VCP550 · Question #28
A virtual machine is receiving a large number of network packets, which is affecting the performance of other virtual machines connected to the same virtual network. What should the vSphere administra
The correct answer is B. Configure the distributed switch to which the virtual machine is connected for ingress traffic shaping. Excessive inbound network traffic on a VM should be controlled using ingress traffic shaping, which is only available on vSphere Distributed Switches. Configuring this policy limits the packet rate arriving at the offending VM without affecting other VMs.
Question
A virtual machine is receiving a large number of network packets, which is affecting the performance of other virtual machines connected to the same virtual network. What should the vSphere administrator do to resolve the issue?
Options
- AMigrate the virtual machine to a standard switch that has been configured for ingress traffic shaping
- BConfigure the distributed switch to which the virtual machine is connected for ingress traffic shaping
- CMigrate the virtual machine to a different port group on the same distributed switch
- DEnable Network I/O Control on the standard switch to which the virtual machine is connected
How the community answered
(38 responses)- A5% (2)
- B71% (27)
- C8% (3)
- D16% (6)
Why each option
Excessive inbound network traffic on a VM should be controlled using ingress traffic shaping, which is only available on vSphere Distributed Switches. Configuring this policy limits the packet rate arriving at the offending VM without affecting other VMs.
vSphere Standard Switches support only egress traffic shaping - they do not support ingress traffic shaping - making this option technically impossible.
vSphere Distributed Switches support both egress and ingress traffic shaping policies at the port group level, unlike standard switches which only support egress shaping. Configuring an ingress traffic shaping policy restricts the rate and burst size of packets arriving at the virtual machine, preventing it from saturating the shared virtual network and degrading performance for neighboring VMs.
Moving the VM to a different port group on the same distributed switch applies no traffic-limiting policy and does not reduce the inbound packet rate.
Network I/O Control is a feature exclusive to vSphere Distributed Switches and cannot be enabled on a standard switch.
Concept tested: vSphere Distributed Switch ingress traffic shaping policy
Source: https://docs.vmware.com/en/VMware-vSphere/5.5/com.vmware.vsphere.networking.doc/GUID-C99A5383-9E28-4D40-8E03-B74A041D8FE3.html
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