Cloud Computing Concepts

Question 1

Name the 3 Cloud Service Models

Answer 1

IaaS - Infrastructure as a Service
PaaS - Platform as a Service
SaaS - Software as a Service

Question 2

What is the concept of IaaS ?

Answer 2

You manage OS + Apps.
AWS manages hardware.

Question 3

What is the concept of PaaS ?

Answer 3

You manage Applications.
AWS manages OS + Infrastructure.

Question 4

What is the concept of SaaS ?

Answer 4

Fully managed software

Question 5

Examples of IaaS

Answer 5

• EC2 (virtual machines)
• EBS (block storage)
• VPC (networking)

Question 6

Examples of PaaS

Answer 6

• Elastic Beanstalk
• RDS
• Lambda (partially serverless)

Question 7

Examples of SaaS

Answer 7

• WorkMail
• Amazon Connect

Question 8

Core AWS Global Infrastructure Concepts

Answer 8

Regions
Availability Zones (AZs)
Edge Locations

Question 9

What is a Region ?

Answer 9

• Physical geographic locations (e.g., us-east-1, eu-west-1).
• Each region is isolated.
• You choose region for latency & compliance.
• It contains multiple Availability Zones.

Question 10

What is an AZ ?

Answer 10

• One or more discrete data centers within an AWS Region.
• Designed for high availability
• AZs are isolated from each other

Question 11

Core AWS Compute Services

Answer 11

• EC2
• Auto Scaling
• Lambda

Question 12

Core AWS Storage Services

Answer 12

• S3 ( Simple Storage Services )
• EBS ( Elastic Block Storage )
• EFS ( Elastic File System )

Question 13

Core AWS Networking Services

Answer 13

• VPC ( Virtual Private Cloud )
• Subnets
• Security Groups
• NACLs ( Network Access Control Lists )

Question 14

Core AWS Identity & Security Services

Answer 14

• IAM ( Identity and Access Management )
• IAM Roles

Question 15

What is EC2 ?

Answer 15

Refers to Virtual Machines
You choose:
- Instance Type ( CPU/RAM)
- QS
- Storage

Question 16

What is Lambda ?

Answer 16

• Serverless Compute
• Runs code with managing servers

Question 16

What is Auto Scaling ?

Answer 16

Automatically add/remove EC2 instances based on load

Question 17

What is S3 ( Simple Storage Service ) ?

Answer 17

• Object Storage
• Highly durable ( 11 9’s )
• Used for backups, logs, artifacts

Question 18

What is EBS ( Elastic Block Storage ) ?

Answer 18

• Block Storage for EC2
• Like a virtual disk

Question 19

What is EFS ( Elastic File System ) ?

Answer 19

Shared File System ( NFS )

Question 20

What is a VPC ?

Answer 20

It is your isolated network in AWS

Define:
- Subnets
- Route Tables
- Internet Gateways
- NAT Gateways

Question 21

What is a SG ( Security Group ) ?

Answer 21

• It’s an instance level firewall
• it’s a virtual firewall that controls inbound and outbound traffic to your EC2 instance.
• It’s Stateful

Question 22

What are the 2 Scalability Concepts ?

Answer 22

• Vertical Scaling
• Horizontal Scaling

Question 22

Provide a list of High Availability Concepts ?

Answer 22

• Fault Tolerance
• Load Balancers ( ELB/ALB )
• Multi-AZ RDS

Question 23

What is Vertical Scaling ?

Answer 23

- Increase in instance Size Eg. t3.medium to t3.large

Question 24

What is Horizontal Scaling ?

Answer 24

- Adds more instances - Used with Auto Scaling + Load Balancer

Question 25

What are the AWS Pricing Concepts ?

Answer 25

- Pay As you Go - On Demand - Reserved Instances - Spot Instances

Question 26

Which tools are used for Monitoring ?

Answer 26

- CloudWatch - CloudTrail

Question 27

Name the 6 Pillars of the Well Architected Framework?

Answer 27

Operational Excellence Security Reliability Cost Optimization Sustainability Performance Efficiency

Question 28

What is the customer and AWS responsible for in terms of the Shared Responsibility Model

Answer 28

The Customer is responsible for Security "IN" the Cloud. AWS is responsible for Security of the Cloud.