1 min lesson
Failover and traffic steering
Explain the practical point behind "Steering lives in two places."
Step 1 of 3
Failover and traffic steeringtested, not theoretical
Steering lives in two places: DNS / global load balancer health checks decide which region is even an option and the edge picks among the healthy ones. The credibility line is whether failover is tested.
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Full explanation
Failover, Step by Step
Interactive diagram. Step through it with the Next and Previous controls below, or Tab to a region to read its detail.
Steering lives in two places - health checks decide which regions are even an option, the edge picks among the healthy ones. The gate is the line that separates a real control from a hope.
If you run two active regions at 60% each, losing one dumps its load onto the survivor and you're instantly at 120% - an outage caused by your own failover. Multi-region resilience only counts if the remaining regions can absorb the dead one's traffic. State that you'd capacity-plan and autoscale for N-1.
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Optional practice
Practice: Failover and traffic steering
QA candidate proposes two active regions each running at 65% utilization for "high availability." What flaw do you point out?