Welcome to AWS networking! At its core, networking is about how computers communicate with each other. Just like the postal service uses addresses to deliver mail, computer networks use addresses to deliver data.
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What does your computer use to find a website after you type its name?
Every device on a network, including the internet, needs a unique identifier called an IP address. An IP address looks like 192.168.1.10—a series of numbers that acts like a street address for a specific computer or server.
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Why is it crucial that every device on a network has a unique address?
In AWS, you don't use physical cables. Instead, you create a logically isolated section of the AWS Cloud called a Virtual Private Cloud (VPC). A VPC is your own private network where you can launch AWS resources.
Think of it like getting your own private, fenced-off neighborhood within the larger city of AWS.
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How is a VPC similar to having your own private neighborhood in a city?
Within your VPC, you can organize your resources into smaller network segments called subnets. A subnet is like a specific street within your private neighborhood. Each subnet lives in a single Availability Zone, helping you build highly available applications.
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Why would you want to group web servers on one "street" and databases on another?
By default, resources within a VPC can communicate with each other across subnets. This private communication is secure and fast because it never leaves the AWS global network.
This lets your application servers talk to your databases without exposing them to the public internet.
