Answer should be D. The question is "WHICH LIMITATION" . The limitation is :by default with multi queue disabled each nic has one queue only handled by one CPU. Enabling multi-queue means a NIC can have x queues handled by x CPUs.
By default, each network interface has one traffic queue that is handled by one CPU at a time. Because the SND (Secure Network distributer, the SecureXL and CoreXL dispatcher) runs on the CPUs handling the traffic queues, you cannot use more CPUs for acceleration than the number of interfaces handling traffic.
Multi-queue lets you configure more than one traffic queue for each network interface. This means more than one CPU can be used for acceleration.
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