Free Nutanix NCS-Core Practice Exam with Questions & Answers | Set: 4

Ref: https://portal.nutanix.com/page/documents/details?targetId=System-Specs-G6-Single-Node:set-block-connect-c.html

When changing VLAN configurations for hosts and Controller Virtual Machines (CVMs) in a Nutanix cluster, doing so while the cluster is running can result in temporary communication losses, leading to alerts such as a node appearing down. To avoid these disruptions and ensure a smooth reconfiguration process, it is advisable to stop the cluster services before making VLAN changes. This prevents the cluster from detecting intermittent connectivity as node failures, thereby avoiding false alerts in Prism Element.

References:

• Nutanix Bible (https://www.nutanixbible.com), particularly the sections discussing cluster operations and network reconfiguration.
• Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), which includes best practices for network configuration.

To troubleshoot physical network mis-cabling without physical access to the data center and connected to Cisco Nexus 9k switches, the appropriate command to run from the Nutanix AHV host is lldpctl. This command allows the consultant to view the Link Layer Discovery Protocol (LLDP) information about directly connected devices. LLDP is supported on Nexus switches and provides detailed network topology information, which is crucial for identifying how the AHV nodes are connected to the switches, and to verify correct physical connections.References: Nutanix Command Reference Guide, Cisco Nexus 9000 Series documentation.

If the consultant logs into Prism Element and sees critical error messages related to the hypervisor and NTP, this could likely be caused by misconfigured Name Server settings. The Name Server (DNS) is essential for resolving domain names into IP addresses, which are required for NTP operations and overall cluster health checks and communications within the Nutanix environment.References: Nutanix Bible, Nutanix University NCS-Core 6.8 learning materials

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.

References:

• 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.

When a NearSync Replication window is missed due to high write volume during nightly backups, the expected behavior of the system is to adjust the replication schedule temporarily and continuously attempt to return to the configured NearSync schedule. The correct answers are:

Option B, "Protection Domain transitions back to the hourly schedule." If the NearSync cannot maintain the 15-minute schedule due to excessive write volume, it may temporarily fall back to a less frequent schedule, such as hourly, to stabilize.

Option D, "The system continuously tries to get to the NearSync schedule." NearSync is designed to handle transient high-load situations by trying to catch up and revert to the pre-set NearSync schedule as conditions allow.

References:These behaviors are outlined in the Nutanix documentation for NearSync, which describes how the system manages periods of high I/O and missed replication windows.

For high-performance iSCSI workloads, especially in a Nutanix environment using AHV nodes and a 10 GbE interface, enabling Jumbo Frames on both the Host and the Controller Virtual Machine (CVM) is recommended. Jumbo Frames allow for a larger payload per network packet, which reduces the overhead required to send large amounts of data. Enabling Jumbo Frames on both the host and the CVM ensures that both ends of the communication channel can handle larger packets, thereby optimizing throughput and reducing latency for high-performance workloads.

References:

• Nutanix Bible: Networking Best Practices
• Nutanix University: Nutanix Network Optimization

To meet the customer's requirements for high availability and the ability to manage up to 12,500 VMs, the consultant should use Prism Central Scale-out deployment. This deployment mode allows Prism Central to be scaled out across multiple instances, significantly enhancing both performance and resilience, ensuring that the management and operations of a large number of VMs can be handled efficiently and without a single point of failure.References: Nutanix Bible, Nutanix University NCS-Core 6.8 learning materials

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.

To validate the installed version of an NVIDIA driver in a Nutanix environment with AHV or within the CVM, use the command:

This command checks for all RPM packages related to NVIDIA installed on the Controller Virtual Machine, providing details about the driver version.

References:

• Nutanix Bible (https://www.nutanixbible.com), especially sections on AHV and CVM maintenance commands.
• Nutanix University: NCS-Core 6.8 Training (https://university.nutanix.com), which covers command-line tools and driver management.