Networking, Explained

Networking in the cloud comes up in almost every conversation, whether you’re spinning up a VM, deploying a database, or building a Kubernetes cluster. At first glance, the acronyms can feel overwhelming, but in practice the concepts are straightforward once you see how they fit together (hoping you don't suck at Tetris 😁).

The Basics

Cloud networking is simply the way your resources talk to each other and to the internet.

• VPC (Virtual Private Cloud, or "VNet" on Azure) - your own isolated space in the provider’s network.
• Subnet - smaller sections within that VPC, usually grouped by purpose (public vs private).
• Gateway - the entry or exit point for traffic (internet gateway, NAT gateway, VPN gateway).
• Firewall/Security Group - the rules that define who is allowed to connect.

Every provider offers these core building blocks, even if the labels are slightly different.

A VPC is like a gated community - your private space in a much larger city.
Subnets are the neighborhoods inside - some are open to the public, others reserved for residents only.
A gateway is the front gate - deciding what traffic comes in and what goes out.
Firewall rules are the security guards - enforcing who gets through and under what conditions.

Why It Exists

Think of networking as organization and control. You wouldn’t connect all your personal devices to an open Wi-Fi without rules. The same applies in the cloud. Networking ensures your workloads are secure, structured, and connected in the right way - without which everything’s wide open, packets are flying in every direction, databases are shouting at each other, and the whole setup feels less like a system and more like a building on fire.

Common Pitfalls

A few areas tend to cause confusion:

• Using overly open rules - “allow all” feels convenient but removes protection.
• Public vs private subnets - not every resource should face the internet.
• NAT - often misunderstood, it allows outbound traffic while keeping resources private.
• Multi-region setups - moving data across regions is rarely free.

Why It Matters

Sound networking design is the foundation of both security and performance.

• On AWS, every workload requires a VPC and subnets.
• On Azure, VNets connect cloud resources across regions and to on-prem environments.
• On Oracle, Virtual Cloud Networks (VCNs) provide the same kind of isolation.
• On DigitalOcean, VPC networks let you group Droplets, databases, and Kubernetes clusters in a private space that only you control.

Cloud networking often looks like this: structured, connected, and kind of futuristic. But every connection you see above is a rule, and every missing one is a ticket waiting to happen 🙂.

The TAM Lens

From a TAM perspective, networking questions come up constantly. It’s less about deep technical details and more about clarity. Teams want to know how to keep things secure without overcomplicating, how to connect resources without unexpected costs, and how to design in a way that scales smoothly. Good networking is really about making choices that balance simplicity, security, and cost.

How to Stay Sane

Map it out - even a simple diagram can save a lot of troubleshooting.
Keep it simple - avoid rules that open everything by default.
Use private subnets - only expose what absolutely needs internet access.
Tag and label - make it clear which team owns which piece.
Review monthly - networking rules drift over time and can be forgotten.

Final Thoughts

Networking doesn’t need to feel intimidating. At its core, it’s about setting boundaries and making sure the right resources can talk to each other. Get the basics right - VPCs, subnets, gateways, and rules - and you’ll have a foundation that’s both secure and predictable.