[2024年更新]合格できるD-UN-DY-23試験にはリアルな問題解答
D-UN-DY-23試験問題ゲット最新[2024]と正解回答
Dell Unityストレージシステムは、ストレージのパフォーマンスと効率を改善することを目的とした多くの組織に人気のある選択肢です。このシステムは、簡素化された管理とスケーラビリティを備えた高性能ストレージを提供するように設計されています。EMC D-UN-DY-23認定試験は、ITプロフェッショナルがDell Unityストレージシステムを効果的に展開および管理するために必要な知識とスキルを確認することを目的としています。
EMC D-UN-DY-23試験は、Dell EMC Unityストレージシステムの展開と管理に関するさまざまなトピックをカバーする包括的なテストです。試験のトピックには、ハードウェアおよびソフトウェアのインストール、ストレージリソースの構成、データ保護とレプリケーション、監視とトラブルシューティングが含まれます。候補者はこれらのトピックについて深い理解を示し、その知識を実世界のシナリオに適用できる能力を持っている必要があります。
質問 # 18
What is a benefit of using vVols?
- A. They enable the assignment of isolated file storage partitions.
- B. They enable the automatic import of capability profiles from vSphere to Unisphere.
- C. Individual VMs on a datastore can be snapped.
- D. All VMs on a datastore are snapped simultaneously.
正解：C
解説：
Explanation
A benefit of using vVols is that individual VMs on a datastore can be snapped. vVols are virtual volumes that are stored on a storage array and managed by vSphere. They enable granular control and management of VM storage. With vVols, each VM has its own set of virtual disks that are mapped to corresponding storage objects on the array. This allows the array to perform snapshot operations on individual VMs without affecting other VMs on the same datastore.
References: [Dell EMC Unity: VMware vSphere Virtual Volumes (vVols) Implementation]
質問 # 19
What is the maximum time difference allowed between the current system time (UTC) and the NTP server time during the initial configuration of a Dell Unity system?
- A. 5 min
- B. 7 min
- C. 15 min
- D. 17 min
正解：D
解説：
Explanation
If the time difference between the current system (UTC) time and the NTP server time is too large (approximately 17 minutes), the user cannot configure an NTP server during initial configuration. The user will need to adjust the time while in "Set time manually" mode before changing to "Enable NTP synchronization". This is to avoid potential issues with data replication, snapshots, and audit logs that rely on accurate time stamps. References: Dell EMC Unity: How to change System Time from 'Set time manually' option to NTP2, page 1.
質問 # 20
In an asynchronous replication, what is the maximum number of replicated NAS servers supported for the Dell Unity XT 380 series?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
Explanation
The maximum number of replicated NAS servers supported for the Dell Unity XT 380 series in an asynchronous replication is 126. This is the same as the maximum number of NAS servers supported for the Dell Unity XT 380 series in general. Asynchronous replication is a method of replicating data between two Dell Unity systems with a configurable recovery point objective (RPO). It allows the source system to continue normal operations without waiting for the destination system to acknowledge the completion of the replication.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: NAS Capabilities]
質問 # 21
What does the Dell Unity XT system do after a NAS server starts outbound traffic to an external service?
- A. Uses the active production interface
- B. Uses Packet Reflect for outbound communication
- C. Selects interfaces that are based on advance static routes
- D. Creates an active interface buffer cache in DRAM
正解：B
解説：
Explanation
Packet Reflect is a feature that enables the Dell Unity XT system to use the same interface for outbound communication that was used for inbound communication. This feature is useful when the Dell Unity XT system needs to initiate outbound traffic to an external service, such as DNS, NTP, LDAP, or SMTP. By using Packet Reflect, the Dell Unity XT system can avoid routing issues, firewall restrictions, or network address translation problems that may occur when using a different interface for outbound communication. When a NAS server starts outbound traffic to an external service, the Dell Unity XT system uses Packet Reflect to send the packets through the same interface that received the packets from the external service. Therefore, the correct answer is D. Uses Packet Reflect for outbound communication. References:
Dell EMC Unity: NAS Capabilities
Dell EMC Unity: Unisphere Overview
質問 # 22
Which firewall ports are required to be open for a successful outbound connection when configuring integrated secure connect gateway?
- A. 80 and 443
- B. 80 and 9443
- C. 443 and 8443
- D. 9443 and 443
正解：C
解説：
Explanation
The firewall ports that are required to be open for a successful outbound connection when configuring integrated secure connect gateway are 443 and 8443. Integrated secure connect gateway is a feature that enables secure remote access to the Dell Unity system through the Unisphere Central web portal. It requires an outbound connection from the Dell Unity system to the Unisphere Central server over the internet. Port 443 is used for HTTPS communication and port 8443 is used for WebSocket communication.
References: [Dell EMC Unity: Unisphere Overview], [Dell EMC Unity: Integrated Secure Connect Gateway]
質問 # 23
Which I/O modules does the Unity 380/380F system support?
- A. 12 Gb/s SAS
10 GbE Base-T - B. 32 Gb/s Fibre Channel
2-Port 100 GbE - C. 12 Gb/s SAS
2-Port 100 GbE - D. 32 Gb/s Fibre Channel
10 GbE Base-T
正解：A
解説：
Explanation
The Unity 380/380F system supports two types of I/O modules: 12 Gb/s SAS back-end and 10 GbE Base-T front-end. The 12 Gb/s SAS back-end module provides connectivity to the disk drives and expansion enclosures, while the 10 GbE Base-T front-end module provides network connectivity to the hosts and clients.
The Unity 380/380F system has four I/O module slots, two for each SP. The 12 Gb/s SAS back-end module must be installed in slot 0 of each SP, and the 10 GbE Base-T front-end module can be installed in slot 1 of each SP. Therefore, the correct answer is C. 12 Gb/s SAS 10 GbE Base-T. References:
Dell EMC Unity: Hardware Information Guide
Dell EMC Unity: Installation Guide
質問 # 24
What is a characteristic of Host Groups?
- A. Access to block storage resources must be set before adding hosts to a host group.
- B. Hosts added to a host group must not have mapped block storage resources.
- C. Block storage resources addedlo a host group are accessible to all the member hosts
- D. Block storage resources attached to one of the member hosts are accessible to the entire host group.
正解：C
解説：
Explanation
A characteristic of Host Groups is that block storage resources added to a host group are accessible to all the member hosts. A Host Group is a logical grouping of hosts that share the same access permissions and settings for block storage resources. By adding block storage resources to a host group, the user can simplify the management and allocation of storage for multiple hosts. Access to block storage resources does not need to be set before adding hosts to a host group, as the access permissions can be modified later. Hosts added to a host group can have mapped block storage resources, as long as they are not in conflict with the host group resources. Block storage resources attached to one of the member hosts are not accessible to the entire host group, unless they are also added to the host group.
References: [Dell EMC Unity: Host Configuration], [Dell EMC Unity: Block Storage Provisioning]
質問 # 25
Which is the preferred FC Port for synchronous replication for a Dell Unity XT 380 system?
- A. Port 1 of I/O module 0
- B. Port 0 of I/O module 1
- C. Fibre Channel Port 0 of I/O module 0
- D. Fibre Channel Port 4 of SPA and SPB www*
正解：D
質問 # 26
A company needs to expand their dynamic pool by 10 TB. The current dynamic pool consists of 63 7.6 TB SSD drives that are configured for RAID 5 (12+1).
What is the minimum number of drives needed for the pool expansion?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
Explanation
To expand a dynamic pool, the number of drives added must be equal to or greater than the stripe width of the pool. The stripe width is the number of data drives plus the number of parity drives in a RAID group. In this case, the stripe width is 12 + 1 = 13. Therefore, the minimum number of drives needed for the pool expansion is 13. References: Dell EMC Unity: Dynamic Pools Technical White Paper1, page 8.
質問 # 27
An administrator has configured a Host Group to have access to a storage object.
What are two benefits of this configuration? (Choose two.)
- A. Provides multiple hosts the same access to NFS Filesvstems
- B. Ensures that block storage is replicated to the same hosts
- C. Provides multiple hosts access to the same VMFS Datastores
- D. Ensures that snapshots are applied to all LUNs in the group
- E. Provides multiple hosts access to the same LUNs
正解：C、E
解説：
Explanation
A Host Group is a logical grouping of hosts that share the same access permissions to storage objects, such as LUNs, VMFS Datastores, or NFS Filesystems. By configuring a Host Group, an administrator can simplify the management of multiple hosts and ensure consistent access to the storage resources. Some of the benefits of using a Host Group are:
Provides multiple hosts access to the same VMFS Datastores: A VMFS Datastore is a block-based storage object that is formatted with the VMware File System (VMFS) and used to store virtual machine files. A VMFS Datastore can be shared by multiple hosts that are part of a VMware cluster. By adding these hosts to a Host Group and assigning the VMFS Datastore to the Host Group, the administrator can ensure that all the hosts have the same access permissions and can access the virtual machines on the Datastore.
Provides multiple hosts access to the same LUNs: A LUN is a block-based storage object that is presented to a host as a SCSI device. A LUN can be shared by multiple hosts that have the same operating system and use a cluster-aware file system. By adding these hosts to a Host Group and assigning the LUN to the Host Group, the administrator can ensure that all the hosts have the same access permissions and can access the data on the LUN.
References:
Dell EMC Unity: Host Configuration
Dell EMC Unity: VMware ESXi Hosts and Clusters
質問 # 28
What is the result of enabling Data Reduction on a LUN in a consistency group containing three LUNs?
- A. Data Reduction will be enabled on all LUNs is the consistency group.
- B. Any writes to the LUN will go through the Data Reduction logic.
- C. All writes to all consistency group LUNs will go through the Data Reduction logic.
- D. Data Reduction and Advanced Deduplication will be enabled on all LUNs.
正解：C
解説：
Explanation
Data Reduction is a feature that reduces the amount of physical storage space required to store user data on a LUN. Data Reduction is enabled at the LUN level and applies to all the data in the LUN, including snapshots and thin clones. Data Reduction consists of two components: compression and deduplication. Compression reduces the size of data blocks by removing redundant information, while deduplication eliminates duplicate blocks across the LUN. When Data Reduction is enabled on a LUN, all writes to the LUN will go through the Data Reduction logic before being written to the storage pool. If the LUN is part of a consistency group, Data Reduction will be enabled on all the LUNs in the consistency group, and all writes to any LUN in the group will go through the Data Reduction logic. This ensures that the data in the consistency group is consistent and protected by the same Data Reduction settings. References:
Dell EMC Unity: Data Reduction Overview
Dell EMC Unity: Data Reduction Configuration and Best Practices
質問 # 29
Which snapshot option is set automatically when a Pool is configured?
- A. Pool Automatic Deletion Policy
- B. Snapshot Pool Consumption
- C. Total Pool Consumption
正解：A
解説：
Explanation
The snapshot option that is set automatically when a pool is configured is the Pool Automatic Deletion Policy.
This option determines how the system handles the deletion of snapshots when the pool reaches a certain threshold of capacity utilization. The user can choose between three policies: Never Delete, Delete Oldest, or Delete LowestPriority. The Total Pool Consumption and the Snapshot Pool Consumption are not snapshot options, but rather metrics that show the amount of pool space consumed by the pool data and the snapshots respectively.
References: [Dell EMC Unity: Storage Pools and RAID Groups], [Dell EMC Unity: Snapshots and Thin Clones]
質問 # 30
On a Dell Unity XT file system asynchronous replication session, how many system Snapshots are required to support replication?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
Explanation
On a Dell Unity XT file system asynchronous replication session, four system Snapshots are required to support replication. Two system Snapshots are created on the source file system, and two system Snapshots are created on the destination file system. The source system Snapshots are used to track the changes that need to be replicated, and the destination system Snapshots are used to apply the changes and maintain a consistent point-in-time copy of the source data. The system Snapshots are automatically created and managed by the replication engine and are not visible to the user.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: File System Configuration]
質問 # 31
An administrator notices that the communications between Unisphere and the storage system get interrupted.
Which service task should the administrator perform to fix the issue with minimal impact?
- A. Reboot Storage Processor
- B. Reinitialize
C Enable SSH - C. Restart Management Software
正解：C
解説：
Explanation
The service task that the administrator should perform to fix the issue with minimal impact is Restart Management Software. This service task restarts the management software on both storage processors without affecting the data services or the host I/O. This can resolve the communication issues between Unisphere and the storage system. Reinitialize, Enable SSH, and Reboot Storage Processor are service tasks that have more impact and risk than Restart Management Software.
References: [Dell EMC Unity: Unisphere Overview], [Dell EMC Unity: Service Tasks]
質問 # 32
Which is the preferred FC Port for synchronous replication for a Dell Unity XT 380 system?
- A. Port 1 of I/O module 0
- B. Port 0 of I/O module 1
- C. Fibre Channel Port 0 of I/O module 0
- D. Fibre Channel Port 4 of SPA and SPB www*
正解：D
解説：
Explanation
The preferred FC Port for synchronous replication for a Dell Unity XT 380 system is Fibre Channel Port 4 of SPA and SPB. This port is dedicated for synchronous replication traffic and has the highest priority and bandwidth allocation. Synchronous replication is a method of replicating data between two Dell Unity systems with zero recovery point objective (RPO). It requires a low-latency and high-bandwidth network connection between the source and destination systems.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: Hardware Information Guide]
質問 # 33
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EMC D-UN-DY-23認定試験は、世界中の組織に認められているベンダー非依存型の認定資格です。この認定資格は、使用している特定のハードウェアやソフトウェアソリューションに関係なく、Dell Unityストレージシステムの知識を検証するために設計されています。これにより、ストレージ業界で知識とスキルを広げたいITプロフェッショナルにとって、優れた選択肢となります。
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