What three options can improve network performance for a virtual machine? (Choose three.)
A.
MLD
B.
TSO
C.
NetFlow
D.
LRO
E.
SR-IOV
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BDE
TSO, LRO and SR-IOV
27
0
B, D and E are correct.
TSO – Use TCP Segmentation Offload (TSO) in VMkernel network adapters and virtual machines to improve the network performance in workloads that have severe latency requirements.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-E105A601-9331-496C-A213-F76EA3863E31.html
LRO – Use LRO in the VMkernel network adapters on an ESXi host to improve the networking performance for incoming infrastructure traffic.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-93DB9BF9-8BCC-4F02-A538-261B669D4D47.html
SR-IOV – Bypassing the VMkernel for networking reduces latency and improves CPU efficiency.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-CC021803-30EA-444D-BCBE-618E0D836B9F.html
9
1
IT professionals may forgo jumbo frames in favor of NICs with large segment offload (LSO) and large receive offload (LRO) capabilities. LSO and LRO allow the CPU to transfer much larger quantities of data to (outbound) or from (inbound) the NIC with far less processing, essentially providing the same CPU performance benefit as jumbo frames.
3
1
https://kb.vmware.com/s/article/2055140
Using TSO (TCP Segmentation Offload) and LRO (Large Receive Offload) on physical and virtual machine NICs improves the performance of ESX/ESXi hosts by reducing the CPU overhead for TCP/IP network operations.
Here is what VMware has on SRV-IO (Single Root I/O Virtualization):
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-CC021803-30EA-444D-BCBE-618E0D836B9F.html
Here are some suggestions for resolving poor network performance:
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.monitoring.doc/GUID-C4EA86FD-95CB-4DE7-A9E3-63F6BFC1A268.html
MLD (Multicast Listener Discovery) is used by IPv6 routers for discovering multicast listeners on a directly attached links.
Netflow is a networking protocol that collects IP traffic information.
So if you eliminate MLD and NetFlow, you are left with TSO, LRO and SRV-IO. SRV-IO eliminates some features from your VM though.
10
0
I think BDE.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-DA8506CE-7813-4B4C-BE14-9B42C36637BA.html
0
0
In vSphere, a virtual machine can use an SR-IOV virtual function for networking. The virtual machine and the physical adapter exchange data directly without using the VMkernel as an intermediary. Bypassing the VMkernel for networking reduces latency and improves CPU efficiency.
1
0
B, D and E are correct.
TSO – Use TCP Segmentation Offload (TSO) in VMkernel network adapters and virtual machines to improve the network performance in workloads that have severe latency requirements.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-E105A601-9331-496C-A213-F76EA3863E31.html
LRO – Use LRO in the VMkernel network adapters on an ESXi host to improve the networking performance for incoming infrastructure traffic.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-93DB9BF9-8BCC-4F02-A538-261B669D4D47.html
SR-IOV – Bypassing the VMkernel for networking reduces latency and improves CPU efficiency.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-CC021803-30EA-444D-BCBE-618E0D836B9F.html
2
0