Exam 3V0-21.21 topic 1 question 77 discussion

B. Implement Multi-NIC vMotion by adding additional vMotion VMkernels. We maintain the 2 x 1 GbE network adapters for vMotion and then configure multiple VMkernel interfaces using the same NIC and network. Each time you add a VMkernel adapter and enable it for vMotion, you create a new stream. With more streams, there is greater bandwidth utilization.

Im going to go with B https://kb.vmware.com/s/article/2007467 https://communities.vmware.com/t5/VMware-vSphere-Discussions/vmotion-load-balanced-across-multiple-uplinks-on-distributed/td-p/491336 https://www.virtuallyboring.com/multi-nic-vmotion/ Even though 2 x network adapters are dedicated to vMotion, only 1 of the uplinks will be used during a vMotion activity if only one vMotion vmkernel is configured. Adding an additional vmkernel will allow both to be used. Per the VMware KB above "After making these configuration changes, when you initiate a vMotion, multiple NIC ports are used. Even when performing a vMotion on just one virtual machine, both links are used." Also the question states "Per the defined logical network configuration, there are two network adapters each" which suggests that changing this to combine vMotion/Mgmt traffic may not be possible based on the customers requirements (as the logical network architecture is already defined by them)

Answer B is correct. By simply implementing multi-NIC vMotion, you will have more bandwith for the live migration of the VMs, and their migration time will be reduced.. A : vMotion automatically tries to use as much bandwith as possible. Setting a reservation won't help, and will degrade the other traffics. In addition, the bandwith is unusable when not doing vMotion operations. C : this help isolate the network, for security reasons. It won't help for performance D : Putting more adapters will not help if multi-NIC vMotion is not implemented.

B. Implement Multi-NIC vMotion by adding additional vMotion VMkernels. https://kb.vmware.com/s/article/2007467

Since there are 2 NICs for vMotion and it doesn't say anything about being shared with other services, Stack or I/O Control will not have any improvements here. So I will say B adding a multi nic vMotion with adicional VMkernels

B would be the correct answer

B. by logical design you have four vswitch with two 1 Gb network adapter each. So best performance acieved with Multi-NIC vMotion. Two IP address on the switch making use of dedicated pnic for each vmkernel port.

I think B should be used as d can choke management traffic and still it won’t use all 4 nics unless multi-nic is applied https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html

Correct Answer : D

"To distribute and allocate more bandwidth to vMotion traffic across several physical NICs, use multiple-NIC vMotion." - B

A-WRONG: There are already 2 network adapters "reserved" for vMotion traffic B-WRONG: Just adding vMotion-enabled vmkernel ports without connecting them to additional NICs will not improve performance: "To distribute and allocate more bandwidth to vMotion traffic across several PHYSICAL NICs, use multiple-NIC vMotion." https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html C-COULD BE if there was no better option (in this case, letter D): https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-5211FD4B-256B-4D9F-B5A2-F697A814BF64.html#GUID-5211FD4B-256B-4D9F-B5A2-F697A814BF64 D-RIGHT (better option): "Direct vMotion traffic to one or more physical NICs that have high-bandwidth capacity and are shared between other types of traffic as well" https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html

I thnik D