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What is the reason behind that the straight-through cable is applicable to connect two hubs or hub to router?
But according to general rule
straight-through: Unlike components
crossed cable: like components
but how come the two hubs connect with straight-through cable is applicable?
and the two hubs are like component, right?
I think I know what you're asking. Maybe five years ago when hubs were still common, you needed a crossover cable to connect two hubs using any arbitrary port on the hubs. Generally, most hubs of any size (e.g., 8, 16 ports or more) had one port (or an extra port) designated as an "uplink" port where the port itself was "crossed over" so that a straight through cable could be used. You would connect the uplink port from one hub to any of the (non-uplink) ports of the next hub.
Not too long after hubs gave way to switches, switches started commonly using Auto-MDIX ports. That is, the port senses the cable type (straight through or crossover) and reconfigures the transmit and receive on that port accordingly. It was a "feature" of switches for a long time - listed on the specs for the switch. Now, it's so common, I've noticed switches often don't even mention it.