7. Core Switch have stack provides excellent resiliency by creating a single “virtual chassis” from two Core Switch physical devices for management the traffic and bandwidth , using dedicated high speed stacking links. Stack provides a highly available system where network resources are spread out across stacked units, reducing the impact should one of the stacked units fail. Switch ports may be aggregated on different units, for excellent high availability. Stacking delivers a resilient solution at a fraction of the cost of a full chassis-based system, and the stack may be managed as a single network node.