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You configure an NLB with TCP listeners on port 443 and enable proxy protocol. What is the expected behavior when clients connect?

medium📝 service behavior Q4 of 15
AWS - Elastic Load Balancing
You configure an NLB with TCP listeners on port 443 and enable proxy protocol. What is the expected behavior when clients connect?
ANLB terminates SSL and forwards HTTP requests to targets
BNLB routes traffic based on URL paths
CNLB forwards TCP traffic preserving client IP with proxy protocol headers
DNLB drops UDP packets on port 443
Step-by-Step Solution
Solution:

  1. Step 1: Understand NLB with TCP and proxy protocol

    NLB forwards TCP traffic and can preserve client IP using proxy protocol headers.

  2. Step 2: Exclude other behaviors

    SSL termination and HTTP routing are ALB features; UDP is unrelated here.

  3. Final Answer:

    NLB forwards TCP traffic preserving client IP with proxy protocol headers -> Option C

  4. Quick Check:

    NLB TCP proxy protocol = preserves client IP [OK]
Quick Trick: NLB forwards TCP with client IP via proxy protocol [OK]
Common Mistakes:
MISTAKES
  • Assuming SSL termination on NLB
  • Expecting URL routing on NLB
  • Confusing UDP with TCP behavior

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