CompTIA A+: Cloud Computing Flashcards

1
Q

describe features of the IaaS

Infrastructure as a service

A

requires a cloud provider from which you host components you need-
generally low level resources - Virtual machines / networks / appliances

The starting point as a customer ability to grow and scale easily without much investment

Supplementary Services include
Detailed billing
monitoring
log access / security
load balancing
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2
Q

list features of SaaS

Software as a service

A

provides host applications
software on demand model - clients simply access the app via internet. thus no local installations on client computers.

no service agreements/ no local licenses

Common applications include: client relationship management
HR/ Financial / Collab / Email management

Pros:
flexibility/ scalability
pay-as-you-go
less inhouse management 
everything maintenance is host based.

Cons:
Dependent on the 3rd party.
data security
billing

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3
Q

list features of PaaS

Platform as a Service

A

Ideal for app development as clients acess services over the internet that come from the cloud provider.

services compliment existing resources
focus remains on development
multi-tier apps

Offerings:
processing infrastructure, storage infrastructure, version control, compiling and testing

PROs
low infrastructure management,
services are accessible through browser
Per-use model

Cons: service availability / resiliency
lock in and on-going support.

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4
Q

differentiate between public, private, hybrid, and community

A

Public: shared resources / multiple customers / accessible over internet / less confidential data

Private: privately shared resources, accessible to specific users / connectivity over internet or private network, suited for sensitive data.

Hybrid: combination of both public/private.

Community: Business community / infrastructure sharing. Private cloud space/ ideal for joint projects.

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5
Q

describe the differences between internal and external sharing

A

internal cloud resource sharing:
only able to be utilized on the same internal cloud
e.g: Data in cloud storage that is only used by cloud-based virtual macine.
a cloud database that drive some app.

External: resources in the cloud that can be used by outside apps / services.
e.g: media content delivered to customers, business intelligence data.

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6
Q

describe rapid elasticity

A

how easily you can scale the service provisioning and how quickly

refers to the fact resources are automatically requested in the cloud. Based on thresholds: then new resources are allocated automatically.

Limitless resources from client perspective.

considerations: mindful of where requests are coming from
allocation and de-allocation of resources.
management overhead. : auditing trail: monitoring resource requets.

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7
Q

list the benefits of on-demand computing

A

easy scalability
self-service
pay-per-use

Meeting peak resource requirements
meeting minimum resource requirements
improves business agility :

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8
Q

recognize the benefits of resource pooling

A

multiple individual resources draw from a pool of all resources available to the service.

E.G: for a certain data base you dictate the resource allocation. instead of these being static the are a collective pool of resources

instead of static configurations, theres a pool of resources available and can be drawn upon whenever.

Customisation: # users and demand per user.

benefits: rapid elasticity (whenever any given instance of a database feels underpowered, it can draw more from the pool) / dynamic provisioning (when it needs more resources and crosses the threshold, it draws them) / automated provisioning (set up timers to allow more resources) .

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9
Q

list considerations when using a measured service

A

knowing the configuration allows control of resources
you want to know if you have the right amount.

measurement tools: do we have adequate configuration / resources in the servers. (storage / processing/ bandwidth)

Usage details - to provider/customer - are we satisfying requests.

Service change tracking.

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10
Q

describe benefits of using a metered service

A

concerned with payment of the correct amounts.
Predictability: understand requirements, historical use, use measuring tools (resource demand and utilisation)

Capturing insights: generating reports on server/storage resources, licencing, applications.
-this can generate chargeback/showback reports.
allocation models: getting people to pay for what they use.

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11
Q

list benefits of using off-site cloud-based e-mail

A
cost savings
scale-able: dependent on users 
Optimal usage
improved up time
rapid disaster recover
improved security
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12
Q

recognize the benefits of using cloud file storage services

A

performance considerations; how much power do you need

Compatibility: can your device utilize the cloud storage

Redundancy: make copies of your data

Usage based billing:

BENEFITS : optimized provisioning: dictate your needs and configurations

Interoperatbility: broad integration

Budget: no need for anything physical.

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13
Q

describe when to use cloud-based applications

A

rapid response to business environment
redeploy to platforms easily.

Low cost
improved sharing abilities.
network control
Redundancy: store files as development is happening.

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14
Q

describe the types of virtual desktops and their purposes

A

Two types
Dedicated (persistent): each user established a remote connection to a dedicated machine (same machine every time).

Stateless (non persistent) : there is a pool of virtual machines and users connect to whichever one is free.

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