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HDFS, by default, replicates each data block _____ times on different nodes and on at least ____ racks.

a) 3, 2
b) 1, 2
c) 2, 3
d) All of the mentioned

Answer: a
Explanation: HDFS has a simple yet robust architecture that was explicitly designed for data reliability in the face of faults and failures in disks, nodes and networks.

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