L1 - Cloud Introduction

Question 1

ITaaS

Answer 1

IT as a Service:
- users can rent the basic necessities to build a virtual data center from a virtual storefront

Question 2

3 Cloud Service Models

Answer 2

IaaS, PaaS, SaaS

Question 3

What does IaaS offer?

Answer 3

Virtualization of servers, storage, networking

Question 4

What does PaaS offer?

Answer 4

• application infrastructure services: databases, execution environments, integrated development platforms
• serverless computing
• scalable application middleware (databases, file systems)

Question 5

Examples of PaaS

Answer 5

MS Azure: Microservice Fabric
Amazon: Faas
Google: Application Engine

Question 6

SaaS offers

Answer 6

• consumer or industrial applications to individual or enterprise users
  technologies:
• standard applications as well as cloud native applications
• multi-tenancy

Question 7

Examples of SaaS

Answer 7

• Salesforce
• Google
• Dropbox

Question 8

4 Deployment Models

Answer 8

Public Cloud
Community Cloud
Private Cloud
Hybrid Cloud

Question 9

What is the public cloud?

Answer 9

IT resources are provisioned over the internet via Web applications or services from an off-site third-party provider

Question 10

What is the community cloud?

Answer 10

shared by a group of organizations

Question 11

What is the private cloud?

Answer 11

• IT services are offered via private networks for the exclusive use of one client, providing full control over data, security, and quality of service

Question 12

Cloud Definition

Answer 12

Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort. Build of 3 service models and 4 deployment models.

Question 13

5 essential characteristics of the cloud

Answer 13

• on-demand self-service
• broad network access
• resource pooling
• rapid elasticity
• measured service

Question 14

What is on-demand self-service about?

Answer 14

A consumer can unilaterally provision computing capabilities, such as server time and network storage, as needed.

Question 15

What is broad network access about?

Answer 15

Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms (mobile phones, laptops)

Question 16

What is resource pooling about?

Answer 16

The provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources.

Question 17

What is rapid elasticity about?

Answer 17

Capabilities can be elastically provisioned and released to scale rapidly outward and inward, commensurate with demand.

Question 18

What is a measured service?

Answer 18

Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service.

Question 19

SaaS definition

Answer 19

The capability provided to the consumer is to use the provider’s applications running on a cloud infrastructure. The applications are accessible from various client devices like a web browser or a program interface.

Question 20

PaaS definition

Answer 20

The capability provided to the consumer is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programming languages, libraries, services, and tools supported by the provider.

Question 21

IaaS definition

Answer 21

The capability provided to the consumer is to provision processing, storage, networks and other fundamental computing resources where the consumer is able to run arbitrary software, which includes OSs and applications.

Question 22

What does Amazon EC2 provide?

Answer 22

EC2 = Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud.
- VMs running inside the cloud
- ephemeral (running for a short time) storage tied to VM
- block storage that persists over time
- virtual firewall to secure network
- Based on Xen hypervison

Question 23

Pros of the cloud?

Answer 23

• economies of scale
• elasticity
• rapid deployment
• no capital investments
• collaboration
• sharing of resources

Question 24

Cons of the cloud

Answer 24

• security
• vendor lock-in
• monthly fees
• controllability