Nutanix NCS-Core Practice Test - Questions Answers, Page 21

The optimal sequence for deploying a Nutanix AHV cluster with built-in software encryption involves the following steps:

Create Cluster: Establish the cluster foundation, which sets up the basic network and cluster configurations.

Install License Key: The ultimate licensing must be applied before enabling encryption because the feature depends on this license.

Encrypt Cluster: Once the cluster is created and licensed, enable encryption to secure the data at rest. This step should be done before creating storage containers to ensure that all data written to the containers is encrypted from the outset.

Create Storage Containers: Finally, create the storage containers. With encryption already enabled, any data written to these containers will be automatically encrypted.

Nutanix Bible (https://www.nutanixbible.com), specifically the sections on licensing and data encryption.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), covering deployment and configuration best practices.

To manually create a cluster after the nodes have been successfully imaged but the automated cluster creation fails, the correct command to use is:

cluster create -s IP_CVM_A, IP_CVM_B, IP_CVM_n

This command specifies the -s option to include the IP addresses of the Controller Virtual Machines (CVMs) on the nodes, initiating the manual cluster creation process.

Nutanix Bible (https://www.nutanixbible.com), particularly the sections on manual cluster operations.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), with detailed instructions on manual cluster commands.

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.

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.

According to Nutanix best practices for network configuration, it is recommended to use either:

10G uplinks only: This provides sufficient bandwidth for typical data center operations.

25G uplinks only: This option is suitable for higher bandwidth requirements. Mixing uplinks with different speeds, such as 10G and 25G, is not recommended as it can lead to non-optimal performance and complexity in handling traffic.

Nutanix Bible (https://www.nutanixbible.com), specifically sections discussing network interface configurations.

Nutanix Network Administration Guide, which details best practices for network setup.

To increase the Redundancy Factor (RF) from 2 to 3, at least five nodes are required for the cluster to function correctly with RF3, as each data block needs to be replicated to three different nodes. However, the optimal solution that offers both the necessary node count and sufficient storage overhead is:

Six Compute Nodes with 25% available disk space: This configuration ensures that there are enough nodes to support RF3 while maintaining adequate storage capacity for redundancy without overutilization.

Nutanix Bible (https://www.nutanixbible.com), particularly the sections on redundancy factors and node requirements.

Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), focusing on cluster scaling and redundancy considerations.

The most efficient and safest way to implement the customer's desire to reserve storage capacity for future node failures after expanding their existing 7-node RF2 cluster with four additional nodes is to first expand the cluster with the additional nodes, and then enable the Reserve Rebuild Capacity setting. This approach allows the cluster to immediately benefit from increased storage and other resources provided by the additional nodes, which can then be partially reserved to handle potential future failures. This method ensures both an increase in total capacity and the preservation of operational integrity during node failures.

Reference: Nutanix Prism User Guide, Nutanix Best Practices for Cluster Expansion.

To verify that a Nutanix cluster can tolerate a single-node failure, the consultant should use the command nutanix@cvm~$ ncli cluster get-domain-fault-tolerance-status type=node. This command is executed from the Controller Virtual Machine (CVM) and checks the cluster's fault tolerance status specifically for node failures, providing insights into how the cluster's data resiliency and redundancy configurations are holding up against potential single-node failures.

Reference: Nutanix CLI Guide, Nutanix Fault Tolerance Documentation.

If link aggregation is failing to pass traffic and is only showing a status of 'configured,' the most likely cause is a failed negotiation due to a misconfiguration on the Top-of-Rack (ToR) switches. This typically occurs when the aggregation protocols (like LACP) or the settings on the ToR switches do not match the configuration on the hosts. Ensuring that both ends of the aggregated links are configured identically and properly for the expected protocols is critical for successful link aggregation.

Reference: Nutanix Network Configuration Guide, Best Practices for Network Aggregation.

For a Nutanix cluster configuration that simplifies future deployments and expansions, disabling multicast and broadcast flood optimizations (A) and using a tagged VLAN for the CVM and hypervisor hosts (C) are the best practices. Disabling these optimizations helps in reducing unnecessary network traffic and potential broadcast storms in a growing environment. Using tagged VLANs for CVM and hypervisor hosts ensures proper network segmentation and scalability, allowing for easier management and expansion without reconfiguring the native network setup for each expansion or deployment.

Reference: Nutanix Network Configuration Best Practices, Nutanix Deployment Guide.