Question 1

Which two statements about line-of-sight communication are true? (Choose two.)

Options :

A : A signal might reflect on an object and be successfully received in a place from which the sender cannot be seen

B : For a 6-foot person, the horizon appears at about 6 miles.

C : Visual obstacles always prevent adequate line of sight.

D : Visual line of sight is necessary for good signal transmission.

E : The distance between the sender and receiver must be at least 25 miles apart for earth curvature to play a role in the quality of outdoor links

Answer: A,B

Question 2

You are installing an AP to be used by 23 laptops. All laptops will connect on the 5 GHz frequency band. A neighbor network uses channels 1 and 6. What channel should be used for this AP and why?

Options :

A : A 5 GHz channel, because channels 1 and 6 are 2.4 GHz channels they have no impact on the decision

B : Channel 1, because it is best to use the channel with the lowest frequency

C : Channel 11, because channels 1 and 6 are in use nearby

D : Channel 6, because it is always best to use this channel

Answer: A

Question 3

You are configuring an access point to use channel 128. What important fact should be considered about this channel?

Options :

A : It is a channel that is unsupported by most access points

B : It is a 22 MHz channel so it will overlap with the channels above and below it

C : It is a 2.4 GHz frequency band 40 MHz channel, so it should not be used

D : It is a channel that likely requires DFS when used

Answer: D

Question 4

You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?

Options :

A : All clients implement single spatial stream radios

B : The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth

C : The clients are all 802.11n STAs or lower

D : The short guard interval is also enabled.

Answer: C

Question 5

You are evaluating access points for use in the 5 GHZ frequency band. What PHY supports this band and supports 80 MHz channels?

Options :

A : HT

B : VHT

C : OFDM

D : ERP

Answer: B

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