Nutanix NCS-CORE Online Practice Questions and Exam Preparation

Nutanix NCS-CORE Online Questions & Answers

• Question 141:

  A consultant is setting up a new install of Nutanix Files for a customer, but receives this error when attempting to join the customer's Active Directory domain:

  File Server could not join the Domain because User credentials failed with error Unable to connect to WORKGROUP ads_connect: No logon servers

  The consultant has already verified the domain credentials provided by the customer are valid and have the correct permissions.

  What is the most likely cause in this scenario for a domain-join failure when setting up Nutanix Files?

  A. The FSVMs storage network must be in the same network as the logon servers.
  B. The client network is failing to communicate with the customer's domain controllers due to mismatched MTU sizes.
  C. The client network is failing to communicate with the customer's domain controllers due to a missing network firewall port requirement.
  D. The FSVMs must first be manually added to a site mapping in Active Directory before they can be authorized to communicate with the logon servers.
  C. The client network is failing to communicate with the customer's domain controllers due to a missing network firewall port requirement.

  ---

  Explanation/Reference:

  The most likely cause for the failure in joining the Active Directory domain when setting up Nutanix Files, given the error message about the inability to connect to logon servers and valid credentials, points to network communication issues. The specific mention of "ads_connect: No logon servers" suggests that the File Server VMs (FSVMs) are unable to reach the domain controllers. This issue is often due to necessary network firewall ports not being open. Ensuring that all required ports for Active Directory communications are open between the FSVMs and the domain controllers would resolve this issue.References: Nutanix Files Administration Guide, Active Directory Services Network Configuration requirements.

• Question 142:

  An existing Nutanix customer has several clusters in production and is adding a new cluster. The customer wants to create an AHV cluster that has already been racked and powered on remotely, with the factory image, using Prism Central.

  Which step should the consultant take next?

  A. Build the cluster with the Foundation Applet
  B. Build the cluster with the Foundation VM.
  C. Bare metal image the nodes with the Foundation VM.
  D. Build the cluster with Foundation Central.
  D. Build the cluster with Foundation Central.

  ---

  Explanation/Reference:

  For adding a new cluster to an existing set of production clusters using AHV and wanting to manage the setup remotely via Prism Central, the most appropriate and efficient method is to use Foundation Central. Foundation Central allows for the remote deployment and configuration of Nutanix clusters through Prism Central, facilitating the foundation process without needing physical access or separate foundational utilities like the Foundation VM or Applet. It uses the factory image on the nodes and is designed to streamline cluster expansions and deployments in enterprise environments. References : Nutanix Foundation Central User Guide, Nutanix Prism Central documentation.

• Question 143:

  An administrator needs to forecast infrastructure requirements for a new program and its associated applications. Prior to the projected start of the new program, all existing applications will be decommissioned.

  How should the administrator perform this task?

  A. Check the Disregard Existing Workloads radio button in the Runway scenario.
  B. Check the Disregard Existing Nodes radio button in the Runway scenario.
  C. Add up the recovered workloads and manually remove from the Runway configuration.
  D. Power down the workloads during a maintenance window and run the Capacity Runway.
  A. Check the Disregard Existing Workloads radio button in the Runway scenario.

  ---

  Explanation/Reference:

  When forecasting infrastructure requirements for a new program in a Nutanix environment where all existing applications will be decommissioned, the most straightforward method is to disregard any workload calculations that include existing applications. This ensures that the analysis focuses solely on the needs of the new program.

  Option A, "Check the Disregard Existing Workloads radio button in the Runway scenario," is the correct choice. Nutanix Runway is a tool designed to help administrators forecast and plan infrastructure requirements based on upcoming needs without being skewed by current utilizations that are scheduled to be decommissioned.

  This method allows for a cleaner, more accurate projection of resources needed for the new applications, disregarding any resources currently in use that will no longer be relevant.

  References:This approach is detailed in Nutanix planning and forecasting documentation, ensuring administrators can plan accurately for infrastructure changes and needs without the interference of outgoing workloads.

• Question 144:

  A consultant discovers that while the Foundation VM and the consultant's laptop are able to ping each other nodes are rea discovered while trying to run Foundation on the customer's network.

  What should the consultant do to resolve the issue?

  A. Connect to same switch as the cluster and ping.
  B. Install Java on the Foundation VM.
  C. Enable IPv6 and multicast on the switch.
  D. Enable IPv6 and multicast on the laptop.
  C. Enable IPv6 and multicast on the switch.

  ---

  Explanation/Reference:

  When Foundation VM and a laptop can ping each other but nodes are not being discovered, it suggests a network protocol issue. The consultant should enable IPv6 and multicast on the switch. Multicast is required for node discovery in many

  environments, especially when using Nutanix Foundation, as it helps in the detection and communication between nodes and the Foundation VM.

  References:

  Nutanix University - NCS-Core 6.8 Learning Path

  The Nutanix Bible, Foundation chapter (https://www.nutanixbible.com/)

• Question 145:

  Refer to the exhibit.

  

  

  

  

  An administrator is commissioning a Nutanix Enterprise Cloud. Once the user VMs have been deployed and are running, the administrator finds that VMs on the same host are able to communicate, but are unable to communicate between hosts.

  What must be changed to enable full inter-VM communications?

  A. Change the network the VMs are connected to
  B. Change the spanning-tree port type on the switch
  C. The VMs need to have static IP addresses
  D. Update the switch to specifically allow VLAN 15
  D. Update the switch to specifically allow VLAN 15

  ---

  Explanation/Reference:

  Ref: https://hyperhci.com/2019/11/09/nutanix-ahv-enable-vlan-trunk-mode-on-guest-vm/

• Question 146:

  A consultant is completing final network failover testing on a recently deployed AHV cluster. The cluster consists of the following:

  1.

  Three nodes

  2.

  Two uplinks connected to two switches

  3.

  Supported SFPs

  The consultant removed one SFP+ out of each node. Two of the nodes (Hostl I Host2) failed over to the backup NIC correctly without any interruption but have lost communication with the third node (Host 3) hypervisor/CVM. Inserting the original SFP+ back into the problematic node allowed the network to be connected and the two healthy nodes could communicate successfully again. manage_ovs showjnterfaces output manage_ovs showjinterfaces output: name mode link speed cthO 10000 True 10000 ethl 10000 False None eth2 10000 True 10000 eth3 10000 False None manage_ovs show.uplinks output: Bridge: brO Bond: brO-up bond_mode: active-backup interfaces: ethl ethO lacp: off lacp-fa I 1 back: false lacp_speed: slow What should the consultant validate first?

  A. Validate NIC card on node is seated properly.
  B. Validate that the correct interfaces are included in the bridge.
  C. Validate the customer has configured all their switch ports identically.
  D. Validate the SFP+ is fully plugged into the node and switch.
  D. Validate the SFP+ is fully plugged into the node and switch.

  ---

  Explanation/Reference:

  Given the symptoms where two nodes correctly failover but lose communication with the third node after an SFP+ is removed, the first action should be to:

  Validate the SFP+ is fully plugged into the node and switch: This is critical because a loose or partially connected SFP+ can cause intermittent network issues, which seems to be the problem based on the scenario described.

  References:

  Nutanix Bible (https://www.nutanixbible.com), particularly the network troubleshooting sections.

  Nutanix Field Installation Guide, which provides detailed steps on how to ensure hardware components like SFPs are correctly installed.

• Question 147:

  A consultant creates a Windows VM after installing a new Nutanix cluster running AHV. The consultant has statically assigned an IP address to the VM but it is unable to communicate on the network. Which action should the consultant take to resolve this issue?

  A. Confirm that IPv6 is enabled on the guest VM.
  B. Confirm that the VM vNIC is tied to the correct VLAN in Prism Element.
  C. Mount and install the Nutanix Guest Tools.
  D. Set a Group Policy to make sure the Windows Firewall is disabled.
  B. Confirm that the VM vNIC is tied to the correct VLAN in Prism Element.

  ---

  Explanation/Reference:

  When a VM is unable to communicate on the network despite having an IP address assigned, one common issue is incorrect network configuration in terms of VLAN assignment. In the Nutanix AHV, VLANs are configured and managed within Prism Element. The consultant should verify that the virtual NIC (vNIC) of the VM is correctly configured to the intended VLAN that corresponds with the rest of the network. This ensures that the VM can communicate with other devices on the same network segment. References: Nutanix Bible Nutanix University NCS-Core Materials

• Question 148:

  Refer to the exhibit.

  

  A Microsoft SQL 2016 deployment is shown in the exhibit. The administrator receives user reports that database queries take too long to return.

  Which optimization should be made to this configuration to improve performance?

  A. Combine both of the OS and SQL Binaries disks
  B. Add a second SCSI controller for the Database.
  C. TempDB, and Logs disk Separate the Database. TempDB, and Logs onto their own disks
  D. Configure the VM to use a PCI disk controller
  C. TempDB, and Logs disk Separate the Database. TempDB, and Logs onto their own disks

• Question 149:

  Which subnet is reserved for CVM internal switch traffic?

  A. 192.168.5.0/24
  B. 192.168.254.0/24
  C. 10.100.5.0/30
  D. 172.16.19.0/16
  B. 192.168.254.0/24

  ---

  Explanation/Reference:

  The subnet 192.168.254.0/24 is commonly reserved for CVM (Controller Virtual Machine) internal switch traffic within Nutanix environments. This subnet is used internally by the CVMs for management and storage operations that are integral

  to the Nutanix infrastructure. Using a separate, reserved subnet helps to isolate management traffic from general network traffic, enhancing security and performance.

  References:

  Nutanix University - NCS-Core 6.8 Learning Path

  The Nutanix Bible, Network Configuration chapter (https://www.nutanixbible.com/)

• Question 150:

  A customer has Metro Availability configured in Automatic Resume Mode between Site A and Site B What happens to VMs if Primary Site A has full network failure?

  A. Automatic protection domain promotion in Site B. VMs automatically restart in Site B
  B. VMs continue to run on Site A following an automatic disable of protection domains.
  C. An administrator must unwitness in Site B and promote protection domains in Site B for VMs to restart
  D. An administrator must promote protection domains in Site B for VMs to restart.
  A. Automatic protection domain promotion in Site B. VMs automatically restart in Site B

  ---

  Explanation/Reference:

  https://support-portal.nutanix.com/page/documents/details/?targetId=Web-Console-Guide-Prism-v55:sto-metro-availability-witness-c.html