VTP, Portfast, Spanning Tree and all the other switch related stuff.
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A dual-purpose uplink is a combination of one 10/100/1000-TX copper port and one SFP-based Gigabit Ethernet port. One of these two ports can be used at a time. This added uplink flexibility allows cost-effective use of high-density, fiber-uplink-based stacks. Dual-purpose uplinks also offer a full-duplex, gigabit-speed trunk for a Cisco Catalyst 2960 Series Switch stack.