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Wi-Fi 802.11b & 802.11g related issues and their answers

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 Supposedly, 802.11b is backwards compable with 802.11g, yet this lab demonstrates

there are signicant problems with allowing the two to coexist. What is the primary

incompability between b and g?

 !"

  !      !   #    !!  $  %     $

& '

• $!$  !

!$

$"!$!$

• $$!$  !

!$$

"!$!$

•  (

&$!$ )"

      &    "*             

!$ $ +*!$ $

 $!

+                  ,%-  !*        

!!!!$ !$".'

* */! !

 There is another mechanism besides RTS/CTS that helps the incompability. Explain brie'y

the di(erence between RTS/CTS and CTS-to-self and when each is used.

%"  012314*  !"

31.%31."!% Request to Send

01Clear to Send31*!$  '  '

3101$ %56)16) 1!" $$

$ *01$ )51)11

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)    1!  " (    *  !      31  $    31  $    

"  *$ $*



01231 731 7 3 1    31  01 * !

"  $    "  $   ' /    %38       1)1

*"*-

%"7-%75*3103$  

*!"" 4!903231

$  $ $ *

:";" $!

< What is the protecon scheme talked about in the standard? In short, how do 11g nodes

know that an 11b node is associang and how is CCK involved?

/!  !*$ 3383 ! 38+*

  !/$/;"" 

$ !$& "!/

*    &  $  "!    )1)    )  1*  )     



Eliminang ISI Altogether

=6.=/6*."!'  ! 

 !$ "!)1*)

=6.!! "!!+

**  ! %

 $>> >?338 

> In addion to the added overhead of the RTS/CTS scheme, what else causes the drop in

throughput you see? Are there other factors that can a(ect the throughput?

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1. Supposedly, 802.11b is backwards compatible with 802.11g, yet this lab demonstrates there are significant problems with allowing the two to coexist. What is the primary incompatibility between b and g? The 802.11b & 802.11g networking (Wi-Fi) standards are usually compatible. 802.11b router or access point works with 802.11g network adapters & just the opposite of it. A number of technical affect 802.11b & 802.11g networks to mix- The client of 802.11b would be unable to get good network performance as compared to when it is connected with 802.11g access point (router). This is due to the fact that such kind of connection is restricted due to the speed of the adapter of 802.11b. The client of 802.11g will face slow network performance as compared to when it is connected with 802.11b access point (router). This is due to the fact that such kind of connection is restricted due to the speed of the adapter of 802.11g. When both 802.11g & 802.11b clients are connected to the same router i.e. 802.11g, client connected to 802.11g can suffer due to lack of performance. In worst situations all 802.11g clients may suffer slow connectivity similar to 802.11b clients leading to degrade th ...
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