How to build Lossless Network for RDMA?

NVIDIA/Mellanox MCP4Y10-N00A Compatible DAC 0.5m (1.6ft) Twin-port 2x400Gb/s OSFP Finned Top to 2x400Gb/s OSFP Finned Top InfiniBand NDR Passive Copper Cable

NVIDIA/Mellanox MMA4Z00-NS Broadcom DSP & Broadcom VCSEL Compatible 800G 2xSR4/SR8 OSFP PAM4 850nm 50m DOM Two MPO-12/APC InfiniBand NDR Transceiver Module for MMF (Finned Top)

NVIDIA/Mellanox MMA4Z00-NS400 Broadcom DSP & Broadcom VCSEL Compatible 400G SR4 OSFP PAM4 850nm 50m DOM Single MPO-12/APC InfiniBand NDR Transceiver Module for MMF (Flat Top)

NVIDIA/Mellanox MFA7U10-H003 Compatible AOC 3m (10ft) 400Gb/s OSFP to 2x200Gb/s QSFP56 InfiniBand HDR Active Optical Splitter Cable (Finned Top, 850nm, MMF, LSZH)

NVIDIA/Mellanox MCP7Y00-N001 Compatible DAC 1m (3ft) Twin-port 2x400Gb/s OSFP Finned Top to 2x400Gb/s OSFP Flat Top InfiniBand NDR Passive Copper Splitter Cable

NVIDIA/Mellanox MCP7Y50-N001 Compatible DAC 1m (3ft) Twin-port 2x400G OSFP Finned Top to 4x200Gb/s OSFP Flat Top InfiniBand NDR Passive Copper Splitter Cable