Wireless Technologies Flashcards
802.11a
Use Bandwidth up to ?Mbps
Has a Frequency spectrum around ?GHz
Disadvantages are ?
Advantages are ?
54Mbps
5GHz
Frequency shortens range and the higher Frequency make 802.11 more difficult to penetrate obstructions like, walls.
Speed and regulated frequencies prevents signal interference.
802.11b
Supports a band width up to ?Mpbs
Is the 2.4 GHz signal frequency Regulated or Unregulated?
Cons
Pros
11Mpbs
Unregulated
As the 2.4 is used by so many devices it can incur interference. Slowest maximum speed
Lower cost, Good signal range and not easily obstructed.
802.11g
Combines best of both which two 802.11’s? And is it backward compatible?
Bandwidth up to ?Mbps
Uses which ? GHz frequency?
Pros
Cons
A and B
54Mbps
2.4 GHz
More expensive but still may occur interference from the B’s frequency problems
Fast speed, Good signal and not easily obstructed
802.11n (wireless N)
Does this use one or Multiple antennas?
What is the supported bandwidth ?Mbps
Cons
Pros
Multiple
600Mbps at 5GHz
Standard not finalized. More expensive than 802.11g
Fastest maximum speed & range. Most resistant to interference and Backward comparable.
802.11ac
Is this a dual band wireless tech?
Does it support 2.4GHz, 5GHz or both?
What is the band width ratings
Yes!
Both
1300Mbps on 5 GHz & 450Mbps on 2.4 GHz
What does Saas Mean?
Cons
Pros
Software as a Service
Third Party providers already have applications which is offered as a Service. Like, CRM’s ERP Databases
Security (privacy), Compliance (Location is unknown) Performance (accessing through internet)
Time of deployment, Ease of admin, Scalability, Accessibility and is resilient.
What is PaaS?
Cons
Pros
Platform as a Service
Used to develop and deliver applications over the internet.
Lack of control, Shared platform, Data security
Testing and deployment, Dynamic allocation, improved support & Minimal management
What does IaaS mean?
Infrastructure as a Service
It provides Virtual machines, operating systems, networking & security
Maintenance (upgrades), Security, Legal considerations (depending on where data resides)
Lower infrastructure costs, Scaleability, high availability
What is a private cloud?
Uses proprietary architecture - dedicated to a single organization.
Ideal for businesses with dynamic or unpredictable computing needs.
Businesses that require direct control.
Cons - Higher costs, maintenance (power, cooling, damage)
Pros - Security, performance & management
What is a Public Cloud?
Cloud platform for service providers to offer - infrastructure, applications and storage
Cons - Securtiy, control & limited flexability
Pros - Cost savings, Multi tenant environment.
What is a Hybrid Cloud?
Combination of a private and public Cloud.
Cons - Infrastructure dependency, security issues public to private.
Pros- Scalable, cost efficient, better security, flexibility for where data resides.
What is a community Cloud?
Collaborative effort on the part of several organizations.
Cons - Securtiy, compliance and jurisdiction.
Risk factors SaaS (Software as a Service)
Data ownership Identity and access management Data disposal Broad exposure Software systems development Browser vulnerabilities Exit strategy
Risk Factors for Public - Cloud
Data Pooling -
Infrastructure is shared by multiple tennants
Tenants have no relations to other tenants or enterprises
No common concerns or interest for security.
Collateral damage - Can an attack on one tenant affect me?
Risk factors of a Private Cloud
Application compatibility- old applications - Customised software
Investment - Requires certain skill set- Training recruitment maintenance of info structure.
