000-221 · Question #162
What speed and duplex attributes should configured on a virtual Ethernet adapter?
The correct answer is C. 10000/Full. Virtual Ethernet adapters on IBM PowerVM must be statically configured to 10000/Full because they operate over an internal virtual switch that has no physical medium to negotiate speed and duplex.
Question
What speed and duplex attributes should configured on a virtual Ethernet adapter?
Options
- A1000/Full
- BAuto/Auto
- C10000/Full
- DDefault/Default
How the community answered
(32 responses)- A6% (2)
- B9% (3)
- C69% (22)
- D16% (5)
Why each option
Virtual Ethernet adapters on IBM PowerVM must be statically configured to 10000/Full because they operate over an internal virtual switch that has no physical medium to negotiate speed and duplex.
Configuring 1000/Full unnecessarily limits the adapter to 1 Gbps and does not reflect the actual capability of the virtual switch fabric.
Auto/Auto relies on physical Ethernet link negotiation, which does not exist for a virtual adapter and would result in an undefined or non-functional configuration.
Virtual Ethernet adapters (VEAs) communicate through the PowerVM internal virtual switch fabric at 10 Gbps full duplex. Since there is no physical cable or hardware link, autonegotiation is not possible and not applicable. Configuring the adapter to 10000/Full aligns with the virtual switch fabric speed and prevents throughput limitations or configuration mismatches.
Default/Default is not a recognized or valid configuration value for speed and duplex settings on a PowerVM virtual Ethernet adapter.
Concept tested: PowerVM virtual Ethernet adapter speed and duplex configuration
Source: https://www.ibm.com/docs/en/powervm/latest?topic=adapters-virtual-ethernet
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