Network Load Balancer
Definition
A network load balancer distributes connections across multiple target systems.
A load balancer that distributes connections to multiple targets based on network and transport layer information, such as IP addresses and ports.
Simply explained
A switchboard routes incoming connections to various available computers.
Why it matters in practice
Helps develop and operate digital systems robustly, securely, and maintainably.
Example from business
TCP or UDP connections to a model endpoint are distributed across multiple healthy instances.
Limits and pitfalls
- Do not equate the generic term with a cloud product of the same name or with automatic scaling; do not plan health checks, connection state, and failures.
Origin & history
Load balancing evolved with highly available client-server and web systems.
Use in mid-sized companies
- Possible application: TCP or UDP connections to a model endpoint are distributed across multiple healthy instances.
Frequently asked questions
What does network load balancer (Layer 4) mean?
A load balancer that distributes connections to multiple targets based on network and transport layer information, such as IP addresses and ports.
Which mistakes should be avoided?
Do not equate the generic term with a cloud product of the same name or with automatic scaling; do not plan health checks, connection state, and failures.
Sources
Source verified on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
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