Exam CISSP topic 1 question 10 discussion

D is the only answer choice that makes sense with the excess data

"D" it is. Data deduplication is a process that eliminates excessive copies of data and significantly decreases storage capacity requirements. Deduplication can be run as an inline process as the data is being written into the storage system and/or as a background process to eliminate duplicates after the data is written to disk. https://www.netapp.com/data-management/what-is-data-deduplication/#:~:text=Data%20deduplication%20is%20a%20process,data%20is%20written%20to%20disk.

Answer is D: The important part of the question here is "Redundant and unusable data".

The problem described is "a large amount of redundant and unusable data" filling up storage. Deduplication is a storage optimization technique that eliminates redundant copies of data by storing only unique instances of data blocks or files and replacing duplicates with pointers to the original. This directly addresses storage inefficiency caused by redundant data, reducing overall storage consumption on the SAN. 📌 Why the others aren’t ideal: A. Compression → Reduces the size of data but doesn’t remove redundancy. It works on individual files or data streams, not across multiple copies of the same file. B. Caching → Temporarily stores frequently accessed data for performance, not for reducing storage footprint. C. Replication → Actually increases storage use by copying data to other locations for redundancy and availability — the opposite of what’s needed here.

D is more accurate

the question mentions "redundant" which indicates the answer will be D

The data deduplication process systematically eliminates redundant copies of data and files, which can help reduce storage costs and improve version control. In an era when every device generates data and entire organizations share files, data deduplication is a vital part of IT operations.

I need to slow down and read it. it is De-duplication not Duplication, Jesus what a trap.

D is correct answer. Redundant can mean multiple (think redundant systems) so if you have multiple versions of the data then dedup would reduce these copies to one main and multiple stubs. Yes there would be a hit on CPU performance once dedup is run for the first time, however long term this speeds up space saving when new (redundant) data is added. Compression would reference each redundant bit/byte and have pointers to each, filling up the master index record and adding processing overhead each time data was added, searched for or retrieved.

Assuming you have a very large file on your desktop and is occupying much storage space, you can zip up the folder and the size of the file will reduce. What dose that mean? you are compressing the file. That same logic can be applied to this quest. Thus, the correct and is A. Compression

D is the best answer Deduplication is the best solution for managing excess data, even if it's not just duplicates. It helps remove redundant and unneeded data efficiently.

Deduplication doesnt address unusable data.. so it has to be compression, A

D is pretty much the "text book" answer for this question.

Deduplication is effective in organizations that have a lot of redundant data, such as backup systems that have several versions of the same file. Compression is effective in decreasing the size of unique files, such as images, videos, and databases

Deduplication is effective in organizations that have a lot of redundant data, such as backup systems that have several versions of the same file. Compression is effective in decreasing the size of unique files, such as images, videos, and databases

I say the answer is A. The question isn't talking about getting rid of the data, and 9 times out of 10, no one is going to go through large amounts of data to see what's a duplicate. Not to mention, you wouldn't know what to keep or delete. A "Compression" is the simplest answer.

D is the answer. Although both A and D answer look similar. This is simple explanation for both answers. A storage area network (SAN) or storage network is a computer network which provides access to consolidated, block-level data storage. deduplication commonly occurs at the block level; however, compression generally occurs at the file level. Now the difference is that deduplication occurs at the block level according to the question while compression occurs at the file level. so answer is Deduplication.