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Given an NLB configured to balance TCP traffic across three targets, what happens if one target becomes unhealthy?

medium📝 Predict Output Q13 of 15
AWS - Elastic Load Balancing
Given an NLB configured to balance TCP traffic across three targets, what happens if one target becomes unhealthy?
ANLB stops sending traffic to the unhealthy target and continues with healthy ones
BNLB sends traffic evenly to all targets regardless of health
CNLB shuts down until the unhealthy target recovers
DNLB redirects traffic to a backup Application Load Balancer
Step-by-Step Solution
Solution:

  1. Step 1: Understand NLB health checks

    NLB performs health checks and routes traffic only to healthy targets.

  2. Step 2: Analyze behavior on unhealthy target

    If a target is unhealthy, NLB excludes it from routing until it recovers.

  3. Final Answer:

    NLB stops sending traffic to the unhealthy target and continues with healthy ones -> Option A

  4. Quick Check:

    Health checks exclude unhealthy targets [OK]
Quick Trick: NLB routes only to healthy targets [OK]
Common Mistakes:
MISTAKES
  • Assuming NLB sends traffic to unhealthy targets
  • Thinking NLB stops completely on failure
  • Believing NLB redirects to ALB automatically

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