CompTIA Cloud+ Practice Test

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What type of data replication ensures that changes are made simultaneously in both primary and secondary systems?

Synchronous replication
Asynchronous replication
Volume sync
Mirroring

The correct answer is: Synchronous replication

Synchronous replication is a method where data changes are committed to both the primary and secondary systems at the same time. This means that, when an update occurs in the primary system, the same update is immediately replicated to the secondary system, ensuring that both locations have the exact same data at any given moment. This approach is crucial for scenarios where data consistency is vital, such as in financial transactions or critical applications that cannot afford any data loss or discrepancies. In scenarios where data must be consistent between two locations and where real-time updates are necessary, synchronous replication is highly effective. However, it can introduce latency since the primary system must wait for confirmation that the secondary system has also received the data before it proceeds with further operations. The other options describe different replication strategies. While asynchronous replication allows for changes to be made at the primary site without immediately impacting the secondary site, volume sync and mirroring are more specific practices that may not inherently require simultaneous updates or do not prioritize synchronous data integrity in the same way. Thus, synchronous replication uniquely ensures that real-time consistency is maintained across both systems.