CWNP Certified wireless analusis professional(cwap) 認定 PW0-205 試験問題:

1. Which of the following must be true before an 802.11 station may transmit a frame on the RF medium using DCF mode?

A) A time period of at least DIFS must have passed.
B) The Network Allocation Vector must be equal to zero.
C) A time period of at least PIFS must have passed.
D) All collision arbitration must be completed on the RF medium.
E) The Backoff Timer must be equal to zero.
F) The station must have received a PS-Poll frame from the access point.

2. The 802.11 standard allows for frame fragmentation due to an unreliable medium. Which two fields in the 802.11 frame are involved in numbering data frame fragments and notifying the receiving station when all of the fragments of a data frame have been received?

A) DS Parameter field
B) Capability Information field
C) Ordered Service field
D) ERP Information field
E) Frame Control field
F) Sequence Control field

3. An 802.11b PPDU's preamble consists of two fields and can collectively be considered
"long" or "short" by the 802.11b standard. Which of the following is true regarding the PLCP preamble?

A) When short preambles are being used, the Sync and SFD fields both consist of 16 bits.
Only access points have configurable preamble lengths.
B) Long and short preamble lengths are both variable depending on the modulation in use on the network, and access points always inform stations of the preamble length in use on the network.
C) 802.11g stations associating to 802.11b access points must use the DSSS preamble length specified by the access point.
D) A long preamble uses a Sync field of 128 bits, and both stations and access points may have configurable preamble lengths.
E) An 802.11b access point that supports both long and short preambles may allow stations that are using different preamble lengths to communicate through it simultaneously.
F) A short preamble uses a Sync field of 40 bits, and stations and access points must have matching preamble lengths in order to communicate.

4. An 802.11b client station, sends a single 600 byte MSDU to another 802.11b client station while operating as part of an unsecured infrastructure BSS. Due to thresholds set on all client stations and the access point, all MPDUs over 300 bytes in length invoke the RTS/CTS protocol. How many individual CTS frames are transmitted on the wireless medium as part of the entire process of moving the 600 byte MSDU between the two client stations?

A) 4
B) 1
C) 2
D) 3

5. XYZ Company is using a single 802.11g access point in their New York branch office.
There are ten 802.11g wireless client stations currently on the network, each used by XYZ full-time employees. XYZ has hired a consultant to work on some accounting problems, and he is using an 802.11b radio card in his laptop. How might this affect XYZ wireless LAN throughput?

A) There will be no affect on the wireless LAN throughput capacity since the access point talks to each station at the highest rate at which the station is capable of transmitting.
B) The network throughput capacity will be greatly decreased, and each 802.11g client station must begin using 20 us slot times.
C) The network throughput capacity will decrease slightly since the only change will be that the 802.11b client station will transmit at 11 Mbps instead of 54 Mbps.
D) The network throughput capacity will remain unchanged, but the 802.11b client station will slow access down for the 802.11g stations.
E) The network throughput capacity will greatly decreased due to mandatory use of DSSS- OFDM modulation.

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