What is the primary role of replication in distributed systems?

What is the primary role of replication in distributed systems?

• A. Replication ensures data is moved automatically during failures.
• B. Replication stores copies on a single node.
• C. Replication allows failures to be handled without moving data.
• D. Replication reduces overall data availability.

Answer: (C)

Replication creates redundant copies of data on multiple nodes so the system can keep serving requests even if some nodes fail. With these copies available, failures are handled without needing to move data around or relocate it; you can failover to another replica or read from a different node, preserving availability and resilience. The other options miss the point: moving data during failures isn’t the primary role of replication, storing copies on a single node offers no fault tolerance, and replication is intended to boost, not reduce, data availability.

Replication creates redundant copies of data on multiple nodes so the system can keep serving requests even if some nodes fail. With these copies available, failures are handled without needing to move data around or relocate it; you can failover to another replica or read from a different node, preserving availability and resilience. The other options miss the point: moving data during failures isn’t the primary role of replication, storing copies on a single node offers no fault tolerance, and replication is intended to boost, not reduce, data availability.