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- All right, so now
let's run through a demo

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of adding a subnet to an existing VPC.

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So here we are, logged
in to the ADV US console.

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I'm on the VPC dashboard.

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And what I want to do is filter

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by the VPC that we recently created.

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In this case the one at 10 2 00/16.

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And then from there,
I'm gonna go to subnets.

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And you'll see that we don't have any

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for this VPC yet.

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Now it's important to note,

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that you can't launch resources

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such as EC2 instances, virtual machines,

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or databases, directly into a VPC.

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You have to have a subnet,

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in order for resources to

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have a place to live in the network.

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And so we're going to create a subnet.

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Now here, I might call this one

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our public A.

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Because I'm going to put this one,

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you'll notice, that I'm going to choose

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an availability zone here.

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Again, subnets are specific
to an availability zone.

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So this one is going
to be my public subnet

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in us-east-2a.

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Us-east-2, being the Ohio Region.

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Now when I set the slider block

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for that subnet, it has to fall

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within the range of our VPC

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being 10 2 00/16.

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I could create a subnet that takes up

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the entire range of
the VPC if I wanted to.

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But by doing so, that would prevent me

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from creating any more.

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And that's not what I wanna do.

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So here, I'm just gonna do 10.2.0.0/24.

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That would give me somewhere around 250

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useable IP addresses.

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So I'm gonna go ahead and create that.

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Okay, and sometimes it takes it

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a few seconds, it shouldn't take

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no more than a minute.

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There we go.

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And now we can see that
we've created a subnet.

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We can see what VPC it belongs to.

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It belongs to our ADV US live lessons

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10 two 16 subnet.

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And this subnet has this
particular slider range.

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Now you might be wondering, a slash 24,

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if you're familiar with slider notation,

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you would know that slash 24

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would allow up to 256 IP addresses.

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It's important to note,

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that the first four, for any given subnet,

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the first four, and the last one address,

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are reserved by Amazon
for special purposes.

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The last address being the dot 255

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is the broadcast address.

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And that's not used by
AWS, so they reserve it.

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The first four are reserved for

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special purposes like routing

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and local VPC DNS.

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So we have a subnet in the
us-east-2a availability zone.

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And we'll go ahead and create one more.

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Just to run through it one more time.

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And I'm gonna call this Public B, again.

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This is arbitrary, what
you name it is up to you.

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It depends on what this particular subnet

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is being used for.

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I'm gonna make sure I have the right,

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I don't want the default VPC,

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I want the one that I created recently.

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And this one, I'm going to use

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2b availability zone.

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Which, again, is a completely different

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set of data centers
somewhere down the road

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away from 2a.

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In this case, I'm going to use 10.2.1.0

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so that I don't overlap
with the previous one.

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Again, slash 24 and create that as well.

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So there we go, we have our two subnets

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that we've created.

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Public A and Public B.