Question 1

Finish the statement: It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.

Options :

A : HR/DSSS and ERP

B : OFDM and HT

C : ERP and VHT

D : HT and VHT

Answer: B

Question 2

What action is taken automatically by 802.11 APs and client STAs as the signal strength of the link weakens in order to improve the quality of the RF communications overall?

Options :

A : Output power is increased

B : RSSI is increased

C : Data rates are reduced

D : Antenna gain is increased

Answer: C

Question 3

Given: Adjacent Channel Interference (ACI) can cause frame corruption and poor performance in WLANs. You are using a protocol analyzer in the attempt to detect ACI. What should you look for in such a scenario?

Options :

A : Look at Retry counts

B : Capture on the channel you think may be impacted by ACI and see if any frames are captured from adjacent channels

C : Look for frames with a low signal strength value in the radio tap header

D : Look at CRC errors

Answer: B

Question 4

You are considering disabling the data rates of 1, 2, 5.5 and 11 in the 2.4 GHz band. What advantage might this provide to the networks operating in this band?

Options :

A : The antennas will be able to zero in on the higher data rates better

B : The range of the PHY preamble and header will be reduced

C : Frames that must be transmitted at the lowest common data rate can be transmitted at higher data rates after the change

D : The RF signals will not travel as far

Answer: C

Question 5

You are explaining capacity planning to another engineer assisting you on a WLAN implementation project. As part of the explanation, you provide the following formula: C = B * log2(1 + S/N). What does this formula define?

Options :

A : Bandwidth capabilities of a channel

B : The WEP encryption algorithm

C : Minimum signal strength for a data rate

D : Maximum signal strength of a channel

Answer: A

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