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You can use the Cisco Catalyst 4900 Switch, part of the data center switching portfolio, as a top-of-rack access layer switch for rack-optimized servers. Specifically, the Cisco Catalyst 4900M is a top-of-server, two-rack unit Ethernet switch optimized for 10/100/1000 and 10 Gigabit Ethernet access devices.
This switch is unique in the top-of-rack space because it is semifixed. This flexibility provides a cost-effective and modular migration path for Gigabit Ethernet to 10 Gigabit Ethernet. The switch has 8 fixed wire-speed 10 Gigabit Ethernet ports and 2 half-slots, which you can fill with any combination of the following:
