Question 18: You are designing Cassandra cluster, and you have been asked to span cluster in Geneva, Nevada and Hyderabad. You can configure consistency level of LOCAL_QUORUM or ONE.

The two primary considerations are

(1) being able to satisfy reads locally, without incurring cross data-center latency, and

(2) failure scenarios :

Which is the best strategy to configure replications.

1. Two replicas in each data center e.g. 2 copy in each DC Geneva, Nevada and Hyderabad
2. Three replicas in each data center e.g. 2 copy in each DC Geneva, Nevada and Hyderabad
3. One replica in each data center e.g. 1 copy in each DC Geneva, Nevada and Hyderabad
4. You can have three replicas in one data center e.g. Geneva and single replica in either Nevada and Hyderabad

Correct Answer : ?

Explanation : Check Here For Detailed Explanation