Data Domain Specialist Exam for Implementation Engineers
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Exam Code
E20-385
Exam Name
Data Domain Specialist Exam for Implementation Engineers
Questions
171 Questions Answers With Explanation
Update Date
04, 14, 2026
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EMC E20-385 Sample Question Answers
Question # 1
When a customer deploys an EMC Data Domain system at a remote location that does not
have an IT staff, what type of remote management method(s) is possible?
A. Managed with IPMI and SOL commands B. Managed with IPMI commands only C. Managed with SOL commands only D. Managed with iDRAC and SOL commands
Answer: A
Question # 2
An EMC NetWorker customer has recently implemented an EMC Data Domain system
using DD Boost devices. A second Data Domain system was implemented at a remote site
for replication purposes using clone-controlled replication.As part of the implementation, Client Direct was enabled for some of the backup clients.
What is the result of enabling this setting on these clients?
A. Backup data is sent directly to the Data Domain system B. Replication data is sent directly to the second Data Domain system at the same time the backup is occurring C. Cloned backup data can be directly recovered from the second Data Domain system D. Backup jobs can start without depending on the server configuration
Answer: A
Question # 3
If a customer has an EMC Data Domain (DD) system with Extended Retention, which additional software license can be applied to the system?
A. DD Retention Lock Governance B. DD Encryption C. DD Full Capacity D. DD Nearline
Answer: A
Question # 4
Which two licenses are tied to capacity on an EMC Data Domain system?
A. Expanded and shelf capacity B. Added storage and shelf extension C. Storage expansion and shelf capacity D. Expanded shelf and expanded capacity
Answer: A
Question # 5
You are tasked with installing a new EMC Data Domain system in an existing NetWorker
environment. The customer requirements state that they need the ability to perform multiple
concurrent clone operations from the same device.Which device type(s) supports the customer's requirements?
A. Data Domain device only B. Data Domain device and file type device C. Storage unit device type only D. Data Domain device and disk pool device type
Answer: A
Question # 6
NetBackup has been configured to use an EMC Data Domain appliance as a VTL for the
primary target storage unit. Which multiplexing setting should be configured within the
NetBackup storage unit to achieve optimal deduplication performance on the Data
Domain?
A. Disabled B. Unlimited C. 2 D. 4
Answer: A
Question # 7
A customer has an EMC Data Domain integrated into their Symantec NetBackup domain
as an OST device at their production site. They are installing a new NetBackup media
server and a second Data Domain at their disaster recovery (DR) site to protect their client
backup images.How should replication be configured to allow NetBackup to recover client backup data
from the DR site in the event the Data Domain at the production site goes offline?
A. Configure NetBackup to duplicate the images between the Data Domain OST devices B. Configure MTree replication from the production site to the DR site C. Perform snapshots of the NetBackup image directories and replicate those snapshots to the DR site D. Use fastcopy at the production site to make a copy of the NetBackup images and replicate them to the DR site
Answer: A
Question # 8
How can Retention Lock Compliance be removed from an EMC Data Domain system?
A. Reinstall the operating system from a USB key B. Run the file system destroy command C. Disable Retention Lock Compliance using security officer credentials D. Expire all locked data and then disable Retention Lock
Answer: A
Question # 9
An organization has Dell EMC Data Domain retention lock compliance enabled on an
MTree. Due to malicious tampering of the system clock: the file system is disabled.Which user role has the privilege required to enable the file system?
A. System admin B. Backup operator C. Limited admin D. Security officer
Answer: A
Question # 10
A customer is writing critical data to the pre-configured, default NFS export on an EMC
Data Domain system for replication to a remote site. Which directory on the local Data
Domain system should be reviewed to verify the data is successfully being written?
A. /data/col1/backup B. /ddvar C. /data/col1 D. /data/col1/repl
Answer: A
Question # 11
On an EMC Data Domain system, when does the "throttle" setting reduce resource allocation to the file system cleaning process?
A. When other operations run during file system cleaning B. Whenever file system cleaning runs C. Whenever any non-cleaning operation runs D. Only when replication runs during file system cleaning
Answer: A
Question # 12
Which CLI command will display information about disks in EMC Data Domain enclosures?
A. disk show state B. enclosure show topology C. enclosure show summary D. disk status
Answer: A
Question # 13
Which method of deduplication yields better deduplication results for multiple data types?
A. Variable segment size due to its ability to split the data stream into segments B. Variable segment size due to its ability to add data to a variable segment and move the data stream C. Fixed segment-based due to its ability to allow sub-file chunking of data D. Fixed segment size due to its ability to add data to a fixed segment and move the data stream
Answer: A
Question # 14
A customer has configured an MTree (/data/col1/departments) on an EMC Data Domain
system with two subdirectories configured as Sales and HR. They want to configure
replication to replicate only the Sales subdirectory to another Data Domain system. In
addition, they do not want to replicate the HR subdirectory.How can this be accomplished?
A. Move the Sales subdirectory to its own MTree B. Take a snapshot of the Sales subdirectory and replicate the snapshot C. Configure directory replication for the subdirectory /data/col1/departments/Sales D. Perform a fast copy of the subdirectory /data/col1/departments/Sales and replicate the copy
Answer: A
Question # 15
If cleaning is already in progress, when does data movement to the retention tier on a Dell
EMC Data Domain system start?
A. Already started; it occurs during cleaning B. Immediately after the cleaning completes C. After suspending the cleaning process D. During the next scheduled data movement
Answer: D
Question # 16
A company is replicating two specific directories between two EMC Data Domain systems
using a 4 Mb/s WAN connection. What can be done on the Data Domain systems to
maximize replication performance?
A. Enable low bandwidth optimization B. Implement collection replication C. Add more replication contexts D. Increase WAN bandwidth
Answer: C
Question # 17
If cleaning is already in progress, when does data movement to the Extended Retention
Tier start on an EMC Data Domain system?
A. Immediately after the cleaning completes B. In parallel to the cleaning C. During the next scheduled data movement D. During the next scheduled data balancing
Answer: A
Question # 18
A customer is deploying EMC Data Domain systems in four data centers worldwide. The Data Domain systems will be using VTL. Each system will have a unique tape pool.The customer wants to replicate data to all sites. The data needs to be encrypted locally
and then replicated to remote sites over the WAN. What needs to be deployed to meet the customer's requirements?
A. Encryption of Data at Rest and pool replication with encryption enabled B. Encryption of Data at Rest and collection replication with encryption enabled C. Pool replication with encryption enabled D. Collection replication with encryption enabled
Answer: A
Question # 19
When logging into an EMC Data Domain system during an initial installation, which connection type must be used?
A. Serial Console B. FTP C. Telnet D. IPMI
Answer: C
Question # 20
A customer environment has an EMC Data Domain system with Data Domain Extended
Retention enabled. The environment has three sealed extended retention units. The
customer notices a slight delay when accessing the oldest data sets.What is a potential reason for this issue?
A. Retention units may be swapped out of memory B. Retention units were marked "Ready Sealed" C. Retention units should be unsealed D. Retention unit data is encrypted
Answer: A
Question # 21
A company has decided to change their EMC Data Domain with NetWorker implementation
from physical tapes to VTL. What is a supported implementation?
A. Fibre Channel and NDMPq B. Fibre Channel and SMTP C. Ethernet and SSL D. Ethernet and RTPS
Answer: A
Question # 22
What is a characteristic of EMC Data Domain collection replication?
A. Replication destination is dedicated to receiving data only from the source B. Unique user accounts and passwords need to be configured on the replication destination C. Replication destination directory can also be used as a target for backups D. Replication destination must be at least twice the size of the source
Answer: A
Question # 23
When monitoring EMC Data Domain systems, an administrator sees the System Manager
File System Summary showing a compression factor of 20x. How is the equivalent value
shown in the "Reduction%" column?
A. 80 B. 90 C. 95 D. 96
Answer: C
Question # 24
A company is using AWS as a cloud provider and is trying to create a cloud unit. Which
certificate must be imported to the Dell EMC Data Domain system?
A. Load Balancer Root CA certificate B. Digicert High Assurance Root CA certificate C. Dell EMC Root certificate D. Baltimore CyberTrust Root CA certificate
Answer: B
Question # 25
You have deployed an EMC Data Domain system in a customer environment. Recently, the customer expressed concerns regarding data integrity issues.Which Data Domain system attributes protect against stored data corruption?
A. Checksum, self-healing file system, and RAID 6 B. Checksum, RAID 5, and snapshots C. Compression, NVRAM, and snapshots D. File system verification, snapshots, and RAID 6
Answer: A
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