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Given this Route 53 failover setup: Primary health check fails, what happens to user traffic?

medium📝 service behavior Q13 of 15
AWS - Route 53
Given this Route 53 failover setup: Primary health check fails, what happens to user traffic?
Primary: IP 10.0.0.1 (health check enabled)
Secondary: IP 10.0.0.2 (backup)
ATraffic switches to secondary IP 10.0.0.2
BTraffic is split evenly between primary and secondary
CTraffic is blocked until primary recovers
DTraffic continues to primary IP 10.0.0.1
Step-by-Step Solution
Solution:
  1. Step 1: Understand health check failure effect

    If the primary health check fails, Route 53 detects the primary is unhealthy.
  2. Step 2: Apply failover routing behavior

    Failover routing sends traffic to the secondary (backup) IP when primary is unhealthy.
  3. Final Answer:

    Traffic switches to secondary IP 10.0.0.2 -> Option A
  4. Quick Check:

    Primary down = traffic to backup [OK]
Quick Trick: Failover sends traffic to backup if primary fails health check [OK]
Common Mistakes:
  • Assuming traffic stays on primary despite failure
  • Thinking traffic is blocked during failover
  • Believing traffic splits evenly without weighting

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