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Load Balancing & CDN

Last Updated: 10th September, 2026

Imagine your app suddenly gets huge traffic

  • Thousands of users click at the same time
  • Your single server gets overloaded
  • Website crashes

Now instead of one server, you use multiple servers

But another question arises
How do you distribute users across them?

And how do you make content load faster globally?

That’s where Load Balancing & CDN come in

saask (1).png

What is Load Balancing?

Load Balancing distributes incoming traffic across multiple servers.

It ensures:

  • No single server is overloaded
  • High availability
  • Better performance

Types of Load Balancing

Type

Use Case

HTTP/HTTPSWeb applications
TCP/UDPLow-level traffic
Internal LBPrivate communication

Technical Example

gcloud compute backend-services create my-backend \
  --protocol=HTTP

Creates a backend service for load balancing

Concept: What is CDN?

CDN (Content Delivery Network) stores copies of your content in multiple locations worldwide

Users get data from the nearest server

How CDN Works

  1. User requests content
  2. CDN checks nearest server
  3. Delivers cached content quickly

Load Balancer vs CDN

Feature

Load Balancer

CDN

PurposeDistribute trafficSpeed up content delivery
Works OnServersCached content
BenefitReliabilityLow latency

Real-Life Examples

1. E-commerce Websites

  • Load Balancer → Handles heavy traffic
  • CDN → Fast product image loading

2. Video Streaming

  • CDN delivers videos smoothly
  • Load balancer manages users

3. News Websites

  • Fast loading during peak traffic

4. Gaming Platforms

  • Balanced traffic
  • Low latency experience
Module 2: Core GCP ServicesLoad Balancing & CDN

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