최신 CWAP-404 무료덤프 - CWNP Certified Wireless Analysis Professional

문제1

ABC Company is having VoWiFi latency problems on their 802.11g WLAN. A wireless administrator has noticed in the phone's client utilities software that the MAC CRC Error count is higher on stations with problems than on those client stations without problems.
A high MAC CRC Error count is attributable to which of the following? (Choose 3)

A. 2.4 GHz ISM band interference from sources such as wireless video cameras and analog phones

B. Dynamic Rate Switching algorithms that decrease data rates for latency-sensitive applications

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

D. High collision rates due to dense population of voice stations and no admission control

E. Two access points with overlapping coverage on a single channel

F. High multipath conditions due to an RF environment with highly reflective materials

정답: A,D,F

문제2

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 the frames Station-Z is receiving, looking for delayed ACK frames.

B. 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.

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

D. 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.

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

정답: C,D

문제3

Many access points support IEEE 802.1Q VLAN tagging. When analyzing a WLAN system using IEEE 802.1Q tags, where can the VLAN tag number be seen?

A. In the Frame Control field of the MPDU header

B. In the PLCP header's Service field

C. In the Ethernet header on the wired port of the access point

D. In the Beacon Management frame's Capabilities fixed field

E. In the Sequence Control field of the MSDU

정답: C

문제4

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. 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.

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. 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.

정답: C

문제5

What is the purpose of a PHY preamble?

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

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

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

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

정답: A

문제6

With what access category's parameters are WLAN multicast video frames transmitted when the EDCAF is in use by the transmitting station?

A. AC_VO

B. AC_BE

C. AC_VI

D. AC_BK

정답: A

설명: (DumpTOP 회원만 볼 수 있음)

문제7

In a Spectrum Analyzer the Swept Spectrogram plot displays what information?

A. Wi-Fi Device information

B. RF power present at a particular frequency over the course of time

C. Duty cycle in the frequency domain

D. The RF time domain

정답: B

설명: (DumpTOP 회원만 볼 수 있음)

문제8

Using the exhibit as a reference, answer the following.

STA1 sent a data frame to Mesh AP2 destined for a local file server on the same subnet with MAC address 00:11:22:33:44:55. Mesh AP2's mesh forwarding algorithm determined that the frame should be forwarded through Mesh AP1.
In the frame sent from Mesh AP2 to Mesh AP1, what is true of the contents of the MAC header?
(Choose 3)

A. DA = 00:11:22:33:44:55

B. SA = Mesh AP2's MAC Address

C. RA = Mesh AP1's MAC Address

D. TA = STA1's MAC Address

E. From DS = 1

F. To DS = 0

정답: A,C,E

문제9

What is the Extended IFS used in 802.11 contention?

A. When a frame reception begins but the received frame is incomplete or corrupted based on the FCS

B. When the higher data rates are used and you want the fastest medium access times

C. When the lower data rates are used and you want the fastest medium access times

D. When 802.11ac must coexist with 802.11n

정답: D

문제10

After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?

A. SSID elements always have a length of 0

B. The beacon is from a BSS configured to hide the SSID

C. The frame is corrupted

D. This is a common attack on WISP backend SQL databases

정답: B

설명: (DumpTOP 회원만 볼 수 있음)

최신 CWAP-404 무료덤프 - CWNP Certified Wireless Analysis Professional

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