What does it mean saying the speed of a switch port (or router port)? In other word, does this mean that switch ports have a default-factory speed limit in some sense?
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Switch ports normally can pass traffic at 10Mbps, 100Mbps or 1000Mbps. The default is for the switch port to auto-configure its speed based on signaling between the port and the connected device.
Sometimes auto-speed doesn't work that well and then, if possible, one could manually set the speed of a port (routers, too) with the "speed" or "set speed" command.
The vast majority of switches do not support speeds over 1000Mbps, there are very high-end (think major ISP or large datacenter equipment) switches that can to 10GbPS or 40GbPS now, too.