You have a microservices app requiring routing based on HTTP headers and need to preserve client IP addresses. Which load balancer setup best fits this?

hard📝 Architecture Q8 of 15

AWS - Elastic Load Balancing

AUse NLB with HTTP listeners

BUse NLB with proxy protocol enabled

CUse ALB with TCP listeners

DUse ALB with X-Forwarded-For header enabled

Step-by-Step Solution

Solution:

Step 1: Identify routing needs
Routing based on HTTP headers requires ALB, which supports advanced HTTP routing.
Step 2: Preserve client IP
ALB preserves client IP using the X-Forwarded-For header.
Final Answer:
Use ALB with X-Forwarded-For header enabled -> Option D
Quick Check:
HTTP header routing + client IP = ALB + X-Forwarded-For [OK]

Quick Trick: ALB + X-Forwarded-For for HTTP header routing [OK]

Common Mistakes:

Using NLB for HTTP header routing
Enabling proxy protocol on ALB
Confusing listener protocols

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You have a microservices app requiring routing based on HTTP headers and need to preserve client IP addresses. Which load balancer setup best fits this?

Step 1: Identify routing needs

Step 2: Preserve client IP

Final Answer:

Quick Check:

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