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NEW QUESTION: 1
You configure your hadoop cluster with mapreduce V1 (MRv1) along with HDFS high availability (HA) Quorum-based storage. On which nodes should you configure and run your journal node daemon(s) to guarantee a quorum?
A. standby namenode, jobtracker, resourcemanager
B. standby namenode
C. Jobtracker
D. On each datanode
E. Namenode and standby namenode
F. Namenode, standby namenode and jobtracker
G. Namenode
Answer: A
Explanation:
* JournalNode machines - the machines on which you run the JournalNodes. The JournalNode daemon is relatively lightweight, so these daemons may reasonably be collocated on machines with other Hadoop daemons, for example NameNodes, the JobTracker, or the YARN
ResourceManager.
Note: There must be at least 3 JournalNode daemons, since edit log modifications must be written
to a majority of JNs. This will allow the system to tolerate the failure of a single machine.
*In order to deploy an HA cluster, you should prepare the following: / NameNode machines / JournalNode machines
*Quorum-based Storage Quorum-based Storage refers to the HA implementation that uses Quorum Journal Manager (QJM).
In order for the Standby node to keep its state synchronized with the Active node in this implementation, both nodes communicate with a group of separate daemons called JournalNodes. When any namespace modification is performed by the Active node, it durably logs a record of the modification to a majority of these JournalNodes. The Standby node is capable of reading the edits from the JournalNodes, and is constantly watching them for changes to the edit log. As the Standby Node sees the edits, it applies them to its own namespace. In the event of a failover, the Standby will ensure that it has read all of the edits from the JournalNodes before promoting itself to the Active state. This ensures that the namespace state is fully synchronized before a failover occurs.
In order to provide a fast failover, it is also necessary that the Standby node has up-to-date information regarding the location of blocks in the cluster. In order to achieve this, the DataNodes are configured with the location of both NameNodes, and they send block location information and heartbeats to both.
NEW QUESTION: 2
Kerberos depends upon what encryption method?
A. El Gamal cryptography.
B. Secret Key cryptography.
C. Public Key cryptography.
D. Blowfish cryptography.
Answer: B
Explanation:
Kerberos depends on Secret Keys or Symmetric Key cryptography.
Kerberos a third party authentication protocol. It was designed and developed in the mid
1980's by MIT. It is considered open source but is copyrighted and owned by MIT. It relies
on the user's secret keys. The password is used to encrypt and decrypt the keys.
This question asked specifically about encryption methods. Encryption methods can be
SYMMETRIC (or secret key) in which encryption and decryption keys are the same, or
ASYMMETRIC (aka 'Public Key') in which encryption and decryption keys differ.
'Public Key' methods must be asymmetric, to the extent that the decryption key CANNOT
be easily derived from the encryption key. Symmetric keys, however, usually encrypt more
efficiently, so they lend themselves to encrypting large amounts of data. Asymmetric
encryption is often limited to ONLY encrypting a symmetric key and other information that
is needed in order to decrypt a data stream, and the remainder of the encrypted data uses
the symmetric key method for performance reasons. This does not in any way diminish the
security nor the ability to use a public key to encrypt the data, since the symmetric key
method is likely to be even MORE secure than the asymmetric method.
For symmetric key ciphers, there are basically two types: BLOCK CIPHERS, in which a
fixed length block is encrypted, and STREAM CIPHERS, in which the data is encrypted
one 'data unit' (typically 1 byte) at a time, in the same order it was received in.
The following answers are incorrect:
Public Key cryptography. Is incorrect because Kerberos depends on Secret Keys or
Symmetric Key cryptography and not Public Key or Asymmetric Key cryptography.
El Gamal cryptography. Is incorrect because El Gamal is an Asymmetric Key encryption
algorithm.
Blowfish cryptography. Is incorrect because Blowfish is a Symmetric Key encryption
algorithm.
References:
OIG CBK Access Control (pages 181 - 184) AIOv3 Access Control (pages 151 - 155)
Wikipedia http://en.wikipedia.org/wiki/Blowfish_%28cipher%29 ; http://en.wikipedia.org/wiki/El_Gamal http://www.mrp3.com/encrypt.html
NEW QUESTION: 3
All of the following are level 1 processes EXCEPT:
A. enable
B. make
C. source
D. deliver
E. return
Answer: A