The Cisco Catalyst 4900M Switch (Figure 1) is designed for data center network top-of-rack switching & midmarket collapsed core & aggregation layer deployment. Optimized for ultimate deployment flexibility for the data center, the Cisco Catalyst 4900M can be deployed for 10/100/1000 or 1/10GBASE-T server access with 1:1 uplink-to-downlink oversubscription & environments with a mix of 10/100/1000 & 10 Gigabit Ethernet servers or all 10 Gigabit Ethernet servers.