Learn how cloud networking works and understand virtual networks, subnets, IP addresses, routing, DNS, gateways, load balancers, and network security.
Cloud Network Architecture
Internet & Users
DNS
Load Balancer
Virtual Network
Subnets & Routing
Cloud Applications
Introduction
Cloud networking is the process of connecting cloud resources, applications, users, and services through virtual networks and software-defined networking technologies.
Cloud providers allow organizations to create logical networks, define IP address ranges, create subnets, configure routing, and control how traffic moves between cloud resources.
Understanding networking fundamentals is essential for building secure, scalable, and reliable cloud applications.
Core Concepts
These networking components help cloud resources communicate securely and efficiently.
A virtual network provides an isolated logical network environment where cloud resources such as servers, containers, databases, and applications can communicate.
Examples
Subnets divide a virtual network into smaller network segments. They help organize workloads, improve network design, and create security boundaries.
Examples
IP addresses identify resources within a network. Cloud environments can use private IP addresses for internal communication and public IP addresses for internet access.
Examples
Routing determines how network traffic travels between subnets, virtual networks, cloud services, and external networks.
Examples
Domain Name System services translate domain names into IP addresses and help applications and users locate cloud services.
Examples
Load balancers distribute incoming traffic across multiple servers or application instances to improve availability and performance.
Examples
Network Architecture
Cloud applications typically use multiple networking layers to connect users with infrastructure and services.
Users, devices, applications, and external systems access cloud services through the internet or private connectivity.
DNS services direct requests to the correct applications, endpoints, or cloud resources.
Load balancers and gateways manage incoming and outgoing network traffic.
Virtual networks provide logical isolation and connectivity between cloud resources.
Subnets organize workloads while routing controls how traffic moves between network segments.
Virtual machines, containers, databases, and applications operate inside the cloud infrastructure.
Network Security
Network security controls help protect cloud infrastructure, applications, services, and data from unauthorized access.
Security groups can control inbound and outbound traffic to cloud resources.
Firewalls help filter traffic based on configured security rules and policies.
Private connectivity can be used to securely connect cloud environments and private infrastructure.
Subnets and network boundaries can separate workloads and reduce unnecessary access.
Network Design
Follow these steps to understand the basic process of designing a cloud networking environment.
Identify applications, users, workloads, connectivity requirements, and expected network traffic.
Create the main virtual network environment and define an appropriate IP address range.
Divide the network into logical segments for public services, applications, databases, and other workloads.
Define route tables and gateways to control how traffic moves between network resources.
Configure firewalls, security groups, access rules, and network policies to protect cloud resources.
Monitor traffic, latency, connectivity, availability, and network performance.
Traffic Flow
When a user accesses a cloud application, the request usually passes through several networking components before reaching the application.
DNS helps locate the application endpoint, load balancers can distribute traffic, routing determines the network path, and security rules control which traffic is allowed.
Example Request Flow
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