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NEW QUESTION: 1
You have created an on-box script and want to deploy it on your device. You plan to place it in a directory where the Junos OS can execute it.
Which two privilege levels would be used to accomplish this task? (Choose two)
A. super-user
B. operator
C. root
D. read-only
Answer: A,C
Explanation:
Explanation/Reference:
Reference: https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/junos-script- automation-script-storing-enabling.html
NEW QUESTION: 2
Which statement below BEST describes non-functional testing?
A. The process of testing to determine the compliance of a system to coding standards.
B. Testing system attributes, such as usability, reliability or maintainability.
C. Testing without reference to the internal structure of a system.
D. The process of testing an integrated system to verify that it meets specified requirements.
Answer: D
NEW QUESTION: 3
ポート80を除く宛先ポート範囲が22〜433のTCPトラフィックのみを許可するアクセス制御リストはどれですか。
A. tcp any any ne 80を拒否します
tcp任意の範囲を許可22 443
B. tcp any any eq 80を拒否
tcp any any gt 21 it 444を許可する
C. 22 443の任意の範囲のTCPを許可
tcp any any eq 80を拒否
D. tcp any any ne 80を許可します
Answer: B
NEW QUESTION: 4
How does the NameNode detect that a DataNode has failed?
A. When the NameNode fails to receive periodic heartbeats from the DataNode, it considers the DataNode as failed.
B. The NameNode does not need to know that a DataNode has failed.
C. The NameNode periodically pings the datanode. If the DataNode does not respond, the NameNode considers the DataNode as failed.
D. When HDFS starts up, the NameNode tries to communicate with the DataNode and considers the DataNode as failed if it does not respond.
Answer: A
Explanation:
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.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,How NameNode Handles data node failures?
