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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) Node Manager
B) NameNode
C) Application Manager
D) DataNode
E) Resource Manager
F) Secondary NameNode

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

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

3. What four functions do scheduling algorithms perform on hadoop cluster?

A) Reduce the total amount of computation necessary to complete a job.
B) Allow multiple users to share clusters in a predictable policy-guided manner
C) Reduce the job latencies in environment with multiple jobs of different sizes
D) Run jobs at periodic times of the day
E) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
F) support the implementation of service-level agreements for multiple cluster users
G) Ensure data locality by ordering map tasks so that they run on data local maps slots

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

5. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 100TB
B) Approximately 33 TB
C) Approximately 10TB
D) Approximately 25TB

Solutions: