Implement and manage virtual networking1 / 5
You need to enable Accelerated Networking on an existing Azure VM to improve network performance. What must you do before enabling it?
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Alex
To enable Accelerated Networking on an existing Azure VM's network interface, you must first deallocate (stop) the VM. Accelerated Networking uses single root I/O virtualization (SR-IOV) to provide significantly improved networking performance by bypassing the host's virtual switch. This feature can only be toggled on an existing VM's NIC when the VM is in a stopped (deallocated) state. According to Microsoft documentation, you must stop/deallocate the VM before you can enable accelerated networking on any existing NIC. Why the option “Deallocate (stop) the VM before enabling Accelerated…” is correct: Azure requires the VM to be in a deallocated state before modifying the accelerated networking setting on its NIC. This is because enabling SR-IOV requires changes to the underlying hardware allocation that cannot be performed while the VM is running. Why the other options are wrong: - the option “Resize the VM to a GPU-enabled size” (Resize the VM to a GPU-enabled size): While accelerated networking does require a supported VM size, it does not specifically require a GPU-enabled size. Many general-purpose and compute-optimized VM sizes support accelerated networking. GPU-enabled sizes are designed for graphics and compute workloads, not a prerequisite for accelerated networking. - the option “Detach all data disks from the VM” (Detach all data disks from the VM): Data disks have no relationship to network interface configuration. Accelerated networking is a NIC-level feature and does not require any changes to disk attachments. - the option “Move the VM to a different subnet” (Move the VM to a different subnet): Subnet placement has no bearing on whether accelerated networking can be enabled. Accelerated networking is a NIC hardware feature, not a networking topology feature. (Source: https://learn.microsoft.com/en-us/azure/virtual-network/accelerated-networking-overview)
Sourcelearn.microsoft.com
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