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The giveaway is the port name Gi1/0/50. An SFP+ DAC generally requires an SFP+ (10G) port. There are very few SFP ports (1G) that accept SFP+ modules. There are no SFP DACs, so you could use either a simple twisted-pair port (1000BASE-T), or SFP with multi-mode fiber (1000BASE-SX), or single-mode fiber (1000BASE-LX). If you do require 10G you'll need a 10G ...

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