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Cisco 300-540 Exam - Topic 1 Question 12 Discussion

How does SR-IOV move data directly to and from the network adapter?
C) Bypassing the hypervisor
A) Using the STP PortFast
B) Bypassing the guest operating system
D) Using the STP VLAN root

Cisco 300-540 Exam - Topic 1 Question 12 Discussion

Actual exam question for Cisco's 300-540 exam
Question #: 12
Topic #: 1
[All 300-540 Questions]

How does SR-IOV move data directly to and from the network adapter?

Show Suggested Answer Hide Answer
Suggested Answer: C

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.


by Charlene at May 27, 2026, 05:34 AM

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Elza
3 days ago
I’m leaning towards B too. Hypervisor adds overhead.
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Moira
8 days ago
But B is more direct for data flow. Less latency!
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Alex
13 days ago
I feel like C) Bypassing the hypervisor could also be right.
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Kenia
19 days ago
Agreed! It improves performance by avoiding extra layers.
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Candida
24 days ago
I think it's B) Bypassing the guest operating system. Makes sense!
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Adaline
29 days ago
Surprised this isn't more widely known!
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Adelle
1 month ago
A) STP PortFast isn't even related here.
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Junita
1 month ago
Wait, are you sure it bypasses the guest OS too?
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Florencia
1 month ago
Totally agree, that's how it speeds things up.
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Serina
2 months ago
B) Bypassing the hypervisor is the key!
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Carolynn
2 months ago
I don't think STP is related to SR-IOV at all, so I would rule out those options.
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Raymon
2 months ago
I feel like the guest OS is involved somehow, but I can't recall if it gets bypassed or not.
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Marica
2 months ago
I remember practicing a question about SR-IOV, and it was definitely about improving performance by bypassing something.
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Lavina
2 months ago
I think SR-IOV bypasses the hypervisor, but I'm not entirely sure if that's the right answer.
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