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NCS-Core Practice Questions

Question # 1
A customer is considering increasing the Redundancy Factor from 2 to 3 for a Nutanix cluster in their existing environment. Which option would provide the company with the optimal solution?
A. Four Compute Nodes with 25% available disk space
B. Six Compute Nodes with 25% available disk space
C. Three Compute Nodes with 40% available disk space
D. Five Compute Nodes with 40% available disk space


B. Six Compute Nodes with 25% available disk space

Explanation: 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.

Question # 2
A consultant attempts to perform an LCM inventory after successfully creating the cluster, but is met with the following error:
LCM Exception [LcmExceptionHandler]: Could not find a module for entity with reference name nutanix.ncc.update
What is the most likely reason LCM inventory/update is failing?
A. Nameservers are not reachable.
B. IPMI network is unable to reach the internet.
C. Clusters must be licensed before LCM inventory.
D. Nutanix CVMs are blocking TCP port 54.


C. Clusters must be licensed before LCM inventory.

Explanation: The error encountered during the LCM inventory process, which mentions "Could not find a module for entity with reference name nutanix.ncc.update," typically indicates that the cluster has not yet been licensed. The Life Cycle Management (LCM) functionality in Nutanix systems requires a valid license to perform operations such as inventory checks and updates. Without this license, LCM cannot retrieve or update the necessary software modules, leading to the stated error. Licensing the cluster would resolve this issue and allow the LCM processes to proceed normally.

Question # 3
A customer with a four-node RF2 cluster is adding application VMs to their system. After adding these VMs, the Prism dashboard shows 81% storage utilization. What is the consequence of running the cluster at 81% storage utilization?
A. The customer has the ability to add more VMs up to the 100% storage utilization.
B. There is available capacity in the storage fabric and the cluster is resilient.
C. Node failure is imminent due to storage utilization.
D. The cluster is not resilient in the storage fabric


D. The cluster is not resilient in the storage fabric

Explanation:

https://next.nutanix.com/how-it-works-22/recommended-maximum-storage-utilization-3723 4


Question # 4
What is the default password shipped on new NX hardware from the factory for the ADMIN user on IPMI?
A. node-serial-number
B. nutanix/4u
C. block-serial-number
D. ADMIN


A. node-serial-number

Explanation:
Nutanix Security: As part of security improvements (complying with California statute SB-327), Nutanix changed the default IPMI password policy.
Node-Specific Password: Each Nutanix NX hardware node now ships with a unique default IPMI password for the ADMIN user.expand_more This password is the node's serial number (using capital letters).expand_more.
Finding the Serial Number: You can locate the node's serial number either on a physical sticker or by running the ipmitool fru print command on the node.

Question # 5
A consultant asks a customer to verify the ToR Switch data port configuration was done according to Nutanix best practices. The switch configuration must simplify future deployments and expansions. Which two configuration actions will satisfy this requirement? (Choose two.)
A. Disable multicast and broadcast flood optimizations.
B. Configure the CVM and hypervisor host VLAN as the native.
C. Use a tagged VLAN for the CVM and hypervisor hosts.
D. Configure the connected switch ports as access.


A. Disable multicast and broadcast flood optimizations.
C. Use a tagged VLAN for the CVM and hypervisor hosts.

Explanation: 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.References: Nutanix Network Configuration Best Practices, Nutanix Deployment Guide.

Question # 6
An administrator has a VM that consumes large amounts of storage and has the following characteristics:
• Create large / sequential writes
• Data must be kept for years
• Data is normally only accessed at the end of the year to run report
The administrator decides to use Erasure Coding to save space.
Which feature should the administrator utilize to save space for this VM?
A. Inline Compression
B. Flash Mode
C. Cache Dedup
D. Post-Process Compression


D. Post-Process Compression

Explanation:
Erasure coding is a method of data protection in which data is broken into fragments, expanded and encoded with redundant data pieces, and stored across a set of different locations or storage media. The goal of erasure coding is to enable data that becomes corrupted at some point in the disk storage process to be reconstructed by using information about the data that’s stored elsewhere in the array1.
In the context of Nutanix, erasure coding increases the usable capacity on a cluster. Instead of replicating data, erasure coding uses parity information to rebuild data in the event of a disk failure1. The capacity savings of erasure coding is in addition to deduplication and compression savings1.
Given the characteristics of the VM in the question (large/sequential writes, data kept for years, data accessed only at the end of the year), Post-Process Compression would be the most suitable feature to utilize to save space. This is because Post-Process Compression, as the name suggests, compresses data after it has been written to the storage, which is suitable for data that is not accessed frequently2.

Question # 7
During the Knowledge Transfer, the customer askes where to find the details about their Nutanix environment, such as IP addresses, storage containers, and configuration. Where can the consultant find this information?
A. Support Portal
B. As-Built Guide
C. Test Plan
D. Tech Checklist


B. As-Built Guide

Explanation: The As-Built Guide is a comprehensive document typically prepared at the end of a Nutanix deployment project. It includes detailed information about the Nutanix environment, such as IP addresses, storage container settings, hardware and software configurations, and other deployment specifics. This document serves as a reference for the customer to understand their deployed infrastructure and for any future modifications or troubleshooting needs.

Question # 8
A consultant has been tasked with increasing security on a Nutanix cluster by disabling password authentication when accessing the CVM and AHV hosts and instead moving to key-based SSH. What is the easiest way for the consultant to meet these requirements?
A. Enable STlGs via command line on SSH to a CVM.
B. Configure LDAP authentication through a secure server.
C. Enable Cluster Lockdown and provide an RSA key.
D. Restrict access with User Management in Prism.


C. Enable Cluster Lockdown and provide an RSA key.

Explanation:
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.

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Nutanix NCS-Core Exam Dumps

Exam Name: Nutanix Certified Services Core Infrastructure Professional Exam
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