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AWS Certified Solutions Architect study material · question 346 of 500

At which OSI layer does an Application Load Balancer operate?

  1. Layer 3, the network layer
  2. Layer 2, the data link layer
  3. Layer 7, the application layer
  4. Layer 4, the transport layer
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Answer: C. Layer 7, the application layer

An ALB works at layer 7, which is why it can route on the content of the request; a Network Load Balancer works at layer 4.

Source: What is an Application Load Balancer? (Amazon Web Services) — Application Load Balancer overview

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