What is the purpose of host rebuild reserve in vSAN?
An administrator is enabling vSphere HA and vSAN on the same cluster and needs to use a configuration that is valid for vSphere HA Heartbeat datastore.
Which configuration should be used?
A vSAN administrator is planning to deploy a new vSAN cluster with these requirements:
• Physical adapters share capacity among several traffic types
• Guaranteed bandwidth for vSAN during bandwidth contention
• Enhanced security
Which two actions should be taken to configure the new vSAN cluster to meet these requirements? (Choose two.)
According to VMware's official guide, Network I/O Control (NIOC) should be utilized in order to share the physical adapters' capacity among several traffic types. Additionally, isolating the vSAN traffic in a VLAN will provide enhanced security, as it isolates vSAN traffic from the rest of the network traffic. Enabling jumbo frames and creating static routes between the vSAN hosts will not provide the desired result, as these are not related to the requirements. Utilizing IOPS Limit rules in storage policies is also not related to the requirements, as this is related to storage policies and not network configuration.
About the vSAN Default Storage Policy
VMware vSAN Design Guide | VMware
A vSAN administrator notices that the VMware Skyline Health: Network Latency Check reports indicate that three hosts are noncompliant.
Which action should the vSAN administrator take?
The vSAN administrator should check VMKNICs, uplinks, physical switches, and associated settings. High network latency can be caused by incorrect networking configurations or misconfigured switch settings. By checking the VMKNICs, uplinks, and switches, the vSAN administrator can identify any potential causes of the high network latency and take steps to remedy them.
An all-flash vSAN cluster contains four nodes.
Which two storage policies can the cluster satisfy? (Choose two.)
An all-flash vSAN cluster contains a sufficient number of capacity devices and cache devices to support different RAID levels.
FTT=3(RAID-1 Mirroring) - This policy requires at least 4 capacity devices, where each object is mirrored across three copies of the object. This can be satisfied by the 4 nodes all-flash vSAN cluster.
FTT=1 (RAID-1 Mirroring) - This policy requires at least 2 capacity devices, where each object is mirrored across one copy of the object. This can be satisfied by the 4 nodes all-flash vSAN cluster.
FTT=2 (RAID-6 Erasure Coding) - This policy requires at least 6 capacity devices, where each object is striped across two sets of parity and data. This cannot be satisfied by the 4 nodes all-flash vSAN cluster.
FTT=1 (RAID-5 Erasure Coding) - vSAN does not support RAID-5 Erasure coding.
What are two characteristics of the vSAN Data-At-Rest Encryption (DARE)? (Choose two.)
Two characteristics of the vSAN Data-At-Rest Encryption (DARE) are that it is Software Defined and works independently of the Cache or Capacity drives installed on the Nodes, and it continues to operate unaffected during downtime on vCenter Server. According to VMware's Official Guide, "vSAN Data-At-Rest Encryption (DARE) is a software-defined solution that works independently of the Cache or Capacity drives installed on the Nodes". Additionally, "DARE continues to operate unaffected during downtime on vCenter Server". Thus, these two characteristics make DARE an ideal encryption solution for vSAN.
A vSAN administrator has deployed a new All-Flash vSAN cluster and would like to perform a health test on it to verify that the network performance is meeting the network throughput requirements.
Which tool should be used for this purpose?
According to the VMware vSAN documentation , the vSAN Proactive Test is a built-in feature of vSAN that can be used to test the health of a vSAN cluster and verify that the network performance meets the throughput requirements. This tool can be accessed through the vSAN Health Service. 
A vSAN administrator is looking at adding a new vSAN cluster with hosts that have 512GB memory.
What is the minimum requirement for the node’s flash boot device?
When viewing the VMware Skyline Health: vSAN Object Health report, the vSAN administrator observes that the link “Repair Objects Immediately” is enabled.
What is the meaning of this message?
The Resyncing Objects view in the vCenter UI reports that some objects are currently resyncing.
Which two actions would cause this situation? (Choose two.)
After merging the IT infrastructure of two enterprises, the vSAN administrator was tasked to add one ESXi host with no disks to one of the existing vSAN clusters.
Which two actions should the vSAN administrator take to complete this task? (Choose two.)
To add an ESXi host with no disks to an existing vSAN cluster, the vSAN administrator needs to take the following steps:
It's worth noting that adding a host to an existing vSAN cluster does not require adding a minimum of three ESXi hosts or iSCSI shares, the host can be added without these requirements. Also, having physical NICs with equal network throughput is recommended but not a requirement.
This is explained in VMware vSAN documentation in the section "Adding a Host to a vSAN Cluster" Reference:
An administrator wants to configure a vSAN Direct Configuration for an existing vSAN cluster. The cluster has six hosts with three disk groups each. All disk groups have claimed the maximum amount of disks in the hosts.
Which action should the administrator take first to complete this configuration with the least amount of administrative effort?
This is the most efficient way of configuring a vSAN Direct Configuration on an existing cluster because it does not require the administrator to delete any existing disk groups or add any additional disks. The administrator can use the vSphere Client or vSphere Web Client to view the available disks in the Disk Management tab , and then claim the unused disks from the disk groups to be used for the vSAN Direct Configuration. After all of the disks have been claimed, the administrator can run the vSAN Direct Configuration wizard.
1. Configuring vCenter Server to send alarms when virtual machines ...
VMware vCenter Server 7.0 Update 1 Release Notes
VMWARE TRADEMARK GUIDE
An administrator is preparing maintenance on a host in a vSAN cluster, and the maintenance is expected to take less than one hour. The administrator is considering using the "Full Data Migration" but understands that this can be time consuming and also has additional capacity and performance considerations.
Which action would alleviate these concerns?
According to VMware's documentation, the "No Data Migration" option for maintenance mode should be used when the expected maintenance time is less than one hour. This option will allow the administrator to complete their maintenance without having to wait for a full data migration, which can be time consuming and also has additional capacity and performance considerations. It is important to note that this option will not guarantee the same level of availability as the other options, so it should only be used when the expected maintenance time is less than one hour.
vSAN 2-Node Cluster Guide | VMware
Deploying a vSAN Witness Appliance
vSAN Stretched Cluster Guide | VMware
An administrator has deployed a new vSAN cluster that contains eight hosts and needs to configure a storage policy for the currently deployed database virtual machines. The requirements state that if two hosts in the vSAN cluster fail, all virtual machines are unaffected.
Which RAID configuration must the administrator use in this storage policy to achieve the best performance for the database virtual machines?
The RAID configuration that the administrator must use in this storage policy to achieve the best performance for the database virtual machines is RAID-6.
RAID-6 is an effective configuration for a vSAN cluster with eight hosts as it allows for two hosts to fail and still maintain protection of the data. RAID-6 is a data striping configuration with two parity bits stored across multiple disks, which improves read performance while also providing fault tolerance.
For more information, see the official VMware guide on vSAN Storage Policies:
An enterprise company is carrying out a planned yearly power test on specific platforms, and the infrastructure administrator has been asked to power down a vSAN 7.0 U1 cluster containing production virtual machines. The management workloads, such as the vCenter Server, are running on a different platform.
Which action should the vSAN administrator take to ensure it is safe to complete this task?
The correct action to take to ensure it is safe to power down a vSAN 7.0 U1 cluster containing production virtual machines is to enter Maintenance Mode with the Ensure Accessibility option. This option will migrate the data from the disk groups in the vSAN cluster to other disk groups in the same cluster, and will allow the administrator to power down the cluster without any data loss.
After a server power failure, the administrator noticed the scheduled resyncing in the cluster monitor displays objects to be resynchronized under the pending category.
What are these objects in this category?
A vSAN administrator is receiving complaints that applications are not performing as expected. The vSAN administrator opens the vSAN cluster performance charts to try to identify the issue, but the vSAN cluster performance charts are not available.
Which option should vSAN administrator enable to make these charts available?
An administrator wishes to prevent vCenter notifications of vSAN Health status during a scheduled maintenance window.
Which action can be taken to achieve this goal?
You can silence the vSAN health status alerts from the vCenter HTML client. This will prevent vCenter from sending notifications during the scheduled maintenance window. To silence an alert, you can navigate to the "Monitoring" tab, go to "Alarms" and click on the desired alert to open its settings. From there, you can select "Actions" and then "Silence Alarm". This will prevent notifications for the selected alert until it is cleared or unsilenced.
Please note that this is not a permanent solution and will need to be reapplied after maintenance if desired. Reference:
Which two storage policy types are used with the vSAN Data Persistence platform? (Choose two.)
According to VMware's official guide, the vSAN Data Persistence platform uses two storage policy types: Shared Nothing Architecture and vSAN Direct Configuration. Shared Nothing Architecture is a policy type that enables virtual machines to share a common storage pool and enables applications to scale out across multiple nodes. vSAN Direct Configuration is a policy type that allows applications to be deployed directly on the vSAN datastore and enables them to use the underlying vSAN storage features.
About the vSAN Default Storage Policy
VMware vSAN Design Guide | VMware
A storage administrator is facing degraded performance for the VMs running on a vSAN enabled vSphere Cluster and needs an out-of-the-box tool to identify the root cause of the problem.
Which tool should be used?
vsantop is a command line utility that can be used to monitor the performance of a vSAN cluster in real-time. It provides detailed information about the performance of the vSAN cluster and its components, including disk usage, IOPS, network traffic, and object states. It can be used to identify the root cause of performance problems, such as disk contention, network congestion, or object failures. It provides a quick and easy way to identify the root cause of performance issues, making it a useful tool for troubleshooting vSAN clusters.
This is explained in VMware vSAN documentation in the section "vSAN Tools and Troubleshooting" Reference:
Which two storage policy changes result in a component resync? (Choose two.)
he correct answers are B and E. Changing the failure tolerance method and enabling object checksum (from checksum disabled) both result in a component resync. When the failure tolerance method is changed, the components of the objects stored on the vSAN datastore need to be rebuilt in the new format, which requires a component resync. Similarly, when object checksum is enabled, the components of the objects stored on the vSAN datastore need to be rebuilt in order to enable checksum.
You can find this information in the VMware vSAN 6.7 Documentation, in the section titled 'Storage Policy Rules':
vSAN 2-Node Cluster Guide | VMware
VCP-DCV for vSphere 7.x (Exam 2V0-21.20) Official Cert Guide, 4th ...
vSAN 70u3 Proof of Concept Guide | VMware
A vSAN administrator is deploying a four node vSAN cluster to a new work location. To help with configuration and consistency, the vSAN administrator plans to use Ouickstart
Which two prerequisites must be met prior to taking this action? (Choose two.)
Quickstart is a configuration tool that guides vSAN administrators through the process of creating a vSAN cluster from scratch. It is available in vCenter Server 6.0 U2 and later versions. Therefore, before using Quickstart, it is important to ensure that all hosts are running 6.0 U2 or later. The hosts should not have any existing vSAN or network configurations, to avoid any conflicts with the new vSAN cluster being deployed. This is explained in VMware vSAN 6.7 documentation in the section "Creating a vSAN Cluster using the Quickstart Configuration" Reference: