D-Link DGS-3100-48 48-Port Managed L2 Gigabit Stackable Switch The DGS-3100-48 includes two built-in stacking ports that can provide up to 20Gbps in stacking backplane. D-Link switches support 802.1x authentication, which is a secure implementation that allows users to log onto your network. The D-Link DGS-3100-48, which supports 802.1p Quality of Service (Qos) with 4 queues. Traps can be set on abnormal events and information can be polled to maximize the productivity of the network.