What are Layer 4 and Layer 7 load balancers?

Question

HARI Kannan · Accepted Answer

Layer 4 Load Balancer: Operates at the Transport Layer (OSI Layer 4). It routes traffic based on IP addresses and TCP/UDP ports without inspecting the actual data. Example: AWS Network Load Balancer (NLB). Used for fast, low-latency routing of TCP/UDP traffic. Layer 7 Load Balancer: Operates at the Application Layer (OSI Layer 7). It routes traffic based on application-level data like HTTP headers, URLs, and cookies. Example: AWS Application Load Balancer (ALB). Used for HTTP/HTTPS traffic with advanced routing and content-based decisions.

What are Layer 4 and Layer 7 load balancers?

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