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You set up an ALB with a listener on port 80 but forget to configure any target groups. What issue will you encounter?

medium📝 Debug Q6 of 15
AWS - Elastic Load Balancing
You set up an ALB with a listener on port 80 but forget to configure any target groups. What issue will you encounter?
AALB will not forward any traffic and return 503 errors
BALB will forward traffic to default targets automatically
CALB will route traffic based on URL paths without targets
DALB will forward traffic to NLB targets
Step-by-Step Solution
Solution:

  1. Step 1: Check ALB listener requirements

    ALB listeners must have at least one target group to forward traffic.

  2. Step 2: Consequence of missing target groups

    Without targets, ALB returns HTTP 503 Service Unavailable errors.

  3. Final Answer:

    ALB will not forward any traffic and return 503 errors -> Option A

  4. Quick Check:

    ALB needs targets or returns 503 [OK]
Quick Trick: ALB needs targets; no targets = 503 errors [OK]
Common Mistakes:
  • Assuming ALB forwards without targets
  • Expecting default targets
  • Confusing ALB with NLB behavior

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