Question 15: Select all correct statements which applies to seed nodes

1. In multiple data-center clusters, the seed list should include at least one node from each data center (replication group).
2. More than a single seed node per data center is recommended for fault tolerance
3. Making every node a seed node is recommended for fault tolerance
4. It is recommended to use a small seed list (approximately three nodes per data center).
5. A, B, C
6. B, C, D
7. A, C, D
8. A, B, D

Correct Answer: 4

Explanation: In multiple data-center clusters, the seed list should include at least one node from each data center (replication group). More than a single seed node per data center is recommended for fault tolerance. Otherwise, gossip has to communicate with another data center when bootstrapping a node.

Making every node a seed node is not recommended because of increased maintenance and reduced gossip performance. Gossip optimization is not critical, but it is recommended to use a small seed list (approximately three nodes per data center).