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What happens if you register the same EC2 instance multiple times in a target group?

medium📝 service behavior Q5 of 15
AWS - Elastic Load Balancing
What happens if you register the same EC2 instance multiple times in a target group?
AThe instance receives traffic multiple times as separate targets.
BThe load balancer crashes due to duplicate targets.
COnly one registration is active; duplicates are ignored.
DAWS rejects duplicate registrations and throws an error.
Step-by-Step Solution
Solution:

  1. Step 1: Understand target registration behavior

    AWS does not permit registering the same EC2 instance (or any target) more than once in the same target group.

  2. Step 2: Consequence of duplicate registration attempt

    AWS rejects the request and throws a validation error, such as 'Target ID is already registered for the target group'.

  3. Final Answer:

    AWS rejects duplicate registrations and throws an error. -> Option D

  4. Quick Check:

    Duplicate registration = Rejected with error [OK]
Quick Trick: Duplicate registrations are rejected with error [OK]
Common Mistakes:
MISTAKES
  • Assuming the instance receives traffic multiple times
  • Thinking duplicates are silently ignored
  • Believing it causes load balancer crash

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