Nutanix NCS-CORE Online Practice Questions and Exam Preparation

Nutanix NCS-CORE Online Questions & Answers

• Question 251:

  A consultant needs to image nodes that cannot be discovered with the Foundation VM

  The nodes are connected to a flat stitch and are already part of a Nutanix cluster.

  What course of action would result in Foundation success?

  A. Use the customer's top of rack switch.
  B. Buy a new flat switch.
  C. Bare metal image the nodes.
  D. Change the physical connections.
  C. Bare metal image the nodes.

  ---

  Explanation/Reference:

  If nodes cannot be discovered using the Foundation VM and they are already part of a Nutanix cluster, the best course of action is to bare metal image the nodes. This process involves re-imaging the nodes from scratch, which can resolve discovery and communication issues that may be caused by existing configurations or errors within the cluster's networking setup.References: Nutanix Bible, Nutanix University NCS-Core 6.8 learning materials

• Question 252:

  A consultant has completed a cluster build according to the following requirements:

  1.

  Syslog Setup with ERROR level Logging

  2.

  Proxy Setup

  3.

  SNMP v3 Trap setup

  When adding the cluster to an existing Prism Central with a proxy setup, the following error is triggered in the Prism Gateway logs:

  Caused by: corn.nutanix.util .base.ValidationException: Prism Central is unreachable

  What configuration is likely missing?

  A. Whitelist of Prism Central OSIP inside of Prism Element and all Prism Element CVMs inside of Prism Central
  B. Whitelist of Prism Central VIP inside of Prism Element and Prism Element VIP inside of Prism Central
  C. Whitelist of AHV Host IP addresses in Prism Central
  D. Whitelist of Prism Central DSIP inside of Prism Element
  B. Whitelist of Prism Central VIP inside of Prism Element and Prism Element VIP inside of Prism Central

  ---

  Explanation/Reference:

  The error stating "Prism Central is unreachable" when trying to add a cluster to an existing Prism Central with a proxy setup is likely due to incorrect or missing network routing configurations or firewall rules that do not allow communication between Prism Element and Prism Central. The most likely configuration that is missing and needed to resolve this issue is the whitelist of Prism Central VIP inside of Prism Element and Prism Element VIP inside of Prism Central. Whitelisting these Virtual IP addresses ensures that network traffic between these crucial components of the Nutanix architecture is permitted, thus enabling successful communication and registration of the cluster with Prism Central.References: Nutanix Network Configuration Guide, Nutanix Prism Central Administration.

• Question 253:

  Which two components are required to validate and Foundation a cluster with ESXi as the hypervisor? (Choose two.)

  A. ISO image for ESXi
  B. iso_whitelist.json
  C. Phoenix Installation Tool
  D. Latest NCC LCM Bundle
  A. ISO image for ESXi
  B. iso_whitelist.json

  ---

  Explanation/Reference:

  To foundation a cluster using ESXi as the hypervisor, the necessary components include:

  ISO image for ESXi: This is required to install ESXi on the nodes within the cluster.

  iso_whitelist.json: This file is crucial for the Foundation process as it lists the supported ISO images and their checksums to ensure the integrity and compatibility of the hypervisor ISO being used.

  References:

  Nutanix Bible (https://www.nutanixbible.com), specifically sections discussing hypervisor installation and compatibility.

  Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), covering Foundation processes and required files.

• Question 254:

  HOTSPOT

  An administrator is configuring an All Flash cluster to support the following workloads:

  Full clone virtual desktops

  Hadoop

  Write heavy databases

  Whichthree correct configuration options should the administrator use to meet the item requirements? (Choose three.)

  For each procedure, indicate whether it is a correct or incorrect procedure that must be configured to meet the item requirements using the drop-down option.

  Hot Area:

  

  

  ---

  Explanation/Reference:

• Question 255:

  An administrator needs to migrate workloads from a Nutanix cluster running VMware ESXi to Nutanix AHV. The migration process needs to be completed in multiple VM groups and support roll back in case any problems are found during user acceptance testing.

  Which action should the administrator perform?

  A. Use Cross Hypervisor DR to replicate VMs from ESXi to AHV
  B. Use VMware Converter
  C. Use Nutanix one-click cluster conversion from ESXi to AHV
  D. Use storage live migration
  C. Use Nutanix one-click cluster conversion from ESXi to AHV

  ---

  Explanation/Reference:

  https://next.nutanix.com/installation-configuration-23/convert-existing-nutanix-vmware-cluster-to-nutanix-only-37600

• Question 256:

  Imaging fails for one or more nodes in the cluster

  

  A log file displays this output:

  Interface ethO has an uplink.

  Downloading livefs files... Connecting to 10.249.230.171:8000 (10.249.230.171:8000) [80.852033] random:

  nonblocking pool is initialized

  tar: short read livecd files not found.

  What is the possible root cause?

  A. IPMI credentials are invalid.
  B. There is a problem connecting to the Foundation VM.
  C. Hypervisor version is not on the whitelist (iso_whitelist. j son).
  D. AOS version is incompatible.
  B. There is a problem connecting to the Foundation VM.

  ---

  Explanation/Reference:

  The log file output indicating a failure in downloading livefs files and problems finding the livecd files during node imaging suggests there is a problem connecting to the Foundation VM. The specific error "tar: short read livecd files not found" typically points to an interrupted or failed download process, which can be caused by connectivity issues between the nodes and the Foundation VM. Ensuring robust network connectivity or verifying network settings in the Foundation VM could resolve this issue.References: Nutanix Foundation Tool Error Messages, Nutanix Troubleshooting Documentation.

• Question 257:

  After the migration, some SQL queries take longer to execute than prior to migration.

  The following SQL best practices were applied while creating the SQL VM on Nutanix:

  1.

  vDisks per SQL server VM

  2.

  Database and Log files on separate vDisk

  3.

  TempDB database drives and 1 TempDB log drive

  What should the administrator to do improve the SQL Server performance?

  A. Redistribute existing data by creating additional database file and enable autogrowth
  B. Create multiple TempDB data files and enable autogrowth
  C. Create multiple SQL log files and disable autogrowth
  D. Redistribute existing data by creating additional database files and disable autogrowth
  B. Create multiple TempDB data files and enable autogrowth

  ---

  Explanation/Reference:

  In the scenario where SQL queries are running slower post-migration, creating multiple TempDB data files is a recognized best practice for optimizing SQL Server performance, especially when dealing with high transaction rates or complex

  queries. This approach helps in distributing the I/O load across multiple files and drives, reducing the contention and wait times associated with TempDB, which is a common bottleneck in SQL Server environments. Enabling autogrowth

  ensures that these files can dynamically grow as needed, which helps in handling unexpected increases in database activity without manual intervention.

  References:

  Nutanix Best Practices for SQL Server, SQL Server performance tuning guidelines.

• Question 258:

  A consultant has been tasked with increasing security on a Nutanix cluster by disabling password authentication when accessing the CVM and AHV hosts and instead moving to key-based SSH.

  What is the easiest way for the consultant to meet these requirements?

  A. Enable STlGs via command line on SSH to a CVM.
  B. Configure LDAP authentication through a secure server.
  C. Enable Cluster Lockdown and provide an RSA key.
  D. Restrict access with User Management in Prism.
  C. Enable Cluster Lockdown and provide an RSA key.

  ---

  Explanation/Reference:

  The most straightforward approach for increasing security by disabling password authentication and moving to key-based SSH on a Nutanix cluster involves:

  Enable Cluster Lockdown and provide an RSA key: Cluster Lockdown mode restricts management access to the cluster, ensuring that only key-based SSH authentication is used to access the CVM and AHV hosts, enhancing security by

  eliminating the use of passwords.

  References:

  Nutanix Bible (https://www.nutanixbible.com), particularly sections discussing secure access and authentication methods.

  Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), where security features like Cluster Lockdown are covered.

• Question 259:

  A consultant will be doing an install for an enterprise customer. The consultant has racked up, powered on, and connected their Foundation software to the new nodes. The Foundation VM is not discovering the hardware.

  What should the consultant do to resolve this issue?

  A. Console to each node, reboot the node, go through BIOS to set an IPMI IP address, then run Foundation bare metal installation using IPMI IP addresses.
  B. Connect a crash cart to each node, log in to the pre-installed AHV hypervisor, run the IPMITool commands to set IPMI IP Address, subnet, and gateway for each node. Run a Foundation using the configured IPMI addresses that were just set.
  C. Collect the IPMI MAC addresses on the back of each node, run a bare metal Foundation using each MAC addresses.
  D. Connect a crash cart to each node, reboot the node, go through BIOS and set an IPMI IP address for each node. Using your Foundation VM, create a Phoenix boot ISO, then mount the ISO via Virtual Media connector from IPMI.
  B. Connect a crash cart to each node, log in to the pre-installed AHV hypervisor, run the IPMITool commands to set IPMI IP Address, subnet, and gateway for each node. Run a Foundation using the configured IPMI addresses that were just set.

  ---

  Explanation/Reference:

  In a Nutanix environment, if the Foundation VM is not discovering the hardware, it could be due to issues with the IPMI (Intelligent Platform Management Interface) settings. IPMI is a set of computer interface specifications for an autonomous

  computer subsystem that provides management and monitoring capabilities independently of the host system's CPU, firmware (BIOS or UEFI), and operating system.

  In this scenario, the consultant should connect a crash cart to each node, log in to the pre-installed AHV hypervisor, and run the IPMITool commands to set the IPMI IP Address, subnet, and gateway for each node. After setting the IPMI

  settings, the consultant should run Foundation using the configured IPMI addresses that were just set.

  This will ensure that the Foundation VM can communicate with the nodes via IPMI and discover the hardware, allowing the installation to proceed.

  References:

  [Nutanix Support and Insights]

  [Nutanix Community]

  [Nutanix Documentation]

  [Nutanix Certified services - core (NCS-Core) 6.8 - Nutanix University]

  [Nutanix Bible]

  [Nutanix Certified services - core (NCS-Core) 6.8 Playlist - YouTube]

• Question 260:

  The networking team makes changes to the Top of Rack switches to which the Nutanix cluster are attached. A few VMs are able to communicate with each other on the same node but are unable to connect to other parts of the network.

  What is the likely cause of this issue?

  A. There is a VLAN misconfiguration on the VMs.
  B. The vNIC port is disconnected on the affected VMs.
  C. There is a VLAN misconfiguration on the switch.
  D. Jumbo Frame are misconfigured across ports.
  C. There is a VLAN misconfiguration on the switch.

  ---

  Explanation/Reference:

  When VMs on the same node can communicate but fail to connect to other parts of the network following changes made to Top of Rack switches, the issue often stems from a VLAN configuration error on the switches. VMs on the same node communicating successfully indicates that the local switch configuration is intact, but inability to reach external network segments points to an incorrect VLAN setup on the broader network, likely introduced during the recent changes to the Top of Rack switches. References : Nutanix Networking Guide, Troubleshooting Network Connectivity in Nutanix.