Nutanix Certified Services Core Infrastructure Professional v6.8 NCS-Core Exam Questions

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Total 302 questions
Question 1

A consultant creates an AHV cluster and connects the Intel X550T NICs to the top of rack switch using Twinax cables. The activity and link lights are green. The cluster cannot communicate over the 10GbE link.

What is the first command the consultant should perform to troubleshoot the issue?



Answer : B

When facing issues with network communication over 10GbE links, the first command to troubleshoot is manage_ovs show_interfaces. This command allows the consultant to review the operational status and settings of each network interface, including those connected via Twinax cables to the top of rack switch. This will show whether the interfaces are correctly configured and functioning, which is essential for establishing a successful network link.


Nutanix Command Reference Guide: https://portal.nutanix.com

Nutanix Community Network Troubleshooting Tips: Nutanix Community

Question 2

A consultant and customer agree on a scope of services regarding the deployment of a new Nutanix cluster.

Which two products does this scope apply to? (Choose two.)



Answer : A, D

The scope of services for the deployment of a new Nutanix cluster would apply to both Foundation and Prism Central. Foundation is the initial software used for deploying Nutanix nodes and creating clusters, essential for setting up the environment. Prism Central is used for managing multiple clusters and is integral to the operational scope of the service, providing centralized management capabilities. Reference: Nutanix Bible, Nutanix University NCS-Core 6.8 learning materials


Question 3

A customer's security team has a policy prohibiting a consultant's laptop from connecting within the corporate datacenter.

In which two ways should the consultant complete the customer deployment on the factory-prepared nodes? (Choose two.)



Answer : A, C

Given that the customer's security policy prohibits connecting a consultant's laptop within the corporate datacenter, the consultant can complete the deployment using:

A . The Controller VM-based Foundation process, which allows the consultant to configure and deploy the cluster using the software tools provided within the Controller VM itself. This method does not require direct laptop connection to the network. C. Run the Network Crashcart Script to manually configure IP addresses on the hosts and then proceed to create the cluster manually. This approach involves using available scripts and utilities that can be executed from within the data center's management interfaces without needing direct laptop access. Options B and D would typically require direct network connection capabilities not permissible under the security constraints. Reference: Nutanix Foundation Documentation, Nutanix Deployment Best Practices.


Question 4

A customer design calls for link aggregation. Despite the consultant verifying all hosts are correctly configured for fallback per Nutanix best practices, initial testing reveals the aggregate bond fails to pass traffic and shows a status of configured.

What is the most likely cause for the bond disabling and reporting a "configured" status?



Answer : C

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.


Question 5

In a 20-node ESXi deployment, the customer needs additional resiliency to survive the loss of two nodes concurrently.

Which configuration should the consultant use to ensure that the appropriate resources are available?



Answer : C

To ensure additional resiliency in a 20-node ESXi deployment capable of surviving the concurrent loss of two nodes, the consultant should configure the system with a storage reservation and HA (High Availability) admission control each set to 5%, combined with a cluster redundancy factor (RF) of 3. RF3 provides the capability to tolerate the failure of up to two nodes without data loss, thus enhancing the cluster's resilience. This configuration is optimal for maintaining cluster availability and integrity during multiple node failures. Reference: Nutanix Bible, Nutanix University


Question 6

During the cluster deployment, a consultant conducts operational tests on a vCenter-managed ESXi hypervisor.

As a part of tests, vCenter must place the host into maintenance mode, however, the task is stuck and the CVM is not shutting down automatically.

What should the consultant do to resolve the issue?



Answer : E

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

Question 7

A consultant installs a new AHV cluster and moves the cluster into the customer's environment. Alter the move, the consultants notice that traffic is not being balanced across the physical NICs. The ToR switches have been configured with LACP.

Within Prism Element, which AHV network option should be set to resolve the issue?



Answer : B

In a situation where traffic is not being balanced across the physical NICs and the Top-of-Rack (ToR) switches have been configured with LACP (Link Aggregation Control Protocol), the appropriate AHV network configuration to resolve this issue within Prism Element is 'Active-Active.' This setting enables both NICs to actively handle traffic, which, combined with LACP, allows for load balancing and redundancy, effectively utilizing all available network paths. This setup ensures that traffic is spread evenly across the physical NICs, maximizing network throughput and resilience.


Nutanix Prism User Guide

Nutanix AHV Administration Guide

In a scenario where a new AHV cluster is installed and the traffic is not being balanced across the physical NICs despite the ToR switches being configured with LACP, the appropriate network option to set within Prism Element is Active-Active. This configuration allows for a traffic-hashing algorithm, such as balance-TCP, to split traffic between multiple links in an active-active fashion.Since the uplinks appear as a single L2 link, the algorithm can balance the traffic among bond members without any regard for switch MAC address tables1.

Nutanix Community: AHV Networking | Enable, Disable and Verify LACP1

Nutanix Support & Insights: Layer 2 Network Management2

Nutanix Support & Insights: Enabling LAG and LACP on the ToR Switch (AHV Only)

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Total 302 questions