350-401 Practice Question: Which two statements about NFV performance…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  SR-IOV allows a virtual function (VF) to be directly assigned to a VM, providing near-native network performance.

  Why this is correct

  Correct because SR-IOV enables direct assignment of PCIe functions to VMs, bypassing the hypervisor virtual switch and reducing latency.

• ✗

  NUMA awareness is the primary technique to improve NFV packet processing performance.

  Why it's wrong here

  Incorrect while NUMA awareness is important for memory locality, it is not the primary technique; SR-IOV and DPDK are more directly focused on packet processing acceleration.

• ✓

  DPDK provides a set of libraries and drivers for fast packet processing in user space, bypassing the kernel network stack.

  Why this is correct

  Correct because DPDK allows applications to process packets directly from the NIC in user space, significantly improving throughput and reducing latency.

• ✗

  Using a virtual switch with multiple bonded uplinks eliminates the need for any performance optimization.

  Why it's wrong here

  Incorrect because bonding uplinks provides redundancy and load balancing but does not eliminate the overhead of the virtual switch; performance optimizations are still required.

• ✗

  NFV performance is inherently lower than physical appliances and cannot be improved.

  Why it's wrong here

  Incorrect because NFV performance can be optimized using techniques like SR-IOV, DPDK, and CPU pinning to approach or even match physical appliance performance in many scenarios.