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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What metadata is stored on a DataNode when a block is written to it?

A) None. Only the block itself is written.
B) Information on the file's location in HDFS.
C) Checksums for the data in the block, as a separate file.
D) Node location of each block belonging to the same namespace.

2. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
B) Fsck
C) Du
D) The map-only checksum utility,
E) Dskchk

3. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the cluster can be determined as the block is written.
B) The block size of files in the Cluster will all be multiples of 64M
C) The block size of files in the cluster will all be the exactly 64MB.
D) The block size of files in the duster will all at least be 64MB.

4. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to run an internal MapReduce job to copy files.
B) Use distcp to copy physical blocks from the source to the target destination in your cluster.
C) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
D) Use distcp to copy HBase table files.
E) Use distcp to copy data between directories inside the same cluster.

5. Which two features does Kerberos security add to a Hadoop cluster?

A) User authentication on all remote procedure calls (RPcs)
B) Root access to the cluster for users hdfs and mapred but non-root acess clients
C) Encryption for data on disk ("at rest")
D) Authentication for user access to the cluster against a central server
E) Encryption on all remote procedure calls (RPCs)

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