最新的CWNP PW0-205免費考試真題

問題1

An Announcement Traffic Indication Message (ATIM) frame is used by stations operating in an IBSS to notify other stations of their intention to transmit data. Which fixed fields and information elements does the ATIM frame include?

A. Capability Information and Timestamp

B. IBSS Parameter Set and Status Code

C. The ATIM contains no fixed fields or information elements

D. Challenge Text and Authentication Algorithm

E. SSID and Supported Rates

正確答案: C

問題2

The Timestamp field, found in 802.11 Beacon Management frames, is 8 bytes in length and serves which of the following purposes?

A. Keeps all client stations in a BSS synchronized to within approximately 4 microseconds of the access point.

B. Allows client stations in the IBSS to pick the best of multiple beacons.

C. Allows all client stations in a BSS to calculate how long it took for the Beacon Management frame to traverse the wireless medium.

D. Informs associating client stations how often to expect Beacon Management frames to be sent by the access point.

E. Used to notify client stations using power management features of how long their queued frames have been held by the access point.

正確答案: A,B

問題3

Some protocol analyzers have the ability to capture only MAC frame headers (sometimes called packet slicing), and others have the ability to update the capture display without saving the frames permanently (sometimes called stumbling mode). What are advantages of using these two features of a wireless protocol analyzer?

A. Analyzers can be left running for long periods of time without running out of frame buffer space.

B. Analyzers with a small amount of frame buffer memory can be used.

C. Analyzers can use DRAM to store captured frames instead of storing files on a hard drive.

D. Capturing, analyzing, and discarding headers allows more CPU cycles for real-time decoding and analysis.

E. Analyzers can capture traffic on more channels simultaneously due to decreased overhead per channel.

正確答案: A,B

問題4

In the 802.11 series of wireless LAN standards, there is a medium access rule regarding formatting of preambles in response to MMPDUs. What does this rule state?

A. The rule states that short preambles should be used in response-MMPDUs until a single station associates to the BSS using the long-preamble format, after which, only long preambles are used.

B. The rule states that only short preambles may be used in response-MMPDUs regardless of any other factor.

C. The rule states that a response-MMPDU must be sent with the same type of preamble as the request-MMPDU that triggered the response-MMPDU.

D. The rule states that only long preambles may be used in response-MMPDUs regardless of any other factor.

E. The rule states that if a mixed set of stations (long/short preamble settings) are associated to the access point, only long preambles may be used for response-MMPDUs.

正確答案: C

問題5

Access points act as translational bridges (portals), bridging traffic between 802.11 and
802.3 networks. What two specifications are used most often by access points to perform this frame translation?

A. 802.3z

B. RFC 1042

C. 802.11d

D. 802.1H

E. RFC 2002

正確答案: B,D

問題6

ABC Company is having throughput problems on their 802.11b wireless LAN. A wireless administrator has noticed in the wireless client station utilities that the MAC CRC Error count is higher on stations with problems than those client stations without problems. A high MAC CRC Error count is NOT attributable to which of the following?

A. 2.4 GHz ISM band interference from sources such as wireless phones

B. Collisions due to dense population of client station adapters

C. Co-located PCF and DCF mode access points that are using non-overlapping 2.4 GHz channels

D. Overlapping access point coverage on a single channel

E. High multipath conditions due to bounced signals

正確答案: C

問題7

An administrator for ABC Company has noticed an intermittently high number of retransmissions on their purely 802.11g wireless LAN coming from some of the access points near the break room, especially when wireless stations are using the FTP protocol to pull down large sales report data files from the company's FTP server. The administrator decides to hire a consultant to test some configuration changes hoping to improve performance of the wireless LAN. As the consultant, what test do you recommend performing?

A. Change the DTIM interval in all access points near the break room to a shorter interval.

B. Set all supported data rates on the access points near the break room to Basic

C. Enable support of short preambles on all access points near the break room.

D. Decrease the output power on all access points and stations throughout the ESS to form smaller cells in case there is a hidden node.

E. Change the fragmentation threshold value on all access points near the break room to a smaller value.

正確答案: E

問題8

Which features of a wireless LAN protocol analyzer allow troubleshooters to monitor network events that are happening while the troubleshooters are not watching the analyzer user interface?

A. Notifications

B. Alarms

C. Trending Analysis

D. Peer Map

E. Event Triggers

F. Node Statistics

正確答案: A,B,E

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