Final answer:
The default replication method in HDFS is Triple Copy, which ensures data is replicated across three nodes for fault tolerance and high availability.
Step-by-step explanation:
Under the HDFS (Hadoop Distributed File System) storage model, the default method of replication is Triple Copy. This means that when data is stored in HDFS, it is automatically replicated to three different nodes in the cluster. This replication strategy is designed to provide high availability and fault tolerance. In the event that one or two of the nodes containing the data fail, there are still one or two more copies available from which the data can be retrieved.