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Do i need to order network module (C3KX-NM-1G) to stack two 3750X Switch other than stacking cable?
No. The network module, in the -X series, it to allow differ uplink ports.
What you might need to order it a stacking cable of a longer length. From Cisco, stacking cables come in three lengths. Don't know if still true, but it used to be, I believe, that a 3750 would come standard with the shortest stacking cable which is long enough to go between nearby units when physically stacked vertically together. In larger physically stacks, you would often need to order the longer cable to go between top and bottom stack units.
