Question: what is the difference between cat6 and cat6 shielded?
Answer: Shielded Cat5 and Cat6 cables are augmented with a thin foil that serves to block EMI. ... High-quality shielded Ethernet cable includes a drain wire to provide grounding that cancels the effects of EMI. However, the cable will only be grounded if jacks and couplers used in the installation are also shielded.