CWAP-404試験無料問題集（190題）「CWNP Certified Wireless Analysis Professional 認定」

出題：1

Which common feature of a Spectrum Analyzer would be the best to help you locate a non-
802.11 interference source?

A. Device finder

B. Max hold

C. Waterfall plot

D. Location filter

正解：A 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：2

When using a commercial WLAN protocol analyzer, you notice that it is listing vendor names for some APs and client STAs.
What is the source of this information?

A. Vendor OUI values

B. Banner grabbing

C. Broadcast name resolution

D. DNS name resolution

正解：A 解答を投票する

出題：3

You are tasked with describing the various frames used in 802.11 communications.
What frame is used for spectrum management, fast BSS transition and some other actions taken within a BSA?

A. PS Poll

B. BlockAck

C. CTS

D. Action

正解：D 解答を投票する

出題：4

While at a government-operated facility, you are attempting to troubleshoot a WLAN performance problem using a wireless protocol analyzer. When you start capturing frames, you see a proprietary layer 2 protocol running over the ERP network as shown in this screenshot. The facility's WLAN administrator confirms that this protocol is proprietary and used for both data encryption and compression.

How will this information affect the steps you take to troubleshoot performance problems on this WLAN?

A. In order to troubleshoot performance problems on a network using proprietary encryption protocols like this one, you must use a wireless protocol analyzer that has integrated support for the protocol in use.

B. Troubleshooting will be somewhat limited because only part of the information needed for performance measurements by the analyzer is encrypted. Each Data frame's MAC header will be encrypted, but the PLCP header can still be decoded successfully.

C. The proprietary encryption protocol will have no effect on your troubleshooting steps because the wireless protocol analyzer can still decode the PLCP and MAC headers of Data frames. This situation is essentially no different than troubleshooting a WLAN that uses WPA2-Personal.

D. As long as you load the proprietary software codec onto your analyzer computer, you will be able to see all of the Data frame information fully decoded. Loading the proprietary software codec will allow you to troubleshoot the WLAN as though no encryption were in use.

正解：C 解答を投票する

出題：5

What is the purpose of a PHY preamble?

A. It communicates important information about the PSDU's length, rate, and upper layer protocol- related parameters.

B. It indicates to the PHY the modulation that shall be used for transmission (and reception) of the PSDU.

C. It provides a cyclic redundancy check (CRC) for the receiving station to validate that the PLCP header was received correctly.

D. It provides the receiver(s) with an opportunity for RF channel synchronization prior to the start of the PLCP header.

正解：D 解答を投票する

出題：6

What is an AIFS?

A. The shortest period of time a STA can sleep

B. A medium access method introduced by 802.11n, but never implemented

C. A variable Interframe Space introduced by 802.11e to help prioritize medium access for different Access Categories

D. A form of aggregation performed at the PLCP sub-layer

正解：C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：7

In which 802.11 frames is the SSID present, provided the SSID is not removed through proprietary software configuration by an administrator? (Choose 3)

正解：A,C,D 解答を投票する

出題：8

You have been asked to recommend a protocol analysis solution that uses open source software and works with the Linux platform. It must provide decoding of 802.11ac frames and minimal support for reporting and statistics.
What solution would you recommend?

A. Wireshark

B. OmniPeek

C. Wi-Fi Analyzer Pro

D. CommView for Wi-Fi

正解：A 解答を投票する

出題：9

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

B. 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.

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

D. 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.

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

正解：A,B 解答を投票する

出題：10

Given a protocol analyzer can decrypt WPA2-PSK data packets providing the PSK and SSID are configured in the analyzer software.
When performing packet capture (in a non-FT environment) which frames are required in order for PSK frame decryption to be possible?

A. Probe Response

B. Reassociation

C. 4-Way Handshake

D. Authentication

正解：C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

CWAP-404試験無料問題集「CWNP Certified Wireless Analysis Professional 認定」