Exam 2V0-21.19 topic 1 question 29 discussion

A: The use of a VDS enables traffic shaping (throttling) , B: Addition of an extra NIC in the portgroup allows the Production VMs to use more bandwidth independent of teh Test VMs.

CD are not relevant to the question. But I have no clue why A and B is the correct answer.

A: VDS traffic shaping (throttling) , B: an extra NIC in the port group allows the Production VMs to use more bandwidth

I think the answer is right, A and B, Traffic shapes outbound network traffic on standard switches and inbound and outbound traffic on distributed switches, so that from VDS, will sharping ingress/egress traffic both, then big file transfer in Test Vms not impact Production Vms. adding second NIC will also impact network traffic. as for C and D which not related to network traffic.

Are which the correct answers?

I would go for A & D: A => as stated before, because of traffic shaping. You can avoid (limit) having the Dev-VMs soaking up all the Bandwidth. B => Does not help, if the Dev-VMs are soaking up the Bandwidth. C => Memory is not the Issue here / not impacted by large-file transfers. D => But CPU is: large-file transfers = more cpu cycles. Using Ressource Pools can avoid the Situation of having the Dev-VMs using too much cycles because of the transfers.

As traffic shaping is also valid for outbound traffic on Standard Switches (check https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-D3A091C0-0D0D-480D-ACE3-62524E2E0D0A.html?hWord=N4IghgNiBcIC4CcwDNkEsDGACAzgCzAAc0A7AcxAF8g) , I think that it should be better to Enable the Test VMs to a dedicated folder with CPU shares set to low. Just think in other situations...having production and test environment together, sharing the CPUs, it could be problematic if we don't use shares. So I think the correct answers are B and D.

A and B. I read this as either Windows VMs are accessing a CIFS share over the network or Linux VMs are accessing an NFS share. On the SAN device you can create a separate IP target for the VMs to access the share thus the need to add a second VM nic on the same IP network. You are therefore using the second NIC on the VMs to isolate traffic to a different network and then can use traffic shaping on the VDS as required.

I think this should be B & D. Direct quote from performance best practices "In a native environment, CPU utilization plays a significant role in network throughput. To process higher levels of throughput, more CPU resources are needed." Not sure how using a VDS port group would help here. Any thoughts on this?