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A fully secure Hadoop cluster needs ___________

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A fully secure Hadoop cluster needs ___________

(a) SSH

(b) SSL

(c) Kerberos

(d) REST

The question was asked by my school principal while I was bunking the class.

My query is from Knox with Hadoop in chapter Incubator Projects, Chuckwa, Ambari, Knox and Hadoop Development Tools of Hadoop

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Best answer
Right option is (c) Kerberos

To explain I would say: Kerberos requires a client side library and complex client side configuration.

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