Exam NS0-162 topic 1 question 35 discussion

I would say A and C https://docs.netapp.com/us-en/ontap-select/reference_plan_ots_two_node.html When a cluster consists of two nodes, it is not possible to achieve the quorum required when a node fails or loses communication. To resolve these types of split-brain situations, every instance of the ONTAP Select Deploy utility includes a mediator service. If you have one or more active two-node clusters, the ONTAP Select Deploy virtual machine administering the clusters must be running at all times.

B&C. You use the ONTAP Select Deploy to install the nodes on the physical hardware and the ONTAP Select Deploy VM has the mediator built in of which resides at a third location other than the two data centers

When a cluster consists of two nodes, it is not possible to achieve the quorum required when a node fails or loses communication. To resolve these types of split-brain situations, every instance of the ONTAP Select Deploy utility includes a mediator service https://docs.netapp.com/us-en/ontap-select/reference_plan_ots_two_node.html B is definitely wrong, nodes can't be installed on the physical hardware.

The scenario is for an ONTAP Select MetroCluster SDS deployment. https://docs.netapp.com/us-en/ontap-select/reference_plan_ots_mcc_sds.html https://docs.netapp.com/us-en/ontap-select/concept_usecase_mc_sds.html Not A, "As with all two-node ONTAP Select clusters, there is a separate mediator service contained in the Deploy virtual machine that monitors the nodes and assists in managing failures." Not D, SnapMirror licensing isn't needed for an ONTAP Select MetroCluster SDS deployment.

A & D. Use ONTAP Mediator service to ensure that there is a quorum between the two nodes. Install the SnapMirror Sync license on the cluster to enable synchronous replication of data between the two nodes. How can the mediator service check for quorum if quorum is not possible? Well, he Mediator service in an ONTAP cluster can check for quorum even if quorum is not possible through the use of a witness node. A witness node is a third-party storage device that acts as an independent and neutral third party that can provide a vote to help determine quorum.

Select to be installed on hypervisor not on HW, so B is wrong

How can the mediator service check for quorum if quorum is not possible? I would consider A a trick answer. mediator is required to properly identify the active node during a failover and avoid any split-brain scenario in which both nodes remain independently active during a network partition, but it is does not check for quorum as quorum is not possible.