(The core of catalyst 3750 series is Cisco stackwise technology, which is an innovative stacking architecture. It provides a 32gbps stacking interconnection, connects up to 9 switches, and integrates them into a unified, logical and optimized device for convergence, so that customers can deploy voice, video and data applications with more confidence. This innovative technology of Cisco can bring the following advantages to customers of stackable switches:? Stackable resiliency through advanced failover capabilities based on hardware and software? Unified service based on distributed forwarding and quality of service (QoS)? Simplify management through automatic configuration? Can the performance meet the requirements of Gigabit Ethernet connection? Can support IPv6)