PW0-270 Online Practice Questions and Answers

What HT PPDU format is shown in the exhibit?

A. HT-mixed format

B. HT-greenfield format

C. Non-HT format

D. Non-HT duplicate format

E. Dual Training Field format

F. ERP-OFDM format

When a 5 GHz HT station in a 40 MHz BSS desires to protect a 40 MHz transmission from an OFDM station using an RTS/CTS or CTS-to-Self exchange, what frame format is used for the RTS and/or CTS frames?

A. HT-mixed format

B. HT-greenfield format

C. Dual-CTS

D. Non-HT Duplicate

E. Phased Coexistence PPDU

According to 802.11-2007, in what frame type(s) might you find the PMK Count and PMKID List fields?

A. All frames that include the RSN IE

B. Only (Re)Association Request frames

C. Beacon and Probe Response frames

D. EAPoL 4-Way Handshake frames

E. Authentication and Association Request and Response frames

According to the 802.11n-2009 amendment, what security requirement is specified for HT BSSs?

A. In an RSN, HT stations may not communicate with one another using TKIP.

B. TKIP cannot be supported in an HT BSS.

C. All unicast traffic transmitted by an HT station and destined to an HT station must use AES-CCMP.

D. HT BSSs are prevented from supporting WEP.

E. HT BSSs must mandatorily support 802.11r FT.

Given: Your network consists of HT and ERP access points, and you are implementing VoWiFi with support for U-APSD.

When an ERP handset operating in WMM Power Save mode with a ReceiveDTIMs parameter of TRUE receives a Beacon containing a DTIM indicating queued broadcast traffic, what task is the handset required to perform?

A. The handset must send a PS-Poll frame to the access point for every broadcast frame it receives with the More Data bit set to one.

B. The handset must arbitrate for the medium and immediately issue an RTS directed to the access point with the NAV set to a value of 32,768.

C. The handset must broadcast a CTS-to-Self frame indicating the station's need to control the medium long enough to receive all of the broadcast frames.

D. The handset is to remain awake to receive the broadcast frame(s) following the Beacon that contains the DTIM.

What is indicated to a QoS AP when a QoS STA sets U-APSD Flag bits to 1 in (Re) Association frames?

A. Which access categories are both trigger-enabled and delivery-enabled

B. Which user priorities require use of a TSPEC

C. Which access categories require admission control

D. Which user priorities are mapped to access categories

E. Which access categories are scheduled

Given: ABC Company recorded the 2.4 GHz band with a spectrum analyzer prior to installing their ERP WLAN. Image-A is how the band appeared prior to the WLAN installation. Image-B is how the band appears now, and all channels on their WLAN have ceased to function.

What is the best explanation as to why their WLAN is no longer functioning properly?

A. A wideband RF power source is corrupting all IEEE 802.11 transmissions.

B. A new microwave oven was installed in the cafeteria.

C. A malfunctioning IEEE 802.11 OFDM radio card is transmitting continuously.

D. A manual site survey tool is actively testing the throughput of their WLAN.

E. A Terminal Doppler Weather Radar (TDWR) is causing a DFS response across the entire band.

As it relates to a spectrum analyzer, complete the following sentence.

The ____________ plot always displays the percentage of time (shown on the Y axis) that the overall RF power is a certain specified threshold (of amplitude) above the noise floor for a given frequency range (shown on the X axis).

A. Real-Time FFT

B. Swept Spectrogram

C. FFT Duty Cycle

D. Interferer Count

E. SNR

Shown is a screenshot of a wireless protocol analyzer displaying the decode information for a single 802.11 encrypted data + CF-Poll frame. The infrastructure BSS on which this information was captured is using WEP and this particular frame was sent from a client station (STA) to an access point (AP).

As a protocol analyst, how would you explain the existence of this frame on the wireless medium given the information in the decode?

A. The IEEE 802.11 network is using both version 1 and version 2 protocols simultaneously. This unexpected frame is from the version 2 protocol set.

B. The frame was sent by a client station that does not comply with IEEE HR/DSSS standard to an access point that is Wi-Fi certified.

C. The access point is operating as a repeater, and clients must poll repeater access points in order to transmit data frames through them.

D. The frame was misinterpreted because of insufficient information received by the analyzer due to frame corruption.

As a WLAN consultant, you have been asked to troubleshoot a problem with a single wireless client station (Station-Z). Your customer informs you that other wireless client stations are not having problems with wireless connectivity, and that Station-Z is configured in the same manner as all other wireless client stations on the network. Station-Z is showing an unusually high retransmission count in its client utility statistics. Using a wireless protocol analyzer, where and how should you begin troubleshooting this problem? (Choose 2)

A. Position the analyzer halfway between Station-Z and the access point. Measure the distance between Station-Z and the access point.

B. Position the analyzer near Station-Z. Analyze Station-Z's transmissions and acknowledgements. Look for RF and obstacle-induced interference.

C. Position the analyzer near the access point. See if Station-Z's frames are reaching the access point and if so, analyze their signal strength.

D. Position the analyzer near Station-Z. Analyze the frames Station-Z is receiving, looking for delayed ACK frames.

E. Position the analyzer halfway between Station-Z and the access point. Analyze the data rate at which frames are sent and how long they take to be received.