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How does SR-IOV move data directly to and from the network adapter?
Suggested Answer: C
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Comprehensive and Detailed Explanation (Cisco NFVI / Virtualization Knowledge)
SR-IOV (Single Root I/O Virtualization) allows a VM to access the network interface hardware directly, without going through the hypervisor's virtual switch.
This is achieved by:
Assigning Virtual Functions (VFs) directly to VMs
Allowing high-performance, low-latency packet I/O
Bypassing the hypervisor datapath
Therefore, SR-IOV does not bypass the guest OS; it bypasses the hypervisor I/O virtualization layer, delivering near-native performance.
Thus the correct answer is C.
15 comments · newest first
GE
Geoffrey
1 month ago
D) Using STP VLAN root doesn’t fit here. Not relevant.
EL
Elza
2 months ago
I’m leaning towards B too. Hypervisor adds overhead.
MO
Moira
2 months ago
But B is more direct for data flow. Less latency!
AL
Alex
2 months ago
I feel like C) Bypassing the hypervisor could also be right.
KE
Kenia
2 months ago
Agreed! It improves performance by avoiding extra layers.
CA
Candida
2 months ago
I think it's B) Bypassing the guest operating system. Makes sense!
AD
Adaline
2 months ago
Surprised this isn't more widely known!
AD
Adelle
3 months ago
A) STP PortFast isn't even related here.
JU
Junita
3 months ago
Wait, are you sure it bypasses the guest OS too?
FL
Florencia
3 months ago
Totally agree, that's how it speeds things up.
SE
Serina
3 months ago
B) Bypassing the hypervisor is the key!
CA
Carolynn
3 months ago
I don't think STP is related to SR-IOV at all, so I would rule out those options.
RA
Raymon
3 months ago
I feel like the guest OS is involved somehow, but I can't recall if it gets bypassed or not.
MA
Marica
4 months ago
I remember practicing a question about SR-IOV, and it was definitely about improving performance by bypassing something.
LA
Lavina
4 months ago
I think SR-IOV bypasses the hypervisor, but I'm not entirely sure if that's the right answer.