Cassandra Practice Test

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Which strategy is used to set up replication factors for multiple data centers in Cassandra?

ReplicationFactorStrategy
NetworkTopologyStrategy
MultiDCStrategy
DatacenterReplicationStrategy

The correct answer is: NetworkTopologyStrategy

In Cassandra, the correct approach for setting up replication factors across multiple data centers is through NetworkTopologyStrategy. This strategy allows you to specify different replication factors for each data center in your cluster, which is crucial for ensuring that your data is replicated appropriately in environments that span multiple locations. When using NetworkTopologyStrategy, you can define how many replicas of your data should be stored in each data center, allowing for high availability and resilience against data center failures. This flexibility supports scenarios where you may want to have more replicas in one data center than another, depending on your specific requirements, such as user density or performance needs. The other options mentioned do not accurately reflect the method for handling replication across multiple data centers. For instance, ReplicationFactorStrategy does not exist in Cassandra terminology, while MultiDCStrategy and DatacenterReplicationStrategy are not commonly recognized or used terms within the Cassandra framework. Thus, NetworkTopologyStrategy stands out as the correct and widely accepted method for managing replication across multiple data centers.