PW0-270試験無料問題集（60題）「CWAP Certified Wireless Analysis Professional 認定」

出題：1

What IEEE 802.11 technology is illustrated by the exhibit?

A. TCP Fragment Bursting

B. A-MSDU

C. U-APSD

D. Fragmentation

E. Jumbo frames

F. A-MPDU

正解：B 解答を投票する

出題：2

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：3

In the frame decode shown, there are two sets of supported data rates. 1, 2, 5.5, and 11 Mbps are all shown as "basic" data rates, and 6, 9, 12, 18, 24, 36, 48, and 54 Mbps are shown simply as supported data rates.

What is true of "basic" data rates in this context?

A. Basic rates are defined in an AP's service set to specify mandatory data rates for all retry frames.

B. Basic rates are only used for multicast traffic, and do not affect unicast traffic.

C. The AP requires all client stations to support Basic rates in order to associate to its BSS.

D. The highest data rate set to Basic is automatically used to send broadcast traffic such as Beacon frames.

E. Basic rates are optional data rates for the BSS, often used for assuring connectivity for legacy stations.

正解：C 解答を投票する

出題：4

How long, in microseconds, is the required Slot Time that is announced by an AP in an HT BSS when HR/DSSS, ERP-OFDM, and HT-OFDM client stations are associated to the AP?

A. 4 (us)

B. 20 (us)

C. 9 (us)

D. 10 (us)

E. 2 (us)

正解：B 解答を投票する

出題：5

An HT STA does not receive an ACK for a first-attempt data frame that it transmitted. Assuming this STA is not using BlockAcks in this case, what happens to the HT STA's EDCA contention window?

A. It varies because the backoff algorithm is random.

B. The contention window is immediately closed, and the frame is retransmitted.

C. The contention window is not affected by failed Data frame delivery.

D. The contention window approximately doubles in size.

E. The slot time within the contention window decreases by 50%.

正解：D 解答を投票する

出題：6

Why is a high CRC error rate in L2 protocol analysis software NOT always a valid indicator of network performance? (Choose 3)

A. If the protocol analysis radio hardware is not located in the same area as intended client devices or APs, its data sampling may not be representative of actual traffic on the network.

B. If protocol analysis software is not properly configured with frame decryption parameters, it can't accurately calculate a CRC, which includes the encrypted frame body contents.

C. Radio and antenna hardware used for protocol analysis may not match the receive sensitivity, diversity, MIMO, or antenna gain capabilities of the network WLAN hardware.

D. Layer 2 protocol analysis can only collect and interpret data that is received properly at the MAC layer, and cannot quantify some PHY-layer problems.

正解：A,C,D 解答を投票する

PW0-270試験無料問題集「CWAP Certified Wireless Analysis Professional 認定」