Cloud and Datacenter Architecture Flashcards
1
Q
Scalability
A
- Costs involved in supplying more of the service linearly
- If costs more than double for twice the users, it is less scalable
- Horizontal/scaling out: adding more nodes
- Vertical/scaling up: adding resources to each node
2
Q
Elasticity
A
- Systems ability to handle changes in demand in real time
- Also able to reduce costs when demand is low
3
Q
Resouce pooling
A
- Resources are not dedicated to single customer
4
Q
Virtualization
A
- Provisioning resources using management software rather than hardware
5
Q
Public Cloud Model
A
- Service offered to cloud consumers or tenants
- Subscriptions or pay as you go financing
- Often provide low tier services free of charge
- Risks from shared resources involve performance and security
6
Q
Hosted Private
A
- Hosted by a third party exclusive use for one org
- More secure and better performance but more expensive
7
Q
Private
A
- Owned by org
- One business unit often manages cloud services
- Greater control
- Often banking of government
8
Q
Community
A
- Several orgs share costs of hosted private or fully private cloud
9
Q
Hybrid
A
- A combination of the other cloud models
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10
Q
IaaS
A
Infrastructure as a Service
- Provisioning servers, load balancers, SANs, etc. quickly.
- Renting as needed from service providers data center
11
Q
SaaS
A
Software as a Service
- Access sofrware on vendors servers with Pay as you go or lease agreement.
- Virtual infrastructure allows provisioning on demand quickly
- Tested and developed in cloud without needing to be deployed on user computers
- 365, Salesforce, Gsuite
12
Q
PaaS
A
Platform as a Service
- Somewhere between SaaS and Iaas
- Deploys servers and storage but provides webapplication/database platform on top
- Oracle or MS SQL or MySQL
- Platform would not be configured to do anything
- Your own developers would need to create software that runs using platforms like CRM or e-commerce
- Provider is responsible for integrity of platform components
13
Q
DaaS
A
Desktop as a Service
- Removes need for org to deploy and maintain client PCs and software installs
14
Q
API
A
Application Programming Interface
- Simplest way to access cloud services
- Can also be implemented with VPN
- Can suffer from performance issues from latency and bandwidth throttling
- Should not be a solution for mission critical or high volume applications
15
Q
Internet/VPN Connection
A
- Connecting to cloud services over website or API
- VPN can be used if supported by cloud provider
- Cost effective and easy to implement for distributed users
- Can suffer from poor performance and latency from the public internet
