The answer is C. 4.
In an AI cluster, you typically have four separate “fabrics”:
Scale-Up Fabric
Connects the GPUs within a single node (e.g., NVLink/NVSwitch).
Scale-Out Fabric
Links GPUs across nodes for distributed training (e.g., RoCE or InfiniBand).
Front-End Fabric
Carries storage traffic, application I/O, and in-band cluster management.
Management Network
Handles out-of-band tasks, such as provisioning, health checks, and firmware updates.
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cybe001
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