Certified Cloud Security Professional (CCSP)Cloud Data SecurityEasy
A cloud provider offers a storage service that automatically replicates data across multiple availability zones within a single region. This ensures high availability and durability in case of a localized outage. Which data replication strategy is the provider employing?
- ASynchronous Replication
- BAsynchronous Replication
- CCross-Region Replication
- DGeo-Redundancy
Show answer & explanationAnswer & explanation
Correct answer: A. Synchronous Replication
Synchronous replication ensures that data is written to multiple locations simultaneously before the write operation is acknowledged as complete. This is typical for high availability within a region or availability zones.
Why the other options are wrong
- B. Asynchronous replication acknowledges the write before all replicas are updated, leading to potential data loss in a failover scenario, which is not the primary mechanism for high durability within a single region's availability zones.
- C. Cross-Region Replication involves replicating data between different geographical regions, not just within availability zones of a single region.
- D. Geo-Redundancy is a broader term that implies replication across geographically distant locations, which could be cross-region, but the question specifies within a single region's availability zones.
Synchronous Replication
A data replication strategy where data is written to both the primary and secondary locations simultaneously, and the write operation is not considered complete until both writes are confirmed. This ensures high data consistency and zero data loss in case of a primary failure.
- Writes to primary and secondary simultaneously.
- Acknowledges write only after both locations confirm.
- Ensures high consistency and zero RPO (Recovery Point Objective).
Memory trick: Sync for Safety, Async for Speed.