Cloud service models (IaaS, PaaS, SaaS) in Intro to Computing - Draw & Build Visually

Draw This - beginner

Draw a diagram that shows the three main cloud service models: IaaS, PaaS, and SaaS. Use simple boxes to represent each model and include a brief example inside each box. Connect the boxes with arrows to show how they build on each other, starting from IaaS at the bottom, then PaaS, and SaaS at the top.

10 minutes

Hint 1

Hint 2

Hint 3

Hint 4

Grading Criteria

Diagram includes three boxes labeled IaaS, PaaS, and SaaS

Boxes are stacked vertically with IaaS at the bottom, PaaS in the middle, SaaS at the top

Each box contains a correct example of the service model

Arrows connect the boxes showing the build-up from IaaS to SaaS

Labels and examples are clear and legible

Solution

          +---------------------+
          |        SaaS          |
          |  (e.g., Gmail)       |
          +----------+----------+
                     |
          +----------v----------+
          |        PaaS          |
          |  (e.g., Heroku)      |
          +----------+----------+
                     |
          +----------v----------+
          |        IaaS          |
          |  (e.g., AWS EC2)     |
          +---------------------+

This diagram shows the three main cloud service models stacked vertically.

IaaS (Infrastructure as a Service) is at the bottom. It provides basic computing resources like virtual servers and storage. Example: AWS EC2.

PaaS (Platform as a Service) is in the middle. It offers a platform with tools to develop and run applications without managing the underlying hardware. Example: Heroku.

SaaS (Software as a Service) is at the top. It delivers ready-to-use software applications over the internet. Example: Gmail.

The arrows show how each model builds on the one below it: SaaS uses platforms from PaaS, which in turn use infrastructure from IaaS.

Variations - 2 Challenges

[intermediate] Draw a flowchart that helps decide which cloud service model (IaaS, PaaS, or SaaS) a company should choose based on their needs: managing hardware, developing apps, or using ready software.

[advanced] Draw a detailed diagram showing the responsibilities of the user and the cloud provider in IaaS, PaaS, and SaaS models. Use two columns labeled 'User' and 'Provider' and list who manages what for each model.

Practice

1. Which cloud service model provides basic computing resources like virtual machines and storage, but you manage the operating system and applications?

easy

A. Platform as a Service (PaaS)

B. Infrastructure as a Service (IaaS)

C. Software as a Service (SaaS)

D. Network as a Service (NaaS)

Solution

1. Step 1: Understand IaaS role

   IaaS provides virtual machines, storage, and networks but leaves OS and apps management to the user.

2. Step 2: Compare with PaaS and SaaS

   PaaS provides a ready platform including OS, and SaaS delivers complete software ready to use.

3. Final Answer:

   Infrastructure as a Service (IaaS) -> Option B

4. Quick Check:

   Basic resources you manage = IaaS [OK]

Hint: IaaS = raw resources you control, not full software [OK]

Common Mistakes:

• Confusing PaaS with IaaS
• Thinking SaaS provides infrastructure
• Selecting NaaS which is unrelated here

2. Which of the following is the correct description of SaaS?

easy

A. You use fully ready software delivered over the internet.

B. You get a platform to develop apps without managing infrastructure.

C. You rent virtual machines and manage software yourself.

D. You manage physical servers in your own data center.

Solution

1. Step 1: Identify SaaS characteristics

   SaaS delivers complete software applications accessible online without user management of infrastructure or platform.

2. Step 2: Eliminate other options

   You rent virtual machines and manage software yourself. describes IaaS, B describes PaaS, and D is not cloud service.

3. Final Answer:

   You use fully ready software delivered over the internet. -> Option A

4. Quick Check:

   Ready software online = SaaS [OK]

Hint: SaaS = software ready to use online, no setup needed [OK]

Common Mistakes:

• Mixing SaaS with IaaS or PaaS
• Thinking SaaS requires managing servers
• Confusing physical servers with cloud

3. Look at this scenario:
A developer uses a cloud service to write and test an app without worrying about servers or storage.
Which cloud model is the developer using?

medium

A. IaaS

B. DaaS (Desktop as a Service)

C. PaaS

D. SaaS

Solution

1. Step 1: Analyze developer's needs

   The developer writes and tests apps without managing servers or storage, indicating a managed platform.

2. Step 2: Match with cloud models

   PaaS provides a ready platform for app development and testing, unlike IaaS which requires managing infrastructure.

3. Final Answer:

   Platform as a Service (PaaS) -> Option C

4. Quick Check:

   Develop apps without infrastructure = PaaS [OK]

Hint: Develop apps without managing servers = PaaS [OK]

Common Mistakes:

• Choosing IaaS thinking it hides servers
• Confusing SaaS with development platform
• Selecting unrelated DaaS option

4. A company wants to use cloud services but mistakenly chooses a model where they must install and manage the operating system and software updates themselves. Which model did they likely choose by mistake?

medium

A. IaaS

B. PaaS

C. SaaS

D. FaaS (Function as a Service)

Solution

1. Step 1: Understand management responsibilities

   IaaS requires users to manage OS and software updates, unlike SaaS and PaaS which handle these.

2. Step 2: Identify the model based on user tasks

   Since the company manages OS and updates, they are using IaaS, likely by mistake if they wanted less management.

3. Final Answer:

   Infrastructure as a Service (IaaS) -> Option A

4. Quick Check:

   Manage OS and updates yourself = IaaS [OK]

Hint: If you manage OS, it's IaaS, not SaaS or PaaS [OK]

Common Mistakes:

• Confusing PaaS with IaaS management
• Thinking SaaS requires OS management
• Selecting unrelated FaaS option

5. A startup wants to quickly launch a web app without worrying about hardware, OS, or software updates. They also want to customize the app's code. Which cloud service model best fits their needs?

hard

A. IaaS, because it offers full control over hardware and software

B. On-premises servers, because they want full control

C. SaaS, because it delivers ready-made software with no customization

D. PaaS, because it provides a platform to develop and deploy apps without managing hardware or OS

Solution

1. Step 1: Identify startup's requirements

   They want to avoid managing hardware and OS but still customize app code.

2. Step 2: Match requirements to cloud models

   PaaS provides a ready platform for app development and deployment without hardware or OS management, allowing code customization.

3. Step 3: Eliminate other options

   IaaS requires hardware and OS management, SaaS offers no code customization, and on-premises requires full management.

4. Final Answer:

   Platform as a Service (PaaS), because it provides a platform to develop and deploy apps without managing hardware or OS -> Option D

5. Quick Check:

   Customize app without hardware hassle = PaaS [OK]

Hint: Customize apps without hardware management = PaaS [OK]

Common Mistakes:

• Choosing IaaS thinking it hides hardware
• Selecting SaaS expecting customization
• Ignoring cloud and choosing on-premises