cloud computing

Question 1

Cloud Computing

Answer 1

on-demand delivery of computer power, databases, applications. paygo + scalable.

Question 2

Network

Answer 2

cables, routers, servers

Question 3

Switch

Answer 3

takes packet and sends to correct server / client on network.

Question 4

Cloud Deployment Models

Answer 4

• private (out of scope)
• public: owned and operated by 3rd party cloud service provider delivered over the internet
• hybrid: control over sensitive info + scalable of public info

Question 5

5 Characteristics of Cloud:

Answer 5

• on demand self-service: no human interaction with service provider
• broad network access: resources available over network and accessed by diverse client platforms
• multi-tenancy + resource pooling: multiple customers can share same infrastructure + apps, multiple customers serviced from the same physical resources
• rapid elasticity + scalability: acquire and dispose resources based on demand
• measured service: usage measured and paygo

Question 6

6 Advantages of Cloud Computing:

Answer 6

• trade capital expense (CAPEX) for operational expense (OPEX): reduce total cost of ownership (TCO) + OPEX, no hardware
• benefit from massive economies at scale
• stop guessing capacity + base on actual usage
• increase speed + agility
• stop spending money on data centers
• go global in minutes

Question 7

Infrastructure as a service (Iaas)

Answer 7

provide building blocks for cloud IT, network, computers, data storage; offers highest level of flexibility

ex: EC2, GCP, Rackspace, Digital Ocean, Linode

Question 8

Platform as a service (Paas)

Answer 8

only manage data and applications, remove need to manage underlying infrastructure

ex: Elastic Beanstalk, Heroku, Google App Engine, Windows Azure (Microsoft)

Question 9

Software as a service (Saas)

Answer 9

complete product run and managed by service provider (i.e, Zoom, Dropbox, Rekognition, Gmail)

Question 10

AWS 3 PAYGO

Answer 10

1. compute time
2. data storage
3. data transfer OUT of the cloud (data transfer IN is free)

Question 11

AWS Regions:

Answer 11

cluster of data centers with codes: eu-west-2, us-east-1

things to consider when choosing an AWS region:

• compliance: w/ data governance + legal requirements - data never leaves region unless explicit
• proximity: to customers because of reduced latency
• availability: some services / features available i diferent regions
• pricing

Question 12

Availability Zones

Answer 12

composed of one or more discrete data centers with redundant power/networking/connectivity + used to deploy infrastructure

Question 13

AWS Global Services

Answer 13

• identity and access management (IAM)
• route 53 (DNS services)
• CloudFront (content delivery network)
• WAF (web app firewall)

Question 14

AWS Regional Services

Answer 14

• EC2 (Iaas)
• Elastic Beanstalk (Paas)
• Lambda (Faas)
• Rekognition (Saas)

Question 15

AWS Responsibility Model (Cloud Computing)

Answer 15

• AWS: security OF the cloud
• customer: responsible for security IN the cloud