CSA Backup and Disaster Recovery 3

Question 1

Which cloud storage class is most cost-effective for backup data that is rarely accessed but must be retrievable within minutes?

Accepted Answer

Glacier Instant Retrieval (or equivalent infrequent-access tier)

Answer

Infrequent-access tiers with instant retrieval offer low storage costs while still providing milliseconds-to-minutes access times.

Question 2

An administrator discovers that backup jobs have been completing successfully for months, but restores from those backups consistently fail. What is the most likely root cause?

Accepted Answer

Backup verification or integrity testing was never performed

Answer

Backups should be regularly tested via restore drills; a backup that was never verified may be silently corrupted or incomplete.

Question 3

What does 'deduplication' accomplish in a backup system?

Accepted Answer

Eliminates redundant data blocks so identical data is stored only once

Answer

Deduplication identifies and stores only unique data blocks, significantly reducing backup storage requirements.

Question 4

Which disaster recovery metric defines the maximum age of data that can be lost during a recovery event?

Accepted Answer

RPO

Answer

RPO (Recovery Point Objective) specifies how far back in time recovery data can go, i.e., the maximum tolerable data loss window.

Question 5

A system administrator implements replication where data is written to the secondary site before the primary site confirms the write to the application. What type of replication is this?

Accepted Answer

Synchronous replication

Answer

Synchronous replication requires the secondary site to acknowledge the write before the primary confirms it, ensuring zero data loss but adding latency.

(CSA) Certified System Administrator Practice Test

(CSA) Certified System Administrator Practice Test

CSA Backup and Disaster Recovery 3