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Friday, October 11, 2013

What are advantages and limitations of Wi-Fi?

The Wi-Fi has its own set of advantages and limitations. 

Advantages of WiFi
- WiFi makes the deployment of local Area Networks or LANs quite cheap.  
There are some areas where the cables cannot be installed such as in historical buildings and outdoor areas. 
- But these spaces do not have any problem in hosting a wireless LAN.  
Wireless Network adapters are being built into almost all the laptops by the manufacturers.
A basic level of service is provided at which different brands concerning and client network interfaces access points that are competing with each other can inter-operate. 
- The products that have been certified by Wi-Fi alliance show back word compatibility. 
- A standard device for WiFi will work at any place in the whole world unlike our phones. 
- The WPA2 or the WiFi protected access encryption is secure provided a condition that the pass phrase used is quite strong.  
- The new protocols use for WMM i.e., Quality of service increase the suitability of the Wi-Fi regarding its use in latency - sensitive applications. 
- WMM is a power saving mechanism that is used for extending the life of the battery. 

Limitations of WiFi
Inconsistency of the operation and spectrum assignments poses a problem worldwide.  
- The range all the WiFi networks is limited. 
- A wireless access point typically uses a stock antenna having a range of 100 m outdoors and 25m indoors.
The frequency band is a major factor for producing variations in the range.  
The range of Wi-Fi with a 2.4 ghz frequency block is better when compared with the 5.0 ghz frequency block Wi-Fi. 
- Some wireless routers come with detachable antennas. 
- These antennas can be removed for improving the range. 
- In their place upgraded antennas can be fitted. 
- The benefit of these antennas is that they have high directional gain at the remote devices. 
- The local regulations limit the maximum amount of power that can be transmitted by a Wi-Fi. 
- The power consumption of Wi-Fi is quite higher than the other standards.  
This is so because of the reach requirements of the wireless LAN applications.
- There are technologies available that provide a propagation range that is much shorter. 
- One such technology is Bluetooth and has very low power consumption.  
Other technologies such as zigbee have low power consumption, a long range but provides low data rate. 
- The most commonly used wireless encryption standard is WEP or wired equivalent privacy. 
- Even this standard has been proven to be breakable even if correct configuration is used. 
- This problem was addressed by WPA or Wi-Fi protected access standard to some extent. 
- By default the wireless access points use the encryption free mode. 
- The wireless security is disabled because of which the LAN can be openly accessed. 

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