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Question: (QID:BCM424) - Printable Version

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Question: (QID:BCM424) - philly457 - 06-27-2009

Help...Can someone look at the following question. H2P states C is correct, but I think E is correct. Please let me know what you guys think - thanks

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Question: (QID:BCM424) View the exhibit. The signal transmitted from the AP is reflected off a wall resulting in multipath interference at the client end. Which statement is true?


a. If signal 2 is close to 360 degrees out of phase with signal 1, the result is essentially zero signal or a dead spot in the WLAN

b. If signal 1 is in phase with signal 2, the result is essentially zero signal or a dead spot in the WLAN

c. The transmitted signal from the AP arrives at the client at slightly different times resulting in phase shifting

d. Multipath interference is less of an issue when using a DSSS technology because multipath is frequency selective.

e. Multipath interference is solved by using dual antennas.


Re: Question: (QID:BCM424) - RGraham1 - 06-29-2009

I think in this case the dual antennas don't matter since they are on the transmitting device.  Having dual antennas gives you a better chance not to be in a spot where you receive signals that arrive out of phase, with troughs and crests cancelling each other out.  It's unlikely that both antennas would be in such a spot, so it's better to have 2 antennas than 1. 

See this link:

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml   


Re: Question: (QID:BCM424) - philly457 - 06-29-2009

RGraham

So you think the answer is C ???


Re: Question: (QID:BCM424) - philly457 - 06-30-2009

Admin, can you confirm the answer is C


Thanks


Re: Question: (QID:BCM424) - forumsupport - 07-09-2009

Sorry for answering late. Yes, the correct answer is C.


Re: Question: (QID:BCM424) - ourproject - 07-26-2009

e. It helps reduce the issue but doesn't solve it. So the correct answer is 'C'