Most of today's devices are auto-MDI/MDI-X capable and will work with or without a crossover cable. Obviously the cost for such a function these days is minimal and the manual factors have decided to include it without hesitation!
However, I must point that knowing how to create a crossover cable is very important, because not all devices will support auto-mdi/MDI-X. If you wish to view schematics and examples of such configurations, please visit www.firewall.cx/cabling_xover.php.
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