Exam AZ-301 topic 6 question 46 discussion

FSV2 machines are hyperthreading enabled and thus, you would need a machine with 4 or more vCPU to support SR-IOV (verified on azure portal Standard_F2s_v2 machine doesn't allow to enable Accelerated networking while Standard_F4s_v2 does allow) As Standard_F2s_v2 machines allow a max of 2 NIC (D answer is not valid), NIC teaming is not supported in Azure and RDMA over Infiniband has nothing to do with increase general network performance, it seems there is not correct answer available.

https://docs.microsoft.com/en-us/azure/site-recovery/azure-vm-disaster-recovery-with-accelerated-networking

Standard F2s_v2 SUPPORTS SINGLE NIC ACC NETWORK

C. Enable SR-IOV

C is correct answer.

There must be an error in this question... RDMA over InfiniBand is only supported on HCP series, and SR-IOV is not supported on Standard F2s_v2. Teaming wil increase cpu/ memory ratio.

Answer is correct following Azure Docs, but specifically to F2s_v2 there is a thread explaining that Accelerated Networking can't be enabled on that specific sizehttps://github.com/MicrosoftDocs/azure-docs/issues/29620 Looking at the table probably F4s_v2 can use Acceleration with 2 NICs https://docs.microsoft.com/en-us/azure/virtual-machines/fsv2-series

Accelerated networking enables single root I/O virtualization (SR-IOV) to a VM, greatly improving its networking performance. This high-performance path bypasses the host from the datapath, reducing latency, jitter, and CPU utilization, for use with the most demanding network workloads on supported VM types. Reference: https://docs.microsoft.com/en-us/azure/virtual-network/create-vm-accelerated-networking-cli

In network in VM show "The selected VM size does not support accelerated networking"

Wrong. The VM size F2s_v2 is not supported. I tested in my lab. supported VM series include D/DSv2, D/DSv3, E/ESv3, F/FS, FSv2, and Ms/Mms.

Enable RDMA is correct, as F2sV2 supports InfiniBand connectivity, RDMA, is a technology that provides a low-latency network connection between processing running on two servers, or virtual machines in Azure.

why not B? in my understanding, RDMA is one method to keep the resource for CPU/Memory, but improve network performance.

C is the right answer https://docs.microsoft.com/en-us/azure/site-recovery/azure-vm-disaster-recovery-with-accelerated-networking

Supported VM instances Accelerated Networking is supported on most general purpose and compute-optimized instance sizes with 2 or more vCPUs. These supported series are: D/DSv2 and F/Fs On instances that support hyperthreading, Accelerated Networking is supported on VM instances with 4 or more vCPUs. Supported series are: D/Dsv3, E/Esv3, Fsv2, Lsv2, Ms/Mms and Ms/Mmsv2.

But if I try in portal with a Standard F2s_v2 I get a "The selected VM size does not support accelerated networking".

Answer is correct see https://docs.microsoft.com/en-us/azure/virtual-network/create-vm-accelerated-networking-cli

Not teaming ?!