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All ports auto-sense the network speed of the computers and hubs to run at either 10Mbps or 100Mbps. All ports auto-negotiate between full and half duplex, flow control, and auto MDI/MDIX. Each switch provides an open slot for you to install 2 optional fiber Fast Ethernet ports (DES-102F). These ports can be used to attach 2 servers or cascade switches over the fiber cable.