Exam 3V0-21.21 topic 1 question 56 discussion

B. Use Network I/O Control and ensure appropriate share value is defined for different types of traffic giving priority to the virtual machines traffic "Virtual machine traffic, which cannot be impacted by other types of traffic” "resilient infrastructure" That rules out C as a single adapter per vSwitch is not "resilient". This rules out D as that NIC teaming policy could give preference to any other traffic type. A is ruled out as it doesn't provide any network preference to VM traffic.

Isn't it B?

Answer is B A : segregating traffic in VLANs will not meet the VM traffic priority requirement B : the keyword is network tiering (so Network I/O Control). We may have to use reservations to ensure VMs traffic is not impacted C : with a single adapted in each vSwitch, we have a SPOF, and then not a resilient architecture as requested D : this one will only globally load balance between the physical NICs, and will not prioritize the VM traffic

B. Use Network I/O Control and ensure appropriate share value is defined for different types of traffic, giving priority to the virtual machine traffic:

B will be the correct answer

B for me. I think the key word here is "network tiering". With Network I/O you can create Shares, Reservations and Limits. Is recommended in case you have to share nics between many services, specially vSan https://docs.vmware.com/en/VMware-vSphere/7.0/vsan-network-design-guide/GUID-6B00B437-53A3-4ACD-8CD7-AC9D0CE5BA8E.html

Yes B, https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-031F9637-EE29-4684-8644-7A93B9FD8D7B.html

This question is not clear because we do not know how many physical NICs are available to design a "resilient infrastructure" Example 1: We only have 2 physical NICs - In this case, answer should be B. Create a VDS, enable Network I/O and assign a hight bandwidth reservation to the "Virtual machine traffic" Note: We can reserve no more than 75% of the bandwidth of a physical NIC https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-E1983465-4EEB-4526-ADC8-939159335284.html Example 2: We have 4 physical NICs - The answer should be A https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-B57FBE96-21EA-401C-BAA6-BDE88108E4BB.html

Reading this: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-B57FBE96-21EA-401C-BAA6-BDE88108E4BB.html I think is A (Isolate from one another the networks for host management, vSphere vMotion, vSphere FT, and so on, to improve security and performance.)