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質問 # 173 
An administrator has opened the Enable Multi-Cluster configuration for an NDB instance, but the wizard does not present the VLAN, as shown in the exhibit.
Which configuration allows to choose a VLAN in the drop-down box?
正解：A
解説：
The provided exhibit shows the "Enable Multi-Cluster" configuration wizard in NDB, where the VLAN dropdown is empty with a "Nothing found" message, indicating that no VLANs are available for selection.
This issue arises because NDB requires a network profile to be created before provisioning the NDB Agent VM and enabling multi-cluster support. A network profile defines the static VLANs managed by NDB, which are essential for network configuration during multi-cluster setup. The warning in the exhibit ("An NDB managed static vLAN is required to provision the NDB Agent VM. Add an NDB managed static vLAN using the Networks page to continue.") reinforces that the administrator must create a network profile via the Networks page to populate the VLAN dropdown.
Option A (A network profile must be created first) is correct as it addresses the root cause by ensuring VLANs are defined in a network profile.
Option B (Verify if subnet leverages advanced network control) is incorrect because advanced network control is not a prerequisite for VLAN selection in this context.
Option C (IP address pool must be managed in NDB) is incorrect because IP address pools are managed separately and not required for VLAN selection at this stage.
Option D (VLAN subnet must use IP address management) is incorrect because IP address management is not a direct requirement for enabling VLAN selection in the wizard.
After creating the network profile, the administrator can proceed with the multi-cluster enablement.
References
Nutanix Database Service (NDB) User Guide, Chapter 3: Configuring an NDB Environment, Section:
Configuring Network Profiles for Multi-Cluster
Nutanix Support & Insights, Knowledge Base Article: "Troubleshooting VLAN Issues in NDB Multi-Cluster Setup" Nutanix Certified Professional - Database Automation (NCP-DB) v7.5Blueprint, Section 3: Configure an NDB Environment
質問 # 174
An administrator needs to take multiple snapshots per day and retain them for one week. How should the administrator define and schedule the SLA?
正解：B
解説：
The correct answer is D because it matches the requirement of taking multiple snapshots per day and retaining them for one week. Option A is incorrect because it only takes one snapshot per day, which is not enough for the administrator's need. Option B is incorrect because it only retains the snapshots for one week, which means the older snapshots will be deleted after seven days. Option C is incorrect because it only takes two snapshots per week, which is not frequent enough for the administrator's need.
References: The following sources provide more information about the SLA retention policies and how to create and modify them in NDB:
* Nutanix Database Management & Automation (NDMA) course, Module 4: Protecting Databases Using Time Machine, Lesson 4.1: Creating and Modifying SLA Retention Policies
* Nutanix Certified Professional - Database Automation (NCP-DB) v6.5, Knowledge Objectives, Section
5 - Protect NDB-managed Databases Using Time Machine
* Nutanix Database Service (NDB) User Guide, Chapter 6: Protecting Databases Using Time Machine, Section 6.1: Creating and Modifying SLA Retention Policies
質問 # 175
When provisioning an PostgreSQL HA Instance, what are the minimum and maximum number of DB server VMs that can be deployed in a cluster?
正解：B
解説：
When provisioning a PostgreSQL HA Instance using NDB, the minimum and maximum number of DB server VMs that can be deployed in a cluster are 2 and 4, respectively. A PostgreSQL HA Instance is a database instance that provides high availability and fault tolerance for PostgreSQL databases using the Patroni framework. Patroni is a Python-based tool that manages PostgreSQL configuration and performs automatic failover and switchover operations. Patroni relies on a distributed consensus store, such as etcd, Consul, or ZooKeeper, to store and synchronize the cluster state and leader information. NDB supports etcd as the consensus store for PostgreSQL HA Instances. NDB allows the administrator to provision PostgreSQL HA Instances with different sizes and configurations, such as small, medium, large, or custom. The size of thePostgreSQL HA Instance determines the number of DB server VMs, the number of etcd nodes, the CPU, memory, and disk resources, and the replication factor of the database. The minimum number of DB server VMs for a PostgreSQL HA Instance is 2, which corresponds to a small size instance. This configuration provides one leader and one follower DB server VM, and one etcd node. The maximum number of DB server VMs for a PostgreSQL HA Instance is 4, which corresponds to a large size instance. This configuration provides one leader and three follower DB server VMs, and three etcd nodes. The other options are not valid for a PostgreSQL HA Instance, as they either do not provide enough redundancy or exceed the supported limit of DB server VMs. References:
* Nutanix Certified Professional - Database Automation (NCP-DB) v6.5, Section 2 - Deploy and Configure an NDB Solution, Objective 2.2: Configure an NDB Instance
* Nutanix Database Management & Automation (NDMA) Course, Module 3: Nutanix Database Service (NDB) Installation and Configuration, Lesson 3.2: Configuring NDB, Topic: Provisioning PostgreSQL HA Instances
* Nutanix Database Service (NDB) User Guide, Chapter 4: Provisioning Databases, Section: Provisioning PostgreSQL HA Instances
* [PostgreSQL High Availability: Under the Hood - Nutanix.dev], Section: PostgreSQL HA Architecture and Components
質問 # 176
An administrator needs to deploy a cumulative update (CU) for SQL Server.
What steps would the administrator take to prepare this deployment with NDB?
正解：C
解説：
The correct answer is C because it follows the recommended procedure for applying a CU to a SQL Server Software Profile in NDB. By applying the patch to the profile VM, the administrator ensures that the CU is compatible with the existing Software Profile settings and configuration. By creating a new Software Profile version, the administrator preserves the previous version of the Software Profile for rollback purposes and allows the new version to be tested and published. Option A is incorrect because it deletes the existing Software Profile, which may cause data loss and prevent rollback. Option B is incorrect because it does not apply the patch to the profile VM, which may result in errors or inconsistencies in the Software Profile.
Option D is incorrect because it creates a new Software Profile instead of a new version, which may cause confusion and duplication.
The following sources provide more information about the Software Profile management and patching in NDB:
Nutanix Database Management & Automation (NDMA) course, Module 5: Patching Databases Using NDB, Lesson 5.2: Creating and Modifying Software Profiles Nutanix Certified Professional - Database Automation (NCP-DB) v6.5, Knowledge Objectives, Section 4 - Operate and Maintain an NDB Environment Nutanix Database Service (NDB) User Guide, Chapter 5: Patching Databases Using NDB, Section 5.2:
Creating and Modifying Software Profiles
Nutanix Database Service (NDB) User Guide, Chapter 5: Patching Databases Using NDB, Section 5.3:
Testing and Publishing Database Patches
質問 # 177
An administrator wants to enable Multi-Cluster management on an Era installation.
Which prerequisites must be satisfied to complete this task?
正解：D
解説：
For enabling Multi-Cluster management on an Era installation, the hypervisor version must be supported and port 9440 must be open between the Era VM and clusters. This ensures that the Era VM can communicate with the clusters for management tasks1.
質問 # 178
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