Explain replication in Cassandra.

beginner

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Replication provides fault tolerance:

Replication Factor (RF): Number of copies of each piece of data
Replication Strategy: Determines which nodes get replicas
- SimpleStrategy: For single datacenter
- NetworkTopologyStrategy: For multiple datacenters
Coordinator Node: Any node can coordinate a request
Replica Nodes: Nodes that store copies of the data

Example: RF=3 means each piece of data is stored on 3 different nodes.

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