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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes can contain any amount of disk space
B) The new nodes must all contain 4 x 2TB hard drives
C) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
D) The new nodes cannot contain more than 8TB of disk space

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

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

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode requires more memory but less disk capacity.
B) The NameNode requires less memory and fewer number of disk drives than the DataNodes.
C) The NameNode and DataNodes should have the same hardware configuration.
D) The NameNode requires more memory and no disk drives.
E) The NameNode requires more memory and requires greater disk capacity than the DataNodes.

4. You have a cluster running with the FIFO scheduler enabled. You submit a large job A to the
cluster which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) When a job is submitted, all tasks belonging to that job are scheduled.
B) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
C) The order of execution of tasks within a job may vary.
D) Since job B needs only a few tasks, if might finish before job A completes.

5. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
B) One copy of the block is written to a node in each of three racks
C) All three of the block are written to nodes on the same rack
D) Because there are seven racks the block is written to a node on each rack

Solutions: