Cloud Storage Systems Questions and Answers

Q: Three of the following reduce cloud storage cost. Which is the odd one out?

Correct answer: enabling cross region replicationCross region replication stores a second copy and pays egress to put it there, so it increases cost - deliberately, in exchange for regional resilience. The other three all reduce it: lifecycle transitions move cold data to cheaper classes, deleting incomplete multipart uploads removes fragments that are billed and invisible, and compression reduces the bytes stored.

Q: Consider the following statements about file storage in cloud.1. It provides a shared filesystem accessible from several instances.2. It is more expensive per gigabyte than object storage.3. It is the cheapest option for storing large archives.

Correct answer: 1 and 2 onlyStatements 1 and 2 are correct: file storage gives a shared POSIX filesystem several instances can mount, and that capability costs several times object storage per gigabyte. Statement 3 is wrong - archives belong in object storage, and in its coldest classes at that. File storage is chosen when applications need filesystem semantics, not when data merely needs keeping.

21.

Three of the following reduce cloud storage cost. Which is the odd one out?

A.enabling cross region replication
B.lifecycle transitions to colder classes
C.deleting incomplete multipart uploads
D.compressing data before upload

Answer: A

Correct answer: enabling cross region replication

Cross region replication stores a second copy and pays egress to put it there, so it increases cost - deliberately, in exchange for regional resilience. The other three all reduce it: lifecycle transitions move cold data to cheaper classes, deleting incomplete multipart uploads removes fragments that are billed and invisible, and compression reduces the bytes stored.

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22.

The dominant cost element for a rarely read archive is usually

A.the charge made for encryption
B.the storage charge itself
C.the charge for retrieval of data
D.the charge made per request

Answer: B

With few reads there are few retrievals to pay for, so the standing storage charge dominates. For a frequently read dataset the balance shifts to retrieval and requests. Few reads means few charges. The balance shifts entirely with access.

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23.

Assertion (A): The cheapest storage class is not always the cheapest overall.
Reason (R): Retrieval charges and minimum durations can exceed the saving on storage.

A.A is true but R is false
B.A is false but R is true
C.Both A and R are true, and R is the correct explanation of A
D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason names the two charges that catch people out. Archive classes bill for retrieval, sometimes substantially, and impose a minimum storage duration so that an object deleted early is billed as though it had stayed. Data read or churned frequently can therefore cost more in an archive class than in a standard one, which is why lifecycle rules must be set from the actual access pattern.

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24.

Arrange the steps of designing a storage tier in order.
1. set lifecycle rules for ageing data
2. characterise the access pattern and retention requirement
3. monitor actual cost against the expectation
4. choose the storage type and class

A.3 - 1 - 4 - 2
B.4 - 2 - 1 - 3
C.2 - 1 - 4 - 3
D.2 - 4 - 1 - 3

Answer: D

The access pattern drives everything else, and monitoring closes the loop where the pattern turns out to differ from what was assumed. Choosing a class before understanding access is the usual error. Monitoring closes the loop at the end.

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25.

A content delivery network reduces storage cost and latency by

A.caching objects near the users
B.compressing the data at the origin
C.replicating the whole store everywhere
D.removing any need for an origin at all

Answer: A

Repeated reads are served from the cache rather than from the origin, cutting both egress and latency. The origin remains authoritative and must still exist. Repeated reads never reach it. Egress and latency both fall.

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26.

Consider the following statements about file storage in cloud.
1. It provides a shared filesystem accessible from several instances.
2. It is more expensive per gigabyte than object storage.
3. It is the cheapest option for storing large archives.

A.All of them
B.1 and 2 only
C.3 only
D.1 only

Answer: B

Correct answer: 1 and 2 only

Statements 1 and 2 are correct: file storage gives a shared POSIX filesystem several instances can mount, and that capability costs several times object storage per gigabyte. Statement 3 is wrong - archives belong in object storage, and in its coldest classes at that. File storage is chosen when applications need filesystem semantics, not when data merely needs keeping.

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27.

State whether the following is true or false.
Instance store volumes persist when the virtual machine is stopped.

A.False only at small scales
B.True
C.False
D.True only at large scales

Answer: C

They are local to the physical host and their contents are lost. They suit scratch and cache data where loss is acceptable, not anything that must survive. The volume is host local. Stopping the machine loses the contents.

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