This, along with other data engineer questions for freshers, is a regular feature in data engineer interviews, be ready to tackle it with the approach mentioned below. In Hadoop, replication factor depicts the number of times the framework replicates or duplicates the Data blocks in a system. The default replication factor in Hadoop is 3 which can be manipulated as per the system requirements. The main advantage of the replication process is to ensure data availability. We can configure the replication factor in hdfs-site.xml file which can be less than or more than 3 according to the requirements.