Cloud Computing Concepts and Architectures
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Video Transcription
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>> Welcome back to the CCSK Exam Prep Course from Cybrary.
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In this module, we are going to create the foundation and
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the building blocks of content for
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subsequent modules and activities of this course.
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It's very important because we're going to
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be defining the core.
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What is Cloud computing at an theoretical,
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abstract, business value level?
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It really gives you a good perspective
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on ways you're going to look at things
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and the way we're going to analyze in
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more detail the various aspects
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and considerations that Cloud brings
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in particularly when it comes to security.
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Moving forward in this video,
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we're going to review the definitions of Cloud computing,
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as well as the role of resource
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pooling in the Cloud model.
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While this information may
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be perceived as very introductory,
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if you've been working with Cloud,
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it's always good to take
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a step back and just re-understand
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the core principles and foundations around
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Cloud so that you can have an intelligent conversation,
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maybe somebody that's not so technical,
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just explaining it in the most simplistic terms.
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What is Cloud and why
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is it a big thing in the technology space?
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Let's start by defining Cloud computing itself.
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Here we have two different definitions.
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One from NIST, one from ISO.
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Cloud isn't just a technology thing.
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It is an operational model for managing, controlling,
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and paying for technology infrastructure
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that's being used.
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Let's read the NIST definition of Cloud computing.
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You're not going to have to recite these verbatim,
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but you're really going to want to understand
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what these are and some of
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the important elements of these definitions.
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Cloud computing is a model
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for enabling ubiquitous, convenient,
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on-demand network access to a shared pool of
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conjurable computing resources, networks, servers,
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storage applications, and services that can be rapidly
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provisioned and released with
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minimal management effort or
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service provider interaction.
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We're gong get further into
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defining and decomposing Cloud.
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You'll see which aspects of
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this definition really stand out to
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create a difference between
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just traditional virtualization and true Cloud,
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whether it's a public Cloud or private Cloud,
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there are some things beyond just saying, Oh,
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it's virtual servers, therefore it's the Cloud.
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There's much more than that.
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If we look at the ISO definition,
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it's a paradigm for enabling network
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access to scalable and elastic pool of
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shareable physical or virtual resources with
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self-service provisioning and administration on-demand.
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You're starting to get a theme.
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It's more than just virtual machines.
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Elastic, being able to scale up, scale down,
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being able to self-service and
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perform these operations without calling
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somebody is sitting over in the datacenter or some
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sort of an admin level person enabling
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end-users or enabling businesses more
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directly to be able to
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allocate resources from this common pool.
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In fact, if we expand on that concept of
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a Cloud as a pool of resources,
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let's talk about it a little more.
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It really is the simplest way to describe
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Cloud is you take a bunch of computers,
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CPU, memory, a bunch of data storage devices.
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You pull them all together.
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Then you have somebody who's responsible for managing
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those physical resources as well as
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the networking and connections between those resources.
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The network to access
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those resources from an external place,
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whether it's over the Internet,
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such as a public Cloud provider
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or even within an internal network.
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Then we have this layer of
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virtualization that sits on top of that,
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which allows the Cloud users to allocate
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portions of those resources within
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these pools when they want to do it.
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Then when they're done with those resources,
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they let go of the resources and
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they return them to the general pool.
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It's an on-demand utility.
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It's a model for usage
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like electricity in a certain sense.
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The pools, as they get allocated
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to the individual clients or customers.
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They're isolated from other clients and customers.
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But this common pool may be getting access by
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multiple clients and customers in different businesses,
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in different industries, maybe even competitors.
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That concept of having such a different audience,
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tapping on the same resource pool is often referred to as
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multi-tenant environment and we'll be getting into that.
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You'll be hearing that term again and again.
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Let's talk a little bit more about a Cloud user.
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I've mentioned client, customer.
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I'm going to use certain terms interchangeably,
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but as a basis,
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let's define some of these things.
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A Cloud user is a person or organization requesting
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and using the resources of the Cloud.
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This is a NIST term that we're defining here.
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I might just call them a client,
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I may call it the consumer.
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I might even say the term Cloud actor.
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This is the end-user,
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the beneficiary of the Cloud,
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the person who's paying the Cloud.
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But on the other end of the spectrum we
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have the Cloud provider,
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that's the person or organization that delivers and
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manages that resource pool, the compute,
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network and storage, I might call it the service,
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I may say Cloud service provider,
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I may just say service provider.
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Brokers, carriers, these are other aliases that
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you should just be aware of because
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when you're taking the exam,
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these terminologies may be used.
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Then of course, when I'm talking to it,
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I might flip between these different terms,
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but it's very important we have the end-user,
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the beneficiary of the Cloud.
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Then we have the person who's providing and
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managing and taking care of the Cloud and of course,
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charging the end-user for the Cloud
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and doing some billing and so forth.
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That wraps it up for this video.
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Just to recap what we were looking
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at the tail end of the video,
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we reviewed the definition of Cloud computing,
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the NIST version, as well as the ISO definition.
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We looked at resource pooling,
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the role of resource pooling,
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as well as defining a lot of
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terminology that we'll be using for the remainder of
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this course and you'll also encounter on the CCSK exam.
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