CWNP CWNP Certification CWAP-403 Questions & Answers

• Question 31:

  Which one of the following is not an 802.11 Management frame?

  A. Action

  B. Authentication

  C. PS-Poll

  D. Beacon

  Correct Answer: C

• Question 32:

  Finish the statement. It is possible to distinguish between and 20 MHz transmissions when looking at an FFT plot.

  A. HR/DSSS and ERP

  B. ERP and VHT

  C. HT and VHT

  D. OFDM and HT

  Correct Answer: C

• Question 33:

  What is the formula used to calculate the Duration field value in an RTS frame?

  A. RTS Duration field = CTS duration

  B. RTS Duration field = Data or management to be sent frame duration

  C. RTS Duration field = Data or management frame to be sent duration + CTS duration + one ACK duration + three SIFS

  D. RTS Duration field = Data or management frame to be sent duration + CTS duration

  Correct Answer: C

• Question 34:

  A client is operating in an unstable RF environment. Out of five data frames transmitted to the client it only receives four. The client sends a Block Ack to acknowledge the receipt of these four frames but due to frame corruption the Block Ack is not received by the AP. Which frames will be transmitted?

  A. Only the data frame which was corrupted

  B. Both the corrupted data and Block Ack

  C. All data frames

  D. Only the Block Ack

  Correct Answer: D

• Question 35:

  When performing protocol analysis, you capture an 802.11ac data frame on channel 52, transmitted at

  MSC 8.

  At what data rate was the PHY Preamble transmitted?

  A. 54 Mbps

  B. 6 Mbps

  C. 86.7 Mbps

  D. 78 Mbps

  Correct Answer: B

• Question 36:

  Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an AMPDU?

  A. The HT Operation Element

  B. A-MPDU flag in the HT Control Field

  C. A-MPDU flag in the Frame Control Field

  D. The Aggregation flag in the Radio Tap Header

  Correct Answer: B

• Question 37:

  Given: The Frame Check Sequence (FCS) is a 32 CRC used for error detection. The CRC is calculated over what?

  A. Frame Body only

  B. Mac Header and Frame Body only

  C. PHY Header, MAC Header and Frame Body

  D. PHY Header and MAC Header only

  Correct Answer: B

• Question 38:

  The network administrator at ABC Engineering has taken a large packet capture from one of their APs running in monitor mode. She has very little knowledge of 802.11 protocols but would like to use the capture file to evaluate the overall health and performance of their wireless network. When she asks your advice, which tool do you recommend she opens the packet capture file with?

  A. Capture visualization tool

  B. Protocol analyzer

  C. Spectrum analyzer

  D. WLAN scanner

  Correct Answer: B

• Question 39:

  Which one of the following should be the first step when troubleshooting a WLAN issue?

  A. Identify capture locations

  B. Identify probable causes

  C. Perform an initial WLAN scan and see if any obvious issues stand out

  D. Define the problem

  Correct Answer: D

• Question 40:

  Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the STA. Less the 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still very low, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?

  A. There is a transmit power mismatch between the client and the AP and while the client can hear the Aps traffic,the AP cannot hear the client.

  B. The portable analyzer has a lower receive sensitivity than the AP and while it can't capture the packets from the client STA, the AP can receive them OK.

  C. The STA is transmitting data using more spatial streams than the potable analyzer can support

  D. The portable analyzer is too close to the AP causing CCI, blinding the AP to the client's packets

  Correct Answer: B