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1.1.1. Why Networks Exist
Think of a network as a postal system for data. You need addressing (IP addresses) so packets know where to go, routing (how to get there), and delivery guarantees (did it arrive?). But unlike physical mail, networks must handle millions of "letters" per second while keeping unauthorized parties from reading or rerouting them.
The Three Problems Every Network Solves:
| Problem | What It Means | Azure Solution |
|---|---|---|
| Addressing | Unique identity for every resource | IP addresses (private/public), DNS |
| Routing | Path selection from source to destination | Route tables, BGP, VNet peering |
| Access Control | Who can communicate with whom | NSGs, Azure Firewall, Private Link |
When you encounter an exam question about network design, ask yourself: "Which of these three problems is this question really about?"
Written byAlvin Varughese
Founder•15 professional certifications