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- Welcome to our first lesson
on networking services in AWS.

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And for this first lesson,
we're going to talk about

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one of the most commonly
used services, the VPC.

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So first off, what does VPC stand for?

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It is an acronym and it stands
for Virtual Private Cloud.

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And you can think of it as a sort of

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virtual data center network placed in AWS.

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For all the services and features

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that we're gonna talk about

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from now until the end of the course,

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I am also going to be adding
a scope into our discussion.

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The VPC network itself is region scoped,

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that means you pick a region

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like US-East-1 or AP-Southeast-1

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when you create one of these VPC networks.

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And this network is used for
quite a number of AWS services

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and for almost anything that
is scoped at the AZ level.

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It means that you are likely deploying it

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into an actual VPC network.

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Now, the first thing to
know about a VPC network

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when you create it is
that you need to provide

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a CIDR Address,

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that stands for Classless
Inter-Domain Routing.

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And it is a way of describing
a network as well as its size

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in a single string of characters.

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Now you do not have to provide
an outside network address

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to work in AWS.

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You can bring your own,
but AWS also supports

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all of the private IP
ranges that are documented

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in RFC 1918, like 10.0,
172.16, 192.68, and so forth.

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Now, an individual VPC also supports

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up to five CIDR ranges
as long as they're within

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the same base range.

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So, if you create a new VPC network

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and assign 10.0.0.0/16 to
it, any other CIDR ranges

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that you apply also need to start with 10.

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You cannot apply a
172.16.0.0 or a 192.168.0.0.

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The largest VPC network
that you can create

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has a CIDR range of /16, which
if you do the binary math,

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it means 65,536 IP addresses,

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which is large enough for the
vast majority of workloads.

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The smallest VPC that
you can create is a /28,

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which is just 16 IP addresses.

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But as we're gonna find out
when we talk about subnets,

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it's actually less than that.

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Finally, AWS also
supports IPv6 in the VPCs.

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And you can simply ask AWS to
provide you with a /56 range,

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or you can bring your own
but only one of these ranges

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is supported per VPC network.