The 802.11 standard has many variants including 802.11g, 802.11n single band, 80

Question

The 802.11 standard has many variants including 802.11g, 802.11n single band, 802.11 dual band, 802.11ac, and 802.11ad. 802.11g is obsolete and it is still widely used. A) What are the advantages and disadvantages (comparison) of all of these wireless transmission standards? B) Why are obsolete standards still being used?

Ethernet is not the most reliable method of network transmission, but it is the most common standard. Wireless is not the most efficient method of network transmission, but it is the most convenient. Cloud computing is not the most secure method of sharing information but it is the most accepted for mobile devices. Explain why you believe these technologies are adopted when there are other more reliable, efficient, and secure methods of transmitting and sharing information.

Explanation / Answer

A) What are the advantages and disadvantages (comparison) of all of these wireless transmission standards?

Standards: 802.11g, 802.11n single band, 802.11 dual band, 802.11ac, and 802.11ad.

802.11g:

Advantages:

*It supports combining the best of both 802.11a and 802.11b thus making it backward compatible with 802.11b wireless network adapters with its 802.11g access points and vice versa.
*802.11g supports bandwidth of maximum 54 Mbps and uses 2.4 GHz frequency range.
*It provides maximum and fast speed connectivity.
*The signal range is greater.
*It has less signal obstruction issues.
*It is fast.

Disadvanatges:

*It is more expensive than 802.11b.
*The devices are vulnerable to signal interference on unregulated signal frequency.

802.11n single band:

802.11n single band uses 2.4 GHz band.

Advantages:

*It is used specifically for single office, with small area.
It is cheaper than a dual band router.

Disadvantages:

*It supports only single band devices using 2.4 GHz devices and cannot communicate with any 5 GHz devices.
*It has weaker signal.
* The signal range is not far.
*A sepaprate range extender will need to be used for range benefits.
*It is not scaable in adding more devices.
* Meant only for few devices with simple web surfing and email access purposes.

802.11 dual band:

Advantages:

*It supports dual band, i.e., 2.5 GHz and 5 GHz devices.
* It can communicate with 802.11n single band (2.4 GHz) devices.
*It supports larger area meant for users to stream high quality and sized video contents in offices or large homes.
*Transmission capacity between 600-900 Mbps more than 802.11n single band.
* Has more throughput.
*It is scalable in adding more devices.

Disadvantages:

*It is more expensive than 802.11n single band.

802.11ac:

Advantages:

*It provides the fastest connectivity speed which is 3 times faster than 802.11n.
* It has the best signal range covering large area.
*The stream rates ranges for these bandwidth sectors are 7.2 - 96.3Mbps for 20MHz bandwidth, and 15 – 200Mbps for 40MHz bandwidth, 32.5 - 433.3Mbps for 80MHz bandwidth and 65 - 866.7Mbps for 160MHz bandwidth.
*It is best suited for mobile devices.
*It consumes less battery life.
* There is much less interference.
*It detects the wireless signals and only strengthens the signal to those dvices rather sending signal in all directions.
* Supports more devices.
*Better performance.
*Wider channel
*Better modulation scheme.
*The quality is high.

Disadvantages:

* It more expensive than 802.11n.
* There are some devices which do not support 802.11ac
* It runs only on 5 GHz frequency band.

802.11ad:

Advantages:

*It uses 60 MHz ISM band spectrum instead of 2.4 Hz or 5 GHz frequency bands.
* It's speed has maximum of 7 Gbps.
* The higher the singal the higher amount of the data it can carry.
* Better throughput than any other 802.11 standard.

Disadvantagess

* They do not propagate as well as lower frequencies.
*IT has short effective range.
* Meant only for Smaller places with specific demands for a high-bandwidth and short range access.
*It is expensive.

B) Why are obsolete standards still being used?

802.11g is obsolete and is still being used because it is fast providing a maximum of 54 Mbps speed connection and the routers which do not support 802.11n are less expensive.

Explain why you believe these technologies are adopted when there are other more reliable, efficient, and secure methods of transmitting and sharing information.

Ethernet is the most common standard:

Advantages:

*This is because the Internet or the Network connection is very reliable compared to wireless connection,
*No packets or data are lost during the transit.
*This technology also provides reliability with acknowledge sent to the sender devices that the destination devices have received the data or not.
*Ethernet supports scalability of the number of devices connected to the network, the amount of data tranportation on the lines and high speed Internet bandwidth connections ranging from 100 Mbps to 1000 Mbps.
* Data protection or Security: It uses appropriate Firewalls for security of incoming and outgoing data.
* Easy to use.
* There will not be any decrease in the network transmission once it is setup.

Wireless is the most convenient method of network transmission.

Advanatages:

*High mobility of the computers and other devices connected to the network.
* Requires less installation costs, setup overhead, configuration, manpower for the ethernet cables which run, the hubs, switches, routers connected to the cables and other devices.
*Sometimes you get dongle or data card which act as router, switch, modem, storage device for wireless internet connection.
*Provides a large area coverage of network.
*There is a less distance limitation compared to ethernet wired networks.
*It is easy to use, to setup, create a wireless network and configure it.
*It has accessibility.
*IT saves time.
*It supports scalability more than an ethernet network in adding new computers and devices on the network.

Cloud Computing:

* Cloud computing is the most accepted technology for mobile devices to share information as it is an an available on-demand technology resources utility service accessed over the Internet and you pay only for what you use.

* Basically, you store (storage) your files in the cloud. Example: iCloud, DropBox, OneDrive, Google Drive, AWS, etc.

* Servers and resources located in multiple distinct data centers in different regions across many countries in the world store the data or information providing reliability on failover by always maintaining high availability anytime, balancing the load on teh demand of the data access by many users across the world, provide disaster recovery options and provide durability of the data.

Below are the sollutions offered by cloud computing technology for different devices such as desktops, laptops, mobile devices, etc.

Common Cloud usages:

Web Apps :

Examples :
SAP
CRM

Google Docs for :
Documents
Spreadsheets

Microsoft Office Online for

Word Online
Excel Online
PowerPoint online
Outlook Web Access (Email)
SharePoint Online

Mobile devices can access the data, share information by collaboration, use teh SAAS (Software As A Service) applications on them anyday, anytime, from anywhere, from any type of mobile devices, with any type of architecture, operating system on them. All the devices would is an Internet connection.

Organizations' approaches to the cloud.

What solutions and services Public Cloud Service Providers offer :

Storage
Computing Power
Databases
Networking
Analytics
Developer Tools
Virtualization
Security

Benefits :

*Quick provisioning.
*No upfront Capital investments (Expenditure).
*No service, cost and duration commitments.
*It supports variable expense.
*All On-Premise environment services & resources are available on Cloud Service Providers' platforms.
*Pay-As-You pricing model - Pay only for what you use.
*Economies of Scale.
*Low cost.
*Powerful and robust resources.
*Easier capacity planning elastically.
*No Heavy lifting and racking of infrastructure - no On-Premise Datacenters required.
*More time available for innovation of application and business.
*Experimenting and testing is fast.
*Improved Time to Market.
*Go Global in minutes.
*High Availability.
*High Durability.
*High Scalability.
*High Security.
*High Reliability.
*High Flexibility.
*High Redundancy.
*Highly Seamless.
*Ease of Accessibility in different ways, using different devices from anywhere and anytime.
*Cloud Service can be used to store any type digital files with any formats, any number and of any size.
*Very Less Administration.
*Simpler.
*Easier.
*Less Risk.
*Seamless integrations.
*No ordering, buying, lifting, racking, stacking, de-provisioning of physical servers, network and storage devices.
*Widespread tools.
*Open Source support.
*High Flexibility.
*Used for different uses cases comfortably with different solutions, services, features compatible with the business requirements.
*Consumes very less time on Infrastructure deployment and management.
*Sped & Agility.
*Uniform.
*Fault Tolerant.
*Integration with On-Premise resources and services.
*Does not have the issue when there is an issue of inability to serve customers at high demand with no or less resources, servers, services, network and storage devices in hand.
*There is an opportunity for cost savings when there is less of demand of services and data.
*It uses automated virtualization technology.

On-Premise traditional data center has capital expenditure.
Cloud has variable expense.

What Cloud Service Providers do so traditional organizations need not be concerned about their Information Technology, Infrastructure and data centers.

They manage:

*Data centers
*Power
*Cooling
*Cabling
*Networking
*Racks
*Servers
*Storage
*Labour

Cloud Computing provides:

IaaS: Infrastructure as a Service
PaaS: Platform as a Service
SaaS: Software as a Service

Mobile devices across the world can basically leverage teh centralized management, scalable and elastic cloud resources, network, storage, platforms, development and other technologies with no limit on the functionality, storage networking, computing and mobility services offered by cloud computing on millions of mobile devices of varied types with cliud accessibility from anywahere, anyday and anytime on the Internet.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.