PW0-105 Online Practice Questions and Answers

Given: Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 and 6).

What deployment flaw could cause this problem? (Choose two)

A. The access points are mounted too closely to one another.

B. Reflective objects in the area are causing significant multipath.

C. A client station is using active scanning to probe for access points on multiple channels.

D. The output power on the access points is too high.

E. A client station authenticates to both access points, but does not associate.

F. The access points are not synchronized to the same NTP server.

Given: As defined in the 802.11 specification, legacy Power Save requires an inefficient back-and-forth frame exchange process. Due to this inefficiency, many WLAN device implementations use a variation of

802.11 Power Save to accomplish the same function.

What non-standard power save behavior is used by most Wi-Fi devices in actual implementations?

A. Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon.

B. After each beacon, the AP attempts to empty its frame buffer by sending Wake-on-WLAN frames to wake each dozing client.

C. Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered data.

D. The Beacon interval is changed from the default 100 time units to 10 or less time units.

E. Clients send null data frames to the AP and switch the power management bit from 1 to 0 to receive queued data.

F. Stations send a CTS-to-self frame to the AP with a very long duration period so they can receive all of their buffered data at once.

ABC Company has just purchased a 6 dBi patch antenna. After performing some tests with the 6 dBi antenna, they have concluded that more antenna gain is needed to cover their outdoor courtyard. When choosing an antenna with higher gain, what other antenna characteristic will also change?

A. Fresnel Zone size

B. Maximum input power

C. Beamwidth

D. Impedance

E. VSWR Ratio

In an 802.11b/g system, what channels are considered non-overlapping? (Choose two)

A. Channels 5 and 10

B. Channels 1 and 5

C. Channels 3 and 7

D. Channels 2 and 8

E. Channels 8 and 11

F. Channels 10 and 13

What frequency band is NOT specified for use by IEEE 802.11 radios?

A. 902 - 928 MHz ISM band

B. 2.4000 2.4835 GHz ISM band

C. 4.94 4.99 GHz public safety band

D. 5.15 5.25 GHz UNII band

E. 5.470 5.725 GHz UNII band

F. 5.725 5.875 GHz ISM band

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE

802.11 WLANs?

A. 802.11a and 11n use six (6) "pilot" subcarriers as a reference for the receiver to detect frequency and phase shifts of the signal.

B. 802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.

C. With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding rates.

D. 802.11n HT-OFDM utilizes 256-QAM, which increases the data rate from 54 Mbps (with 64-QAM) up to 65 Mbps.

E. In 802.11a OFDM, forty-eight (48) subcarriers are used as parallel symbol transmission paths to carry data.

What term describes the effect of increasing the intensity of an RF wave with an antenna by focusing the energy in a specific direction?

A. Spatial Multiplexing

B. Active Amplification

C. Beam Compression

D. Passive Gain

E. Isotropic Radiation

Given: You are being interviewed by ABC Company for employment as a wireless site survey engineer. The interviewing manager asks you what items should be included in a manual RF site survey report.

What answer would be accurate? (Choose two)

A. Itemized list of equipment, licenses, and support contracts required for the facility

B. RF heat map illustrating coverage and signal quality for each frequency band

C. Documentation noting physical security hazards in the RF coverage area

D. Documentation noting where each access point will be placed and how it will be mounted

E. Documentation noting how each WLAN user group will authenticate to the network

If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and indirect (reflected) paths, what effect will the reflected signal have on the signal that took the direct line-of- sight path?

A. The direct signal will only be received if the reflected signal is more than 180 degrees out of phase.

B. The direct signal cannot be received if the indirect signal is less than 90 degrees out-of-phase.

C. The signals will be distorted if the indirect signal arrives simultaneously at the receiver, but 90 degrees out-of-phase.

D. If the signals are in-phase, they will combine together, cancel one another out, and create a null.

When a client moves to a new BSS within an ESS, what steps are part of the 802.11 reassociation process? (Choose two)

A. The client station transmits a Reassociation Request frame to its current access point.

B. The current access point informs the IP gateway of the reassociation.

C. The current access point triggers the client's reassociation service.

D. The new access point transmits a Reassociation Response to the client station with a status value.

E. The client and new access point create unicast encryption keys.

F. The client station transmits a deauthentication frame to the current access point.