Arista C-Q200-2Q100-3M Compatible 3m (10ft) Ethernet 200GbE QSFP56 to 2X100GbE QSFP56 Passive Copper Hybrid Cable

Yes, the device ports must support Breakout mode.

Typical cable lengths are 0.5m / 1m / 2m / 3m. Going beyond the recommended length can lead to signal distortion, and it is not advisable for deployment. If longer distances are needed, consider using AEC (Active Equalization Copper cable) or AOC (Active Optical Cable) as alternatives.

DAC cables are passive copper cables that do not require external power. They have extremely low power consumption (approximately <0.1W) and can be considered a "zero-power" interconnect solution.