Use quad small-form factor pluggable plus (QSFP+) direct-attach copper (DAC) cables to connect:- A standalone device to other standalone device (QFX3500, QFX3600, QFX5100)- A QFabric Node device (QFX3500, QFX3600, QFX5100), to a QFabric QFX3000-M Interconnect device (QFX3600-I or QFX5100-24Q).- A leaf device to a spine device in a Virtual Chassis Fabric (VCF).- A master, backup, or line card in a QFX Virtual Chassis.