Nutanix NCS-Core Practice Test - Questions Answers, Page 27

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

C . 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.

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.

To execute the command manage_ovs --bridge_name br0 show_uplinks in a Nutanix cluster, the appropriate prompt is:

A . nutanix@CVM-$: This command is intended for execution within the Controller Virtual Machine (CVM) environment, and 'nutanix@CVM-$' is the standard user prompt in the CVM where such network commands are run.

Nutanix Bible (https://www.nutanixbible.com), especially sections on managing virtual bridges and networking commands.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), which includes details on command-line operations within the CVM.

When facing an error during the installation process that the IPMI IP address is unreachable:

C . Check the service.log and the individual node log files for more detailed information: Reviewing these log files will provide insights into what might be causing the IPMI connectivity issue, offering specific error messages or network configuration problems that need resolution.

Nutanix Bible (https://www.nutanixbible.com), where troubleshooting and log analysis are discussed.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), focusing on Foundation troubleshooting and the use of log files to diagnose installation issues.

If after performing a failover operation the virtual machines have no network access despite the network administrator confirming the correct subnets at both sites, the likely issue is:

A . Network mappings are not configured for the Remote Site: This configuration oversight means that although the VMs are online, they do not have appropriate network settings that correspond to the network environment at the failover site, resulting in connectivity issues.

Nutanix Bible (https://www.nutanixbible.com), specifically the sections on disaster recovery and network configurations in failover scenarios.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), covering Data Protection and failover operations.

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.

Reference: Nutanix Network Configuration Guide, Nutanix Prism Central Administration.

To satisfy the customer's request for additional performance and resiliency tests on a cluster, deploying Nutanix X-Ray is the best option. X-Ray is a performance testing and benchmarking tool specifically designed for hyper-converged infrastructures and provides a range of tests that simulate real-world scenarios, stress tests, and resiliency tests. This tool allows the consultant to comprehensively assess the performance, fault tolerance, and operational resilience of the Nutanix cluster, meeting the customer's testing requirements effectively.

Reference: Nutanix X-Ray Documentation, Nutanix Performance Testing Best Practices.

When a task to place an ESXi host into maintenance mode is stuck and the CVM (Controller Virtual Machine) is not shutting down automatically, the consultant should manually shut down the CVM. The commandshutdown -h nowis used to halt the system safely. Before executing this command, it is important to ensure that all virtual machines hosted on the CVM have been properly shut down or migrated to avoid any data loss or corruption.

Nutanix Community: CVM maintenance and Host maintenance1

Nutanix Support & Insights documentation on Cluster Management Commands2

Nutanix Support & Insights on AHV Host Maintenance Mode3

When preparing the laptop and Foundation networking for the installation on customer-indicated HPE/OEM hardware, the consultant should set IP addresses in both the CVM/Host and IPMI subnets (Option C) This ensures that all necessary network interfaces are appropriately configured for management and operational traffic, facilitating seamless communication during the foundation process. Properly setting up IP addresses in both subnets is crucial for ensuring that the Foundation process can access both the CVMs/Hosts and the IPMI for management tasks.

Reference: Nutanix Foundation Guide, Network Preparation for Nutanix Installations.

For expanding a Nutanix cluster with software-less Dell PowerEdge servers, the consultant should:

A. Image nodes using Foundation VM/App. This tool is designed for initial imaging and configuration of Nutanix nodes, including software installation, which is necessary since the nodes arrived without any software. B. Use the Expand cluster functionality within the existing Nutanix environment once the nodes are imaged. This feature will integrate the newly imaged nodes into the existing cluster, enhancing the cluster's capacity and performance. Options C and D are not applicable as returning nodes to the factory for imaging is unnecessary with the availability of the Foundation tool, and 'Expand cluster to image the nodes' is not a correct procedure as imaging must be completed before expansion.

Reference: Nutanix Foundation Tool Documentation, Nutanix Cluster Expansion Guide.