Microsoft Azure Architect Technologies (AZ-300) Practice Exam

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Which replication type ensures data availability within a single data center?

Zonal replication
Local replication
Geo-replication
Regional replication

The correct answer is: Local replication

Local replication is focused on ensuring data availability within a single data center. This replication method typically involves maintaining multiple copies of data across different storage devices or clusters within the same location. By doing so, it provides a robust mechanism to avoid data loss in the event of hardware failures, ensuring that the applications running within the data center can continue to access the data without interruption. In a local replication setup, the data is accessible quickly since it remains within the confines of the same data center, minimizing latency and enhancing performance for applications that depend on real-time data access. This method is particularly beneficial for workloads that require high availability and swift recovery solutions, as it simplifies the management of backups and restores. Other replication options like zonal replication, geo-replication, and regional replication serve different purposes. Zonal replication may manage data across multiple zones, providing some level of redundancy within a cloud provider. Geo-replication is geared towards maintaining data consistency and availability across different geographical locations, which is vital for disaster recovery but introduces additional latency. Regional replication spreads data across multiple data centers within a given region but does not necessarily confine itself to a single data center. Thus, for ensuring data availability strictly within one data center, local replication is the most appropriate choice.