Networking Basics Cloud Level

Networking is a core part of cloud computing. It connects your servers, databases, and users so that applications can work properly. You do not need deep knowledge at the start, but understanding the basics is very important.

1. What is a Virtual Network

A virtual network is a private network created inside the cloud.

It works like a normal network in your home or office, but it exists inside cloud infrastructure instead of physical cables and routers.

Examples
Amazon Web Services VPC Virtual Private Cloud
Microsoft Azure Virtual Network

Example in real life
If you create servers in the cloud and connect them so they can talk to each other securely, you are using a virtual network.

Why it matters
Keeps your cloud resources organized and secure
Allows communication between services

2. Public vs Private Network

In cloud, networks are divided into public and private parts.

Public Network
Resources are accessible from the internet

Example
A website server that users can access from anywhere

Private Network
Resources are not directly accessible from the internet

Example
A database that only your backend server can access

Example in real life
Your website frontend is public, but your database runs in a private network for security.

Why it matters
Helps protect sensitive data
Separates public and internal systems

3. IP Address Basics

An IP address is a unique number used to identify a device on a network.

It works like a home address for computers.

Types of IP addresses

Public IP
Used to connect to the internet
Example a website server IP

Private IP
Used inside a private network
Example communication between servers

Example in real life
When you open a website, your device connects to a server using its public IP address.

Why it matters
Helps devices find and communicate with each other

4. DNS Basics

DNS stands for Domain Name System.

It converts human readable domain names into IP addresses.

Example
When you type google.com, DNS converts it into an IP address so your browser can connect to the server.

Example services
Google Cloud DNS
Amazon Web Services Route 53

Example in real life
Without DNS, you would have to remember IP addresses instead of simple names like google.com.

Why it matters
Makes the internet easy to use
Helps route traffic correctly

5. Subnets Basic Idea

A subnet is a smaller network inside a virtual network.

It helps organize resources.

Example
You can create one subnet for public servers and another for private databases.

Why it matters
Improves security and management

6. Internet Gateway Basic Idea

An internet gateway allows your virtual network to connect to the internet.

Example
If your web server needs to be accessed by users worldwide, it must be connected to an internet gateway.

Why it matters
Enables public access to your application

Summary

Virtual network is a private network in the cloud

Public network is accessible from the internet
Private network is restricted and secure

IP address is the identity of a device

DNS converts domain names into IP addresses

Subnets help organize networks
Internet gateway connects cloud to the internet

These basics are enough to understand how networking works in cloud without going into advanced details.