You need to connect several existing HPE Cray XD servers to a new HPE Slingshot...

B is correct. HPE Slingshot is Ethernet-based and can interoperate with selected standard Ethernet adapters, so existing 200 GbE NICs do not automatically have to be replaced. The key requirement is that the adapters be on the HPE-qualified support list for the Slingshot switches and intended configuration. Qualification confirms interoperability for link behavior, firmware, drivers, performance, and supported operating modes.

Option A is incorrect because HPE Slingshot is not an InfiniBand fabric and therefore does not require NDR InfiniBand adapters. Option C is too absolute; HPE Slingshot NICs are not the only possible edge adapters where supported Ethernet NICs are qualified. Option D confuses storage networking with host attachment. LNet routers are used to bridge Lustre networking domains or provide routed access in certain HPC storage designs; they are not a general requirement for connecting 200 GbE server NICs to Slingshot top-of-rack switches.

The integrator’s task is therefore to validate the exact adapter, firmware, cable/transceiver, and switch-port combination against HPE support documentation before deployment.

References/topics: Advanced HPE Compute Solutions, Rev. 26.21, Module 10 “HPE HPC networking solutions”; HPE Slingshot QuickSpecs and qualified Ethernet-adapter guidance.