Questions and Answers: 166
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NEW QUESTION: 1
What is used to hide data from unauthorized users by allowing a relation in a database to contain multiple tuples with the same primary keys with each instance distinguished by a security level?
A. Polyinstantiation
B. Cell suppression
C. Noise and perturbation
D. Data mining
Answer: A
Explanation:
Polyinstantiation enables a relation to contain multiple tuples with the same primary keys with each instance distinguished by a security level. Instead of just restricting access, another set of data is created to fool the lower-level subjects into thinking that the information actually means something else. Data mining is the process of extracting and processing the information held in a data warehouse into something useful. Cell suppression is a technique used to hide specific cells that contain information that could be used in inference attacks. Noise and perturbation is a technique of inserting bogus data to misdirect an attacker. Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter 11: Application and System Development (page 727).
NEW QUESTION: 2
What action occurs automatically on a cluster when a DataNode is marked as dead?
A. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
B. The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
C. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
D. The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
Answer: C
Explanation:
How NameNode Handles data node failures?
NameNode periodically receives a Heartbeat and a Blockreport from each of the DataNodes in the
cluster. Receipt of a Heartbeat implies that the DataNode is functioning properly. A Blockreport
contains a list of all blocks on a DataNode. When NameNode notices that it has not recieved a
hearbeat message from a data node after a certain amount of time, the data node is marked as
dead. Since blocks will be under replicated the system begins replicating the blocks that were
stored on the dead datanode. The NameNode Orchestrates the replication of data blocks from one
datanode to another. The replication data transfer happens directly between datanodes and the
data never passes through the namenode.
Note: If the Name Node stops receiving heartbeats from a Data Node it presumes it to be dead
and any data it had to be gone as well. Based on the block reports it had been receiving from the
dead node, the Name Node knows which copies of blocks died along with the node and can make
the decision to re-replicate those blocks to other Data Nodes. It will also consult the Rack
Awareness data in order to maintain thetwo copies in one rack, one copy in another rackreplica
rule when deciding which Data Node should receive a new copy of the blocks.
Reference: 24 Interview Questions & Answers for Hadoop MapReduce developers, How
NameNode Handles data node failures'
NEW QUESTION: 3
DRAG DROP
Answer:
Explanation:
Explanation:
Box 1: Run a site collection health check. Box 2: Perform a site collection upgrade. Box 3: Verify that the upgrade was successful and the site works as expected.
Note:
* To upgrade a site collection, site collection administrators complete the following steps:
1.Run the site collection health checks to verify the site is ready to upgrade.
2.Create an upgrade evaluation site to preview the differences between versions. (Optional)
3.Upgrade the site collection.
4.Verify that upgrade was successful and the site works as expected.
* After a server farm administrator has upgraded the databases, site collection administrators can upgrade individual site collections. When site collection administrators first browse to their sites after the database has been upgraded, a notification bar at the top of the site indicates that their sites can be upgraded. The choices are to Start now or Remind me later. Start now begins the site collection upgrade process.