernet customers deploying Internet-based applications. As a component of Cisco AVVID (Architecture for Voice, Video and Integrated Data), the Cisco Catalyst 4000 Series extends control from the backbone to the network edge with intelligent network services, including advanced quality of service (QoS), scalable performance, comprehensive security, and simple manageability. The modular architecture, media flexibility, and expandability of the Cisco Catalyst 4000 Series enable a longer deployment life in converged networks, which reduces the overall cost of ownership by minimizing recurring operational expenses and improves return on investment (ROI).The Cisco Catalyst 4006 switch enhances the Cisco commitment to affordable enterprise and branch scalability, providing a cost-effective, flexible network solution that scales to meet today's high-performance needs with investment protection.