Explain the Need and Benefits of Deduplication DATA-PROTECTION-MANAGEMENT-FOUNDATIONS Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A company is backing up a large database to a deduplication appliance. The backup completes quickly, but the restore of a single table takes longer than expected. What is the most likely reason?

   • AThe backup software is not optimized for the deduplication appliance.
   • BThe backup was not compressed, so the restore reads more data.
   • CThe restore process is using a slow network connection.
   • DThe table's data is spread across many non-contiguous blocks, requiring more I/O to reassemble.
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2. 17application · medium

   A company performs nightly full backups of 10 TB of file servers to a deduplication appliance. The backup window is limited to 4 hours. After enabling deduplication, the backup completes in 2 hours. What is the primary reason for this improvement?

   • ADeduplication compresses the data, making it faster to read from the source.
   • BDeduplication reduces the amount of data written to the backup target, so less time is spent writing data.
   • CDeduplication allows multiple backups to run concurrently.
   • DDeduplication increases the network bandwidth available for backups.
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4. 18foundation · easy

   In a deduplication system, what happens to a data block that is identical to a block already stored?

   • AIt is compressed and then stored alongside the original
   • BIt is stored again in a different location for redundancy
   • CIt is deleted and the backup job fails
   • DIt is replaced with a reference pointing to the existing block
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5. 19expert · hard

   A company is considering implementing deduplication to reduce backup storage costs. They have a mix of data: some highly redundant (e.g., virtual machine images) and some already compressed (e.g., media files). They want to maximize storage savings. What is the best approach?

   • AEnable deduplication for all data types, as it will reduce storage for all.
   • BDisable deduplication for the already compressed data to avoid wasting processing resources.
   • CUse compression only, as it is more effective than deduplication for all data.
   • DEnable deduplication only for the highly redundant data, and use compression for the already compressed data.
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6. 20application · medium

   A backup administrator notices that a full backup of a database server consumes the same amount of storage as the previous full backup, even though the database has grown by 20%. The backup software is configured to perform deduplication. What is the most likely reason for this observation?

   • AThe backup is using compression instead of deduplication.
   • BThe new backup contains many blocks identical to those in the previous backup, so deduplication stores only the changed blocks.
   • CThe backup target is a virtual tape library that does not support deduplication.
   • DDeduplication is not working because the backup software is not licensed for it.
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