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CCA175 Certification What is a Gateway node

If you have appeared for CCA175 Cloudera Hadoop Developer and Spark certification, then can you please let me know answer for following questions 

1. What is gateway node ?

2. What would be JDBC URL for mysql database.

3. Is Spark question can be answered in language of our choice?

4. Will internet access would be available during exam?

5. What happen if i accidentally delete question data provided on cluster ?

6. I am about to complete all the questions tasks provided by www.HadoopExam.com

CCA175 material link : http://www.hadoopexam.com/cloudera_certification/cca175/cca_175_hadoop_cloudera_spark_certification_questions_dumps_practice_test.html

CCA175 Training Link : http://hadoopexam.com/index.html/#hadoop-training

Spark Training (Excellent training) : http://www.hadoopexam.com/spark/training/Apache_Spark_professional_training_developer_certification_exam_dumps.html

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