300-610 · Question #306
A network engineer must design a high-performance, lossless Ethernet network to support AI workloads in a data center. The network uses a spine-leaf topology with Cisco Nexus 9000 Series Switches. The
The correct answer is B. Implement PFC only on high-priority traffic.. You don’t want to pause every class - only the AI‑critical queue - so you enable Priority Flow Control on that high‑priority traffic class. ECN on all switches (spine and leaf) then provides proactive, end‑to‑end congestion signaling, ensuring the fabric stays lossless for AI flo
Question
A network engineer must design a high-performance, lossless Ethernet network to support AI workloads in a data center. The network uses a spine-leaf topology with Cisco Nexus 9000 Series Switches. The design must ensure that critical AI traffic can move seamlessly across the fabric without being dropped due to congestion. The design requirements are:
- Prevent packet drops for high-priority AI traffic flows.
- Proactively manage and signal congestion to ensure continuous data
flow even under heavy load. Which design approach must be used to meet these requirements?
Options
- AEnable PFC across all QOS classes.
- BImplement PFC only on high-priority traffic.
- CUse ECN across the network to manage congestion.
- DConfigure PFC on all traffic classes across the spine-leaf topology.
How the community answered
(20 responses)- A5% (1)
- B55% (11)
- C10% (2)
- D30% (6)
Explanation
You don’t want to pause every class - only the AI‑critical queue - so you enable Priority Flow Control on that high‑priority traffic class. ECN on all switches (spine and leaf) then provides proactive, end‑to‑end congestion signaling, ensuring the fabric stays lossless for AI flows without indiscriminately halting other traffic.
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