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What is the function of a continuous data protection (CDP) appliance?
Answer : D
A CDP appliance sits in the data path and:
Intercepts all writes to the production volume.
Splits each write into two copies: one goes to the production volume, the other to the replica volume.
Maintains a journal for point-in-time recovery.
Option A/B/C: These are aspects of replication, but CDP's primary function is real-time interception and splitting of writes.
When troubleshooting a virtual machine, which file is most likely to provide a detailed history of the VM's behavior?
Answer : B
Log files record events and messages related to the operations of a virtual machine. They provide detailed information about the VM's behavior, errors, and system messages, which are crucial for troubleshooting.
What is the main advantage of a write-through operation in cache write I/O operations?
Answer : C
In write-through caching, data is written simultaneously to both the cache and the underlying disk. This ensures data integrity because the write is not acknowledged until it's safely written to the disk.
Write-back caching offers reduced latency but increases risk of data loss if cache is lost.
Write-through trades speed for security, offering enhanced data security and reducing the risk of data loss during power failures.
What is a key challenge in managing the variety aspects of Big Data?
Answer : C
Big Data's 'variety' refers to the challenge of integrating different data types (structured, semi-structured, unstructured) from various sources.
The key challenge is to combine and manage this data cost-effectively, ensuring analytics systems can process it seamlessly.
Generating real-time data is about velocity, not variety.
Storing data over years is about volume.
Reducing volume is more about data management, not variety.
A company wants to perform a full backup of its critical data. What is the main advantage of this approach?
Answer : A
A full backup captures all data each time it runs.
Main advantage: Fastest recovery because no additional backup sets (like incrementals or differentials) need to be combined.
Disadvantage: Takes more backup time and requires more storage space compared to incremental backups.
Option B: Full backups have a higher impact because of the time and bandwidth required.
Option C: Full backups consume the most storage.
Option D: Full backups are not the fastest in terms of backup window -- they are the fastest in recovery.
