Nutanix NCS-CORE Online Practice Questions and Exam Preparation

Nutanix NCS-CORE Online Questions & Answers

• Question 111:

  An administrator needs to install prism central for their 2550 multi-cluster environment.

  How should they deploy the application?

  A. Deploy a large 3-VM Prism Central instance
  B. Deploy a large 1-VM Prism Central instance.
  C. Deploy a small 3-VM Prism Central instance.
  D. Deploy a small 1-VM Prism Central instance.
  A. Deploy a large 3-VM Prism Central instance

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  Explanation/Reference:

  For managing a multi-cluster environment with a total of 2550 VMs, deploying a large 3-VM Prism Central instance is advisable. This setup provides the necessary scalability, redundancy, and performance to efficiently manage such a large number of VMs across multiple clusters. A 3-VM configuration ensures high availability and fault tolerance, crucial for maintaining consistent operations and management across the clusters.

  References: Nutanix Bible: Prism Central Deployment Nutanix University: Scaling and Managing Large Environments

• Question 112:

  An administrator is currently using both 10g uplink with LACP and balance-tcp. A single VM should not be allowed to use more than a single 10G uplink, and both uplinks should be utilized.

  Which two command should be used to configure the bond? (choose two)

  A. Ovs-vsctl set port br0-up bond_mode=balance-slb
  B. Ovs-vsctl set port br0-up bond_mode=balance-tcp
  C. Ovs-vsctl set port br0-up bond_mode=active-backup
  D. Ovs-vsctl set port br0-up other_config: bond-rebalance-interval=30000
  A. Ovs-vsctl set port br0-up bond_mode=balance-slb
  D. Ovs-vsctl set port br0-up other_config: bond-rebalance-interval=30000

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  Explanation/Reference:

  For a configuration where a single VM should not exceed the bandwidth of a single 10G uplink and both uplinks need to be utilized, the correct bonding mode is balance-slb (Source Load Balancing). This mode allows both uplinks to be utilized while ensuring that a single VM will not exceed the capacity of one uplink, as traffic from each VM or "source" is assigned to one of the links in the bond. The other_config:

  bond-rebalance-interval=30000 command is used to set the interval at which the bonding driver will rebalance the assignment of sources to links in the bond. This helps in maintaining optimal distribution of load across the links as network conditions change.

  References: Nutanix Bible: Network Configuration Nutanix University: Advanced Network Configuration

• Question 113:

  Over the period of 2 to 3 weeks, a cluster displays the following:

  1.

  Periods where Warning Alerts of memory usage over 75% are asserted

  2.

  Periods where Critical Warnings of memory usage over 90% are asserted

  3.

  Periods of slow of frozen VDI desktops have caused work stoppage or slowdown

  4.

  VDI clones have periodically not powered up when called, causing work stoppage

  Which steps should be used to prioritize the administrator's troubleshooting efforts?

  A. Assess resource health on Hardware page Review the Analysis page for memory usage demand Determine the VDI workload-to-host affinity across the cluster
  B. Analyze Alert Pages for a root cause of memory problem Analyze VM table page to access the VM functionality Analyze the VDI Clone properties for possible VDI Workload stress
  C. Check Analysis page for CPU demand Verify VDI workload property for memory subscription Review the Hardware page to determine if the cluster has sufficient RAM
  D. Review Analysis Page for memory use pattern Alert with VDI workload demand Analyze current and future workload in the Capacity Runaway tab for sufficient resources
  D. Review Analysis Page for memory use pattern Alert with VDI workload demand Analyze current and future workload in the Capacity Runaway tab for sufficient resources

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  Explanation/Reference:

  For the scenario with memory usage warnings and VDI performance issues, the best approach is to analyze and understand the memory usage patterns and demands on the system. Option D focuses on reviewing the Analysis page to monitor memory use trends and patterns, which is crucial for identifying peak usage times or processes consuming excessive memory. The mention of alerting with VDI workload demand implies the need to monitor and possibly adjust the VDI workload to better fit within available resources. Finally, analyzing current and future workload in the Capacity Runaway tab helps in understanding if the cluster resources are sufficient for the demand, which is critical in planning for capacity management and ensuring that such issues are mitigated moving forward.References: Nutanix Prism User Guide, Nutanix Community resources, VDI performance troubleshooting practices.

• Question 114:

  A consultant notes that a customer environment requires Nutanix storage containers to be mounted on non-Nutanix hosts for manual data migration workflows.

  What configuration should the consultant validate to ensure setup was performed properly?

  A. Prism Element ?Settings - Filesystem Whitelist
  B. Prism Element - Settings - Cluster Details
  C. Prism Central - Settings - Cluster Details
  D. Prism Central - Settings - Filesystem Whitelist
  A. Prism Element ?Settings - Filesystem Whitelist

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  Explanation/Reference:

  For ensuring that Nutanix storage containers can be mounted on non-Nutanix hosts for data migration workflows, the consultant should validate the configuration under: A. Prism Element - Settings - Filesystem Whitelist. This setting allows specific non-Nutanix hosts to access the Nutanix storage containers, which is essential for environments where data must be accessible to systems outside the Nutanix cluster. By whitelisting the IP addresses or hostnames of these external systems, they are granted the necessary permissions to mount and interact with the Nutanix file systems.References: Nutanix Prism Element User Guide, Nutanix Storage and Filesystem Configuration Best Practices.

• Question 115:

  A customer recently bought services from their consultant to re-configure an existing Cluster for a new use case. The data on the cluster is not important. The customer does not know the CVM usernames and passwords.

  Which Foundation tool should the consultant use to resolve this issue?

  A. Foundation VM - Auto Discovery
  B. Foundation Applet(CVM) - Auto Discovery
  C. Foundation VM - Bare Metal
  D. Foundation Applet(CVM) - Bare Metal
  C. Foundation VM - Bare Metal

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  Explanation/Reference:

  For re-configuring an existing cluster for a new use case where data preservation is not a concern, and there is a lack of CVM credentials:

  Foundation VM - Bare Metal: This tool allows for a complete re-installation of the Nutanix software from scratch, which is ideal in scenarios where existing configurations and data are no longer needed, and access credentials are unknown or

  lost.

  References:

  Nutanix Bible (https://www.nutanixbible.com), especially sections on cluster reconfiguration and Foundation tools.

  Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), where cluster deployment and reconfiguration scenarios are extensively covered.

• Question 116:

  A consultant configures an ESXi cluster which will utilize a vSphere Distributed Switch (vDS). The consultant has just migrated the first host to the dvSwitch when several alerts appear within Prism Element regarding Host-to-CVM connectivity.

  What is causing these alerts?

  A. The consultant migrated the CVM Backplane and VM network adapter over to the vDS.
  B. The consultant migrated the CVM svm-iscsi-pg network adapter over to the vDS.
  C. The consultant migrated the CVM Backplane network adapter over to the vDS.
  D. VLAN tags are incorrectly configured on the vDS port groups.
  A. The consultant migrated the CVM Backplane and VM network adapter over to the vDS.

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  Explanation/Reference:

  When migrating an ESXi host to a vSphere Distributed Switch (vDS), it's crucial to correctly configure network adapters, including those for the Controller Virtual Machine (CVM). If the consultant migrated both the CVM backplane and the VM network adapter to the vDS, this could disrupt host-to-CVM connectivity if not configured correctly on the vDS. Such a setup requires precise configuration of network settings and VLAN tags to maintain seamless connectivity and avoid communication alerts in Prism Element.

• Question 117:

  A consultant is reimaging a Nutanix cluster with a supported ISO, but Foundation returns an error that the media is not a supported ISO.

  Which two actions should the consultant take to resolve this issue? (Choose two.)

  A. Restart the imaging process in Foundation.
  B. Obtain the MD5 checksum of the ISO and confirm the MD5 checksum of ISO is listed.
  C. Edit the whitelist file in Foundation.
  D. Download and replace with the latest iso whitelist. json from the Support Portal.
  B. Obtain the MD5 checksum of the ISO and confirm the MD5 checksum of ISO is listed.
  D. Download and replace with the latest iso whitelist. json from the Support Portal.

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  Explanation/Reference:

  When Foundation reports an error indicating the ISO is not supported:

  Option B: Checking the MD5 checksum of the ISO file ensures that it matches the expected value listed by Nutanix, confirming the file's integrity and compatibility. Option D: Downloading and updating the iso whitelist.json from the Nutanix

  Support Portal ensures that Foundation has the latest information on supported ISO files, potentially resolving compatibility issues.

  References:

  Nutanix Bible (https://www.nutanixbible.com), especially sections on Foundation and ISO troubleshooting.

  Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), which covers the setup and troubleshooting of Foundation.

• Question 118:

  A customer already has a Prism Central (PC) instance deployed in their environment and expects the consultant to unregister the old cluster before registering the new cluster What steps should the consultant take to safely and successfully unregister the customer's former cluster from PC?

  A. Login to any CVM using SSH and use the multicluster command found within NCLi, followed by the unregistration_cleanup.py script on PE and PC.
  B. Login to the PC Web UI, locate the PE cluster and click Unregister from the Actions dropdown menu.
  C. Login to any PCVM using SSH and run the PE_unreglster.py script located in the Nutanix scripts directory, followed by the unregistratlon_cleanup.py script
  D. Login to the PC Web Ul, navigate to Cluster Registrations found under settings in the Admin Center, check the box next to the desired PE. and click Remove
  D. Login to the PC Web Ul, navigate to Cluster Registrations found under settings in the Admin Center, check the box next to the desired PE. and click Remove

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  Explanation/Reference:

  To safely and successfully unregister the customer's former cluster from Prism Central (PC), the consultant should take the following steps as outlined in option D Login to the Prism Central Web UI, which provides a user-friendly interface for

  managing multiple clusters.

  Navigate to the "Cluster Registrations" section found under the "Settings" in the "Admin Center" of the Prism Central interface.

  Check the box next to the desired Prism Element (PE) cluster that needs to be unregistered.

  Click the "Remove" button to unregister the cluster.

  This method allows the consultant to cleanly and directly manage the cluster registration without needing to interact with command-line tools or scripts, making it a straightforward process that minimizes the risk of errors and ensures that the

  operation can be tracked and audited through the UI.

  References: Nutanix Prism Central Guide, Nutanix Administration Documentation.

• Question 119:

  Refer to the exhibits.

  An administrator has reported that a new VM is not performing well.

  

  

  After analyzing the information presented in the exhibits, which option shows the best conclusion regarding this workload?

  A. VM is CPU constrained since the hypervisor cannot provide the required resources.
  B. VM is CPU constrained because more CPU needs to be added to the VM.
  C. VM is Storage constrained, because the workload is waiting for storage access.
  D. VM is not CPU constrained, because the VM is not running, a multithreaded application.
  D. VM is not CPU constrained, because the VM is not running, a multithreaded application.

• Question 120:

  An administrator is notified that a bare metal database server is down. This database server is being served storage using a Nutanix Volume Group. Upon investigating, the administrator finds that the disks in the database server that map to the vDisks in the volume group have gone offline.

  What is causing this issue?

  A. The Volume Group Load Balancer has been disabled.
  B. Port 9443 is blocked in the server firewall.
  C. Port 3260 has been blocked in the server firewall.
  D. A CVM serving the Volume Group has gone offline.
  D. A CVM serving the Volume Group has gone offline.