[Free] Download New Updated (February 2016) CWNP CWNA-106 Practice Tests 51-60

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QUESTION 51

As XYZ Company’s wireless specialist, you have been asked to troubleshoot some unexpected frame patterns in a wireless protocol capture. Your peers explain that the network’s beacon frames are inconsistent. That is, the BSSID is the same for all beacons, but the source address varies between three different addresses. What network configuration would cause this beacon frame behavior?

 

A.

A single AP supports multiple BSSs with different SSIDs

B.

A virtual cell single channel network has been implemented

C.

The beacons are from an IBSS instead of a BSS

D.

Three APs still share the same default configuration.

 

Correct Answer: C

 

 

QUESTION 52

When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

 

A.

VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.

B.

VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.

C.

Legacy Power Save mode was removed in the 802.11ac amendment.

D.

VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.

 

Correct Answer: B

 

 

QUESTION 53

As defined in the 802.11 specification, legacy Power Save requires an inefficient back-and-forth frame exchange process. Due to this ineff
iciency, many WLAN device implementations use a variation of 802.11 Power Save to accomplish the same function. What non-standard power save behavior is used by most Wi-Fi devices in actual legacy Power Save implementations?

 

A.

Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon.

B.

After each beacon, the AP attempts to empty its frame buffer by sending Wake-on-WLAN frames to wake each dozing client.

C.

Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered data.

D.

The Beacon interval is changed from the default 100 time units to 10 or less time units.

E.

Clients send null data frames to the AP and switch the power management bit from 1 to 0 to receive queued data.

F.

Stations send a CTS-to-self frame to the AP with a very long duration period so they ca
n receive all of their buffered data at once.

 

Correct Answer: E

 

 

 

 

 

 

 

QUESTION 54

What term correctly completes the following sentence?

 

In an IEEE 802.11 frame, the IP packet is considered by the MAC layer to be a(n) _________.

 

A.

MAC Service Data Unit (MSDU)

B.

MAC Protocol Data Unit (MPDU)

C.

IP datagram

D.

PLCP Service Data Unit (PSDU)

E.

PLCP Protocol Data Unit (PPDU)

 

Correct Answer: A

 

 

QUESTION 55

What term correctly completes the following sentence?

 

802.11a/b/g used a mandatory 800ns guard interval. 802.11n introduced an optional short 400ns guard interval. Guard intervals (GI) are necessary in OFDM to reduce the likelihood of interference between two consecutive ____________.

 

A.

Frames

B.

Packets

C.

Segments

D.

Bits

E.

Bytes

F.

Symbols

 

Correct Answer: F

 

 

QUESTION 56

Prior to association, what parameter can 802.11 client devices measure and use to select the optimal access point for association?

 

A.

Signal strength of access point beacons received

B.

Proximity to potential access points

C.

Retry rate of probe request and response frames

D.

Average round trip time to reach the Internet DNS server

E.

Average round trip time to reach the IP router

 

Correct Answer: A

 

 

QUESTION 57

In an infrastructure Basic Service Set (BSS), how does the passive scanning process occur?

 

A.

Access points broadcast Beacons on all channels of each radio within the regulatory domain. Nearby client stations record information found in the Beacons for use in the association process.

B.

Client stations broadcast Probe Request frames on all supported channels in the regulatory domain. Nearby access points respond with Probe Response frames. Client stations record information in the Probe Response frames for use in the association process.

C.

Client stations broadcast Probe Request frames on the single channel for which they are programmed. Nearby access points respond on that channel with Probe Response frames. Client stations record information found in the Probe Response frames for use in the association process.

D.

Access points broadcast Beacons on a single channel for which they are programmed. Nearby client stations listen for Beacon frames and record information found in the Beacons for use in the association process.

 

Correct Answer: D

 

 

QUESTION 58

During the discovery and connectivity process, client and AP stations exchange information about their supported data rates. After the association, how do client and AP stations select the supported data rate that will be used to send an 802.11 data frame?

 

A.

During the association, the client and AP agree to use the same transmit rate, but either station can request a change at any time after the association.

B.

The client and AP each choose the optimal data rate to use independently of one another, based on their own measurements related to the RF link.

C.

The client and AP may use different transmit rates, but the AP determines the data rate that will be used by each client station in the BSS.

D.

The client and AP may use different transmit rates, but the client determines the data rate that it will use and the data rate that the AP will use when communicating to the client.

E.

The client and AP may use a different transmit rates, but the transmit rate is determined by the peer station, based on the peer’s experience of the RF link.

 

Correct Answer: B

 

 

QUESTION 59

As a station moves away from the access point to which it is associated, it changes its data rate from 600 Mbps to 540 Mbps and then to 450 Mbps. What IEEE 802.11 term is used to describe this functionality?

 

A.

Dynamic Rate Switching

B.

Multirate Control

C.

Modulation and Coding Selection

D.

Rate Set Selectivity

E.

Adaptive Rate Management

 

Correct Answer: A

 

 

QUESTION 60

What statement about the IEEE 802.11e QoS facility is true?

 

A.

802.11 QoS is achieved by giving high priority queues a statistical advantage at winning contention.

B.

Four 802.1p user priorities are mapped to eight 802.11 transmit queues.

C.

When the Voice queue has frames awaiting transmission, no data will be transmitted from the Best Effort queue.

D.

To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.

E.

802.11 control frames are assigned to the 802.11 EF priority queue.

Correct Answer: A

 

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