Cisco Updated 300-610 Exam Questions and Answers by ryker

The two requirements map independently to the two Ethernet Adapter Policy controls. Cisco documents that when TCP Large Receive Offload is disabled, the CPU processes the large packets. When it is enabled, adapter hardware reassembles segmented TCP packets before sending them to the CPU, reducing CPU work and potentially increasing inbound throughput. Because the question explicitly requires the CPU to perform that processing, TCP Large Receive Offload must be disabled. Receive Side Scaling serves a different purpose. RSS distributes network receive processing across multiple CPUs or cores in a multiprocessor system instead of assigning all receive work to a single processor. Cisco’s VIC tuning guidance explains that RSS spreads traffic across receive queues and permits different queues to be processed by different CPU cores, improving throughput and preventing one processor from becoming the receive bottleneck. Therefore, RSS must be enabled to satisfy the second requirement. Option A incorrectly offloads large-packet reassembly to hardware. Option B leaves receive processing concentrated on one processor. Option C both offloads the large packets and disables the required CPU distribution. Only Option D preserves CPU processing of large TCP packets while enabling multi-processor receive scaling. Queue counts, completion queues, interrupt settings, and MSI-X mode must also be sized correctly in an implementation, but those parameters do not change the required enabled/disabled states asked for here. Cisco UCS Manager Ethernet Adapter Policy fields

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