High Load balancer Question 142 of 226

How does an L4 load balancer differ from an L7 load balancer in front of Spring Boot?

Java Specialist · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: A REST CALL

ClientGET /users/1

ServerFind row

JSON back200 OK

Simple meaning

L4 (TCP) balances connections without reading HTTP, which is simple and fast.

WHY — Load balancer instead of guessing?

Why interviewers care about Load balancer:

This is a process

question about Load balancer.

Panels listen for order,

trade-offs, and what you would actually do on a Backend project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

1
L4 (TCP) balances connections
without reading HTTP, which is simple and fast.
2
L7 (HTTP) can route
on path, header, or host, terminate TLS, and do health checks on /actuator/health.
3
Most public APIs sit
behind L7
4
you still want L4
inside a mesh for raw throughput.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line

“L7 (HTTP) can route on path, header, or host, terminate TLS, and do health check”

Break into beats

L7HTTPcanrouteonpath

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

L4 (TCP) balances connections without reading HTTP, which is simple and fast. L7 (HTTP) can route on path, header, or host, terminate TLS, and do health checks on /actuator/health.