Theoretical slides - Xaas

Question 1

What is Xaas?

Answer 1

Everything-as-a-Service

term that refers to the delivery of various services over the internet, typically as a subscription model.

Question 2

What are the 3 infrastructure models and how do they rank in their 3-way hierarchy of “visibility to end users?

Answer 2

IaaS (foundation)
PaaS (Application developers)
SaaS (End users)

Question 3

what is IaaS (foundation)?

Answer 3

infrastructure-as-a-service:

Third parties (vendors, providers) provide virtualised hardware as a service

Businesses “rent” this foundation to build infrastructure, applications and software

Example of popular IaaS-services:
- Microsoft Azure, OpenStack

Question 4

What does the basic infrastructore consist of?

Answer 4

For. example:
Virtual servers, storage, IP-adresses and much more

Question 5

What is the role of the third-parties (vendors)?

Answer 5

To host, manage and maintain the hardware on behalf of the customers

Question 6

What are the advantages for IaaS

Answer 6

1. Cost:
   Provide subscription model
   No need to invest in; Hardware, facilities, labor etc
2. Modular:
   Service adapted to the business
   Cost fluctate based on actual usage
3. Flexible:
   easily scaleable
   Expansion and contraction is fast

Question 7

What is PaaS

Answer 7

Platform-as-a-service
- A platform to develop enterprise apps
- It`s a hosting platform adapted to client needs
- Example: Java

Question 8

What is important in the PaaS model?

Answer 8

The businesses has access to the components of the platform
However, this requires flexibility, skill and experience
Therefore mostly limited to IT-departments

Question 9

What are the advantages of PaaS?

Answer 9

1. Scalability (ability to expand and compress when needed)
   Has a scale-out architecture - commodity servers quickly added
2. Backups
   Hosting company manages performance
3. Multilingual
   Supports apps with different languages

Question 10

What is SaaS

Answer 10

Software-as-a-service
Provides CLOUD based applications.
App totaly managed by third-party (vendor)
Access through a web browser

Examples: Microsoft office 365

Question 11

How is SaaS provided?

Answer 11

through subscription models
price based on number of users & desired features

Question 12

Advantages SaaS

Answer 12

Cheap - Cheaper than On-premise software
Simple - vendor takes care
Scalable - SaaS grows with business
Fast - Can be deployed within minutes whereas On-premise software can take months to deploy

Question 13

Disadvantages SaaS

Answer 13

Control - Competitors has access to same SaaS systems, can remove competetive advantage

Security - Data stored in cloud, security is as good as vendor provides