Cloud Computing

Question 1

Define Cloud computing

Answer 1

• ability to rent computing resources - on demand
• only pay what you use
• ## use the offer of cloud provider services

Question 2

Describe the shared responsibility model

Answer 2

• Microsoft and you as the customer have divided responsibilities for all sorts of things, including security
• i.e. VM: Microsoft responsible for building, physical network and physical computer security
• the rest is your responsibilities: OS patches, firewall settings, user accounts, …
• i.e App Service more responsibility is shared: MS takes over OS patches, shared responsibility for network/firewall, application settings, authentication

Question 3

Define cloud models

Answer 3

Public cloud:
- computing services offered by third-party providers over the public internet, making them available to anyone who wants to use or purchase them
- Azure owns hardware, on their network and infrastructure

Private cloud:
- computing services offered either over the Internet or a private internal network and only to select users instead of the general public
- looks and acts like a cloud, except customer owns or leases or has exclusive access to hardware

Hybrid Cloud:
- computing environment that combines a private with a public cloud

Question 4

Name an exmaple use case for a hybrid cloud?

Answer 4

• sql stretch database with a local database
• that has behind the scenes access to the cloud when it need additional storage, seamlessly

Question 5

Identify appropriate use cases for each cloud model

Question 6

Describe the consumption based model

Answer 6

You pay only what you use:
- operations
- storage
- services used

Question 7

What is special about cloud pricing?

Answer 7

• only pay what you use
• pricing can become different from month to month
• difficult to predict
• depending on service different factors influence pricing

Question 8

Describe serverless

Answer 8

Shift from on-premise software to the cloud provider who runs the infrastructure

Question 9

Compare cloud pricing models

Answer 9

**Free Services:
**- 55+ free services, can be used as part of you solution
- some paid services have free tierts
- some have free limits

**Pay for Time:
**- some services charge by time used
- stop using services to stop charges

**Pay for GB:
**- pay for any storage used
- usually fairly cheap
- also pay for network traffic to/from other regions or to the internet

Pay for operations
- can also be charged for operations
- read/write/list/delete
- pay per message, per query to a database etc
- usually very cheap per operation

Question 10

What can influence what you pay for a servive?

Answer 10

I.e. VM pricing:
- geographical region
- instance size
- bandwith
- Reservation/Savings plan
- OS
- DiskType / Size
- Backup Storage
- Support Agreement

Question 11

What does CapEx and OpEx mean?

Answer 11

CapEx -> Capital Expenditure
- big upfront investments
- physical assets, can be later re-selled

OpEx -> Operating Expenditure
- expenses incurred through normal operations
- cost to do business