Exam Professional Cloud Architect All Questions

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Exam Professional Cloud Architect topic 1 question 152 discussion

Actual exam question from Google's Professional Cloud Architect

Question #: 152
Topic #: 1

[All Professional Cloud Architect Questions]

Your company is planning to upload several important files to Cloud Storage. After the upload is completed, they want to verify that the uploaded content is identical to what they have on-premises. You want to minimize the cost and effort of performing this check. What should you do?

A. 1. Use Linux shasum to compute a digest of files you want to upload. 2. Use gsutil -m to upload all the files to Cloud Storage. 3. Use gsutil cp to download the uploaded files. 4. Use Linux shasum to compute a digest of the downloaded files. 5. Compare the hashes.
B. 1. Use gsutil -m to upload the files to Cloud Storage. 2. Develop a custom Java application that computes CRC32C hashes. 3. Use gsutil ls -L gs://[YOUR_BUCKET_NAME] to collect CRC32C hashes of the uploaded files. 4. Compare the hashes.
C. 1. Use gsutil -m to upload all the files to Cloud Storage. 2. Use gsutil cp to download the uploaded files. 3. Use Linux diff to compare the content of the files.
D. 1. Use gsutil -m to upload the files to Cloud Storage. 2. Use gsutil hash -c FILE_NAME to generate CRC32C hashes of all on-premises files. 3. Use gsutil ls -L gs://[YOUR_BUCKET_NAME] to collect CRC32C hashes of the uploaded files. 4. Compare the hashes.

Show Suggested Answer

Suggested Answer: D 🗳️

by pr2web at Aug. 23, 2021, 7:56 p.m.

Comments

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vladik820

Highly Voted 2 years, 11 months ago

D is ok . https://cloud.google.com/storage/docs/gsutil/commands/hash

upvoted 39 times

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Bahubali1988

Highly Voted 1 year, 11 months ago

Seems most of the questions are having wrong answers.. If there is no discussion , its highly difficult to get the right answers.

upvoted 17 times

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mahi_h

Most Recent 2 months, 2 weeks ago

Selected Answer: D

I don't know why everyone keeps pointing to below doc: https://cloud.google.com/storage/docs/gsutil/commands/hash could not find any mention of hashes OR rather google might have updated the doc. However, below document well explains concept of CRC32C checksum and hashes: https://cloud.google.com/storage/docs/data-validation

upvoted 1 times

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plumbig11

7 months, 2 weeks ago

Selected Answer: D

Use gsutil hash -c FILE_NAME to generate CRC32C hashes, you cannot forget to generate the hashes

upvoted 1 times

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tamj123

10 months ago

Selected Answer: D

created hash and compare after is way to go.

upvoted 2 times

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RaviRS

11 months, 2 weeks ago

Selected Answer: D

I am losing faith on the answers given... Option C is downright absurd.

upvoted 1 times

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Jerar

1 year ago

Selected Answer: D

https://cloud.google.com/storage/docs/gsutil/commands/hash Calculate hashes on local files, which can be used to compare with gsutil ls -L output. -c Calculate a CRC32c hash for the specified files.

upvoted 1 times

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BiddlyBdoyng

1 year, 2 months ago

Downloading before hashing cannot be right. The upload might be fine but if the download could corrupt

upvoted 1 times

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surajkrishnamurthy

1 year, 8 months ago

Selected Answer: D

D is the correct answer

upvoted 2 times

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megumin

1 year, 9 months ago

Selected Answer: D

D is ok

upvoted 1 times

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Nuwan_SriLanka

1 year, 9 months ago

Selected Answer: D

Calculate hashes on local files, which can be used to compare with gsutil ls -L output. If a specific hash option is not provided, this command calculates all gsutil-supported hashes for the files. Note that gsutil automatically performs hash validation when uploading or downloading files, so this command is only needed if you want to write a script that separately checks the hash. If you calculate a CRC32c hash for files without a precompiled crcmod installation, hashing will be very slow. See gsutil help crcmod for details. https://cloud.google.com/storage/docs/gsutil/commands/hash

upvoted 5 times

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Mahmoud_E

1 year, 10 months ago

Selected Answer: D

D is the right answer per this doc https://cloud.google.com/storage/docs/gsutil/commands/hash

upvoted 1 times

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Jay_Krish

1 year, 11 months ago

Selected Answer: C

All those who answered D.. can one of you if you're genuine tell how is this even possible - The second step in the option D? 2. Use gsutil hash -c FILE_NAME to generate CRC32C hashes of all on-premises files.

upvoted 2 times

Jay_Krish

1 year, 11 months ago

Reading again it's probably not C because it talks about Linux commands but what if the environment is Windows.. but I still have my doubts on D if someone could clarify?

upvoted 2 times

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binpan

2 years, 1 month ago

Correct Answer C A- digest comparison does not gurantee file contents are same. moreover lot of extra steps. - not correct B - custom Java code - lot of effort - not correct D - gs util cannot be used for creating hash for on prem files stored on on prem filestore/database. Not correct C - not the best option but right answer for the options available.

upvoted 2 times

luamail

1 year, 10 months ago

dowload file has cost, C no is a option

upvoted 1 times

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SIMMEAT

2 years ago

there is a hash options in gsutil for local files. https://cloud.google.com/storage/docs/gsutil/commands/hash

upvoted 2 times

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kaito789

2 years ago

D is correct. you only need gs util to generate hash for cloud storage. you would use your own utility to create ash for on prem and then compare the two.

upvoted 1 times

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