WHAT IS A CIDR IN AWS? | VPC PART 2 | Visual Explanations
Channel: Pythoholic
Date: 2020-09-27

CIDR is Classless Inter-Domain Routing. Classless was termed when we ignore the address classes A B or C and we considered it as an idea where the IPV4 address has 2 parts -- the prefix part and the host part. as defined by the masking value and we don't consider the class here.

So for now think of this 10.0.0.1/16 to be an IPV4 address range, that will make up for our VPC.
But if you see here, the Block is divided into 3 parts. 
1. IP Address
2. the Slash
3. Decimal Number
And each of them has a certain significance.

And in VPC, you can add more than one subnet in your availability zone. (Don't get confused here, az, is itself a resource center where you can host applications), we will just provide it a networking group. so that we can access the instances and resources there.
We are just trying to name our smaller family groups.

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VPC Sessions :
PART1 : What is a VIRTUAL PRIVATE CLOUD? Amazon VPC | Visual Explanations : 
https://youtu.be/nmhXCqxKe-M

PART 2: WHAT IS A CIDR IN AWS? | VPC PART 2 | Visual Explanations
https://youtu.be/N-BppnZ8AoQ

⏲ Timelines for your convenience:
00:00 // Introduction
00:48 // Security Groups
06:20 // Public IP vs Private IP
11:00 // What is CIDR is AWS?
19:00 // How to get the range of IP from the Subnet?
30:40 // Task of the day?
31:10 // Outro

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