CLOUD Computing notes for competitive examination by home academy

 

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☁️ CLOUD COMPUTING – COMPLETE NOTES 

📌 1. Introduction to Cloud Computing

Cloud computing is the delivery of computing services (servers, storage, databases, networking, software) over the internet (“cloud”).

🔑 Key Idea:

Instead of storing data on a personal computer, it is stored on remote servers.

✔️ Definition (Exam Point)

Cloud computing means on-demand availability of computer system resources without direct active management by the user.

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📌 2. Characteristics of Cloud Computing

Very important for MCQs:

On-Demand Self Service – User can access resources anytime

Broad Network Access – Available over internet
Resource Pooling – Shared among multiple users
Rapid Elasticity – Scalable up/down quickly
Measured Service – Pay as you use

👉 Question Tip: These are called 5 essential characteristics (NIST)

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📌 3. Types of Cloud (Deployment Models)

1. Public Cloud

Available to general public

Example: Google Cloud

2. Private Cloud

Used by a single organization

More secure

3. Hybrid Cloud

Combination of public + private

4. Community Cloud

Shared by organizations with common goals

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📌 4. Service Models (VERY IMPORTANT)

🔹 IaaS (Infrastructure as a Service)

Provides virtual hardware (servers, storage)

Example: AWS EC2

🔹 PaaS (Platform as a Service)

Provides platform to develop applications

Example: Google App Engine

🔹 SaaS (Software as a Service)

Provides software via internet

Example: Gmail

👉 Shortcut Trick:

IaaS → Hardware

PaaS → Platform
SaaS → Software

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📌 5. Advantages of Cloud Computing

Cost saving (no hardware needed)

Accessibility from anywhere
Backup and recovery
Scalability
Automatic updates

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📌 6. Disadvantages

Security issues

Internet dependency
Limited control
Downtime risk

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📌 7. Cloud Service Providers (Exam Important)

Amazon Web Services (AWS)

Microsoft Azure
Google Cloud Platform (GCP)
IBM Cloud

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📌 8. Applications of Cloud Computing

Online storage (Google Drive)

Email services
Online banking
E-learning platforms
Social media

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📌 9. Important Terms (Highly Repeated)

Virtualization – Creating virtual version of resources

Data Center – Physical location of servers
Multitenancy – Multiple users share same resources
Load Balancing – Distributing workload
Edge Computing – Processing near data source

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📊 MOST IMPORTANT MCQs (WITH ANSWERS)

Q1. Cloud computing provides services over:

A. LAN
B. Internet
C. CPU
D. RAM
👉 Answer: B

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Q2. Which model provides software over internet?

A. IaaS
B. PaaS
C. SaaS
D. DaaS
👉 Answer: C

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Q3. Which is NOT a cloud deployment model?

A. Public
B. Private
C. Hybrid
D. Centralized
👉 Answer: D

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Q4. Which service provides virtual machines?

A. SaaS
B. IaaS
C. PaaS
D. DBaaS
👉 Answer: B

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Q5. Example of SaaS:

A. Gmail
B. AWS
C. Linux
D. Router
👉 Answer: A

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Q6. Pay-as-you-go concept is related to:

A. Networking
B. Cloud computing
C. CPU scheduling
D. Compiler
👉 Answer: B

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Q7. Resource pooling means:

A. Single user access
B. Sharing resources
C. Data deletion
D. Backup
👉 Answer: B

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Q8. Which company provides Azure?

A. Google
B. Amazon
C. Microsoft
D. IBM
👉 Answer: C

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📚 PREVIOUS YEAR QUESTIONS (PYQs)

🔹 SSC CGL

Q. Cloud computing means:
A. Using internet-based services
B. Using local storage
C. Using hardware
D. None
👉 Answer: A

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🔹 IBPS Clerk

Q. SaaS stands for:
👉 Software as a Service

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🔹 RRB NTPC

Q. Which is cloud platform?
A. Windows
B. Google Cloud
C. BIOS
D. CPU
👉 Answer: B

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🔹 SSC CHSL

Q. Example of cloud storage:
👉 Google Drive

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📌 EXAM REVISION POINTS (LAST MINUTE)

Cloud = Internet-based computing

3 Models → IaaS, PaaS, SaaS
4 Types → Public, Private, Hybrid, Community
Key Feature → Pay as you go
Biggest Advantage → Cost + Scalability
Biggest Risk → Security

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🎯 HIGH PROBABILITY QUESTIONS (2026)

1. Difference between SaaS, PaaS, IaaS

2. Characteristics of cloud computing

3. Examples of cloud services

4. Cloud deployment models

5. Advantages & disadvantages

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☁️ CLOUD COMPUTING – STATEMENT BASED MCQs (JKSSB PATTERN)

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✅ Q1.

Consider the following statements about Cloud Computing:

1. It provides on-demand availability of computing resources.

2. It always requires local servers to function.

3. It follows a pay-as-you-use model.

Which of the above statements is/are correct?

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2 and 3

👉 Answer: B
✔️ (Statement 2 is incorrect)

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✅ Q2.

Consider the following statements regarding SaaS:

1. It provides software over the internet.

2. Users need to install software locally.

3. Gmail is an example of SaaS.

Which statements are correct?

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2 and 3

👉 Answer: B

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✅ Q3.

Consider the following statements about Cloud Deployment Models:

1. Public cloud is open to general users.

2. Private cloud is more secure than public cloud.

3. Hybrid cloud combines public and private clouds.

Which of the above are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1, 2 and 3
D. 1 and 3 only

👉 Answer: C

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✅ Q4.

Consider the following statements about IaaS:

1. It provides virtual machines and storage.

2. Users control operating systems and applications.

3. It provides complete software solutions to users.

Which are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

👉 Answer: A

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✅ Q5.

Consider the following statements about characteristics of cloud computing:

1. Resource pooling allows sharing of resources.

2. Rapid elasticity means fixed resources.

3. Measured service means pay-per-use.

Which are correct?

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2 and 3

👉 Answer: B

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✅ Q6.

Consider the following statements about cloud advantages:

1. It reduces hardware cost.

2. It provides offline access always.

3. It supports scalability.

Which are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

👉 Answer: C

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✅ Q7.

Consider the following statements:

1. Virtualization is core technology of cloud computing.

2. Data centers store cloud data physically.

3. Multitenancy means one user uses one server only.

Which are correct?

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2 and 3

👉 Answer: A

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✅ Q8.

Consider the following statements regarding cloud service providers:

1. Amazon Web Services is a cloud provider.

2. Microsoft Azure is a cloud platform.

3. Google Chrome is a cloud service provider.

Which are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

👉 Answer: A

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✅ Q9.

Consider the following statements:

1. PaaS provides a platform for application development.

2. SaaS provides ready-to-use software.

3. IaaS provides networking and hardware resources.

Which are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

👉 Answer: D

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✅ Q10.

Consider the following statements:

1. Cloud computing depends on internet connectivity.

2. Cloud computing eliminates all security risks.

3. Cloud services can be accessed from anywhere.

Which are correct?

A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

👉 Answer: C

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