Pure Storage Data Storage Associate (DSA) Certification Exam
| 200 Practice Questions & Detailed Answers with Rationales
| Latest Update | A+ Guide
DOMAIN I: STORAGE FUNDAMENTALS (Questions 1–50)
Question 1
What is the primary advantage of allflash storage over traditional spinningdisk (HDD) arrays?
A) Lower upfront cost per raw terabyte
B) Significantly lower latency and higher IOPS
C) Higher physical capacity per drive
D) No need for RAID protection
Answer: B) Significantly lower latency and higher IOPS
Rationale: Flash media has no mechanical moving parts, enabling microsecondlevel latency and
dramatically higher IOPS compared to HDDs, which are limited by rotational latency and seek times.
Question 2
Which data reduction technique identifies and eliminates duplicate data blocks, storing only a single
instance of each unique block?
A) Compression
B) Deduplication
C) Encryption
D) Thick provisioning
,Answer: B) Deduplication
Rationale: Deduplication identifies redundant data blocks and stores only a single instance of each
unique block, significantly reducing storage capacity requirements.
Question 3
What is the maximum data reduction ratio commonly associated with Pure Storage systems?
A) 5:1
B) 8:1
C) 10:1
D) 20:1
Answer: C) 10:1
Rationale: Pure Storage systems commonly achieve a maximum data reduction ratio of 10:1 through a
combination of inline deduplication, compression, and thin provisioning.
Question 4
Which RAID level provides striping with distributed parity, offering a good balance of performance and
fault tolerance with the ability to withstand a single drive failure?
A) RAID 0
B) RAID 1
C) RAID 5
,D) RAID 6
Answer: C) RAID 5
Rationale: RAID 5 uses blocklevel striping with distributed parity, allowing recovery from a single drive
failure while maintaining good read performance. RAID 6 can tolerate two failures but has higher parity
overhead.
Question 5
What is erasure coding in data storage?
A) A method of encrypting data for security
B) A method of data protection that breaks data into fragments and distributes them
C) A method of compressing data for storage
D) A method of deleting duplicate data
Answer: B) A method of data protection that breaks data into fragments and distributes them
Rationale: Erasure coding breaks data into fragments, expands and encodes it with redundant data, and
distributes it across storage nodes. It provides fault tolerance similar to RAID but is more flexible in
distributed systems.
Question 6
Which storage protocol is commonly used for blocklevel storage access over an IP network?
A) NFS
, B) SMB
C) iSCSI
D) FTP
Answer: C) iSCSI
Rationale: iSCSI (Internet Small Computer System Interface) transports SCSI commands over IP
networks, providing blocklevel storage access. NFS and SMB are filelevel protocols.
Question 7
What is the difference between inline and postprocess deduplication?
A) Inline occurs after data is written; postprocess occurs during write
B) Inline occurs during write; postprocess occurs after data is written
C) Both occur simultaneously
D) Neither is used in modern storage
Answer: B) Inline occurs during write; postprocess occurs after data is written
Rationale: Inline deduplication processes data as it is being written, reducing capacity requirements
immediately but potentially impacting performance. Postprocess deduplication writes data first then
deduplicates later, reducing performance impact but temporarily using more capacity.
Question 8
Which storage type provides access to data as files organized in a hierarchical directory structure?
| 200 Practice Questions & Detailed Answers with Rationales
| Latest Update | A+ Guide
DOMAIN I: STORAGE FUNDAMENTALS (Questions 1–50)
Question 1
What is the primary advantage of allflash storage over traditional spinningdisk (HDD) arrays?
A) Lower upfront cost per raw terabyte
B) Significantly lower latency and higher IOPS
C) Higher physical capacity per drive
D) No need for RAID protection
Answer: B) Significantly lower latency and higher IOPS
Rationale: Flash media has no mechanical moving parts, enabling microsecondlevel latency and
dramatically higher IOPS compared to HDDs, which are limited by rotational latency and seek times.
Question 2
Which data reduction technique identifies and eliminates duplicate data blocks, storing only a single
instance of each unique block?
A) Compression
B) Deduplication
C) Encryption
D) Thick provisioning
,Answer: B) Deduplication
Rationale: Deduplication identifies redundant data blocks and stores only a single instance of each
unique block, significantly reducing storage capacity requirements.
Question 3
What is the maximum data reduction ratio commonly associated with Pure Storage systems?
A) 5:1
B) 8:1
C) 10:1
D) 20:1
Answer: C) 10:1
Rationale: Pure Storage systems commonly achieve a maximum data reduction ratio of 10:1 through a
combination of inline deduplication, compression, and thin provisioning.
Question 4
Which RAID level provides striping with distributed parity, offering a good balance of performance and
fault tolerance with the ability to withstand a single drive failure?
A) RAID 0
B) RAID 1
C) RAID 5
,D) RAID 6
Answer: C) RAID 5
Rationale: RAID 5 uses blocklevel striping with distributed parity, allowing recovery from a single drive
failure while maintaining good read performance. RAID 6 can tolerate two failures but has higher parity
overhead.
Question 5
What is erasure coding in data storage?
A) A method of encrypting data for security
B) A method of data protection that breaks data into fragments and distributes them
C) A method of compressing data for storage
D) A method of deleting duplicate data
Answer: B) A method of data protection that breaks data into fragments and distributes them
Rationale: Erasure coding breaks data into fragments, expands and encodes it with redundant data, and
distributes it across storage nodes. It provides fault tolerance similar to RAID but is more flexible in
distributed systems.
Question 6
Which storage protocol is commonly used for blocklevel storage access over an IP network?
A) NFS
, B) SMB
C) iSCSI
D) FTP
Answer: C) iSCSI
Rationale: iSCSI (Internet Small Computer System Interface) transports SCSI commands over IP
networks, providing blocklevel storage access. NFS and SMB are filelevel protocols.
Question 7
What is the difference between inline and postprocess deduplication?
A) Inline occurs after data is written; postprocess occurs during write
B) Inline occurs during write; postprocess occurs after data is written
C) Both occur simultaneously
D) Neither is used in modern storage
Answer: B) Inline occurs during write; postprocess occurs after data is written
Rationale: Inline deduplication processes data as it is being written, reducing capacity requirements
immediately but potentially impacting performance. Postprocess deduplication writes data first then
deduplicates later, reducing performance impact but temporarily using more capacity.
Question 8
Which storage type provides access to data as files organized in a hierarchical directory structure?
