NCA-5.15 · Question #94
Refer to the exhibit. An administrator has five VMs running on AHV. After creating a new VM and attaching a NIC to the Network Name as shown in the exhibit, the new VM is not able to ping its…
The correct answer is C. The Network Name s assigned the wrong VLAN ID. In AHV, a Network Name encapsulates a VLAN ID that is applied as an 802.1Q tag to VM traffic; an incorrect VLAN ID causes the new VM's traffic to be dropped by the physical switch before reaching the gateway.
Question
Refer to the exhibit. An administrator has five VMs running on AHV. After creating a new VM and attaching a NIC to the Network Name as shown in the exhibit, the new VM is not able to ping its gateway. The other five VMs are able to successfully communicate with the gateway using the came Network Name. Which statement would explain why the new VM would not be able to ping its gateway?
Options
- AEach VM needs its own Network Name
- BThe IP address on the new VM is in the wrong subnet
- CThe Network Name s assigned the wrong VLAN ID
- DYou can only have five VMs per Network Name
How the community answered
(25 responses)- A4% (1)
- B8% (2)
- C84% (21)
- D4% (1)
Why each option
In AHV, a Network Name encapsulates a VLAN ID that is applied as an 802.1Q tag to VM traffic; an incorrect VLAN ID causes the new VM's traffic to be dropped by the physical switch before reaching the gateway.
AHV does not require each VM to have a unique Network Name; multiple VMs sharing a single Network Name is the intended and supported design for placing VMs on the same network segment.
An incorrect IP subnet on the VM would be a guest OS configuration issue unrelated to the Network Name shown in the exhibit, and the question context points to a Network Name-level problem.
AHV Network Names bind VM virtual NICs to a specific VLAN ID that is stamped onto outgoing frames as an 802.1Q tag. If the VLAN ID configured in the Network Name does not match the VLAN allowed on the upstream physical switch port, the tagged frames from the new VM are discarded in transit and never reach the default gateway. The five existing VMs working on the same Network Name name suggests the exhibit may reveal a misconfigured VLAN ID that was set incorrectly when this particular Network Name configuration was last modified.
There is no five-VM limit per Network Name in AHV; a single Network Name can support an unlimited number of VM virtual NICs concurrently.
Concept tested: AHV Network Name VLAN ID misconfiguration and VM connectivity
Source: https://docs.nutanix.com/en/main/acropolis/topics/ahv-networking-overview.html
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