Which ALB feature should you use to implement this?
hard📝 Application Q15 of 15
AWS - Elastic Load Balancing
You want to design a scalable web app using ALB that routes traffic based on user device type: mobile users to tg-mobile and desktop users to tg-desktop. Which ALB feature should you use to implement this?
AUse ALB path-based routing with <code>/mobile</code> and <code>/desktop</code> paths
BUse ALB health checks to detect device type
CUse ALB listener rules with HTTP header-based routing on the User-Agent header
DUse ALB sticky sessions to route users based on device
Step-by-Step Solution
Solution:
Step 1: Identify how to detect device type in requests
User device type is typically indicated in the HTTP User-Agent header.
Step 2: Choose ALB feature for routing based on headers
ALB supports listener rules that route traffic based on HTTP headers like User-Agent.
Step 3: Evaluate other options
Health checks do not detect device type; path-based routing requires URL changes; sticky sessions maintain session but don't route by device.
Final Answer:
Use ALB listener rules with HTTP header-based routing on the User-Agent header -> Option C
Quick Check:
Header-based routing = device type routing [OK]
Quick Trick:Use header-based routing on User-Agent for device detection [OK]
Common Mistakes:
MISTAKES
Using health checks to detect device type
Relying on path-based routing without URL changes
Confusing sticky sessions with routing logic
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