You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?

Question

Options

• ASwitchover needs to be done manually
• BFailover happens automatically
• CSwitchover happens automatically
• DFailover needs to be done manually

• A
  6% (2)
• B
  91% (30)
• D
  3% (1)

Explanation

MongoDB replica sets are designed with automatic failover built in: when the primary node becomes unavailable, the remaining secondary nodes hold an election and automatically promote a new primary - no human intervention required.

Why the distractors are wrong:

• A & C (Switchover): A switchover is a planned, manual transition between nodes (e.g., for maintenance). The question describes an unplanned failure, so "switchover" is the wrong term entirely.
• D (Manual failover): This contradicts MongoDB's core design goal - the replica set's election protocol exists precisely to eliminate the need for manual intervention during failures.

Memory tip: Think of it this way - Failover = Fast and Fully automatic (MongoDB handles it). Switchover = you Switch it yourself. The key word in the question is failure, which maps to failover, and MongoDB replica sets make failover automatic.

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