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Question 1

5 characteristics of cloud computing

Answer 1

1. on-demand self-service
2. broad network access
3. resource pooling
4. rapid elasticity
5. measured service

Question 2

on-demand self-service

Answer 2

customers can provision compute time
and data storage without requiring intervention of a system administrator at the service provider

Question 3

broad network access

Answer 3

widely accessible over the network using
standard protocols

Question 4

resource pooling

Answer 4

with the same set of resources multiple customers are served; resources can be dynamically reassigned. Customer has no control over exact location of resource (apart
from specifying region).

Question 5

rapid elasticity

Answer 5

automatic acquisition and release of resources to enable up- and downscaling. Available capacity appears unlimited to the customer.

Question 6

measured service

Answer 6

all use of resources is metered. Can be used for monitoring and billing.

Question 7

three service models

Answer 7

• Software as a Service (SaaS)
• Platform as a Service (PaaS)
• Infrastructure as a Service (IaaS)

Question 8

SaaS

Answer 8

applications running on a provider’s cloud infrastructure, accessible through a “thin client” interface (for example web browser, smartphone App)

eg. web-based e-mail, web-based document processing, social media platforms, online bookshops

Question 9

PaaS

Answer 9

Deploy applications onto cloud infrastructure, written using languages/libraries/services supported by the cloud provider

• abstract deployment: no control of underlying hardware resources

eg. Google App Engine

Question 10

IaaS

Answer 10

“Rent” computing resources: CPU time, storage, networking. Arbitrary software can be run on these resources

Question 11

how novel is cloud computing?

Answer 11

the individual technologies (virtualization, utility computing, service metering, broad network access) are not new. Cloud computing is a combination of existing technologies

Question 12

FaaS

Answer 12

Functions as a Service: write functions that are hosted in the cloud
- no need to think about servers and infrastructure
- function is invoked by an app running on a terminal
- pay per function invocation

Question 13

4 deployment models

Answer 13

1. private cloud: private to single organization
2. public cloud: infrastructure open for use by general public
3. community cloud: exclusive use by a community of users
4. hybrid cloud: infrastructure that is any combination of the above

Question 14

multi-cloud

Answer 14

use resources from multiple cloud providers because you might not want to rely on a single provider

Question 15

federated clouds

Answer 15

multiple organizations pooling their cloud infrastructure together to create a single larger infrastructure