*Cable termination issues (e.g., improper crimping, loose connectors) can cause connectivity failures. *Power budget (A) applies to PoE devices, not general cabling issues. *Device requirements (B) relate to software/hardware compatibility, not wiring faults. *Port status (C) would help if the issue was switch-related, but since moving devices didn't help, it's likely a cabling issue. #Reference: CompTIA Network+ N10-009 Official Documentation - Cabling & Physical Layer Troubleshooting.