Which of the following descriptions about the SRIOVI pass-through mode in FusionCompute are correct? (Multiple choice)

Question

Options

• ASRIOV enables network transmission to bypass the software simulation layer and assign it directly
• BThe virtual network card in SRIOVI pass-through mode supports hot addition
• CWhen creating a port group for a distributed virtual switch in SRIOV pass-through mode, you can
• DIf the virtual machine uses the SRIOV pass-through virtual network card, the memory snapshot

• A
  71% (25)
• B
  9% (3)
• C
  20% (7)

Explanation

SR-IOV (Single Root I/O Virtualization) is a hardware-level technique that allows VMs to directly access a physical NIC's virtual functions, bypassing the hypervisor's software network simulation layer entirely - making A correct, as this bypass is SR-IOV's defining characteristic and the primary reason for its performance advantage. D is also correct because SR-IOV pass-through creates a direct hardware binding between the VM and the physical device, which breaks the hypervisor's ability to capture a consistent memory state, meaning memory snapshots are unsupported for VMs using SR-IOV virtual NICs.

B is wrong because SR-IOV pass-through NICs do not support hot addition - the direct hardware assignment requires the VM to be powered off to add or remove such adapters, unlike emulated virtual NICs. C is wrong (even though the option is truncated) because SR-IOV pass-through bypasses the virtual switch entirely; distributed virtual switch port group features that rely on software-layer processing are not applicable in this mode.

Memory tip: Think of SR-IOV as "direct wire" - the VM gets a private wire to the hardware, which means blazing speed (A) but also hardware-level restrictions: no hot-plug (B is out), no virtual switch tricks (C is out), and no snapshots (D is a real limitation).

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