What is the difference between a normal LAN cable and cross cable? What could be the maximum length of the LAN cable?

The way the paired wires are connected to the connector (RJ45) is different
in cross cable and normal LAN cable.
The theoretical length is 100 meters but after 80 meters you may see drop in speed due to loss of signal.

Read more: http://www.placementpapers.us/networking/848-desktop_engineer_interview_questions.html#ixzz1sTPLCihU
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