CWNA-106 Online Practice Questions and Answers

What features were introduced in the IEEE 802.11h amendment in order to uphold regulatory requirements for 5 GHz operation? (Choose 2)

A. 256-QAM

B. DistributedCoordination Function (DCF)

C. Phase Shift Keying (PSK)

D. Transmit Power Control (TPC)

E. Radio Resource Management (RRM)

F. Dynamic Frequency Selection (DFS)

AP-1 is a 3x3:2 AP. STA-3 is a 3x3:3 client. What is the maximum number of spatial streams that can be used for a downlink HT-OFDM transmission from AP-1 to STA-3?

A. One spatial stream, because the definition of the AP indicates that it is capable of only one spatial stream.

B. Three spatial streams, because the definition of the client indicates that it is capable of only three spatial streams.

C. Two spatial streams, because the definition of the AP indicates that it is capable of only two spatial streams.

D. Three spatial streams, because the definition of the AP indicates that it is capable of only three spatial streams.

ABC Company is planning toinstall a new 802.11ac WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. ABC Company has hired you to perform the RF site survey. During the interview with the network manager, you are told that the newEthernet edge switches will support VoIP phones and 802.11 access points, both using 802.3 PoE. After hearing this information, what immediate concerns do you note?

A. VoIP phones and 802.11 access points should not be powered by the same edge switch dueto distortion.

B. The edge Ethernet switches should support Ether-channel to get the best results out of the network.

C. If the switches are in optimal locations for VoIP phones, they are likely to be suboptimal locations for

802.11 APs.

D. The power budget in the edgeswitches must be carefully planned and monitored based on the number of supported PoE devices.

As an RF wave propagates through space, the wave front experiences natural expansion that reduces its signal strength in an area.What term describes the rate at which this expansion happens?

A. MU-MIMO

B. Inverse square law

C. Fresnel zone thinning

D. Ohm's law

What problems may occur when there are hidden nodes in the BSS?

A. Increase in downlink (transmitted by AP) frame retries.

B. High retransmission count for a subset of client stations.

C. Use of frame fragmentation with fragment bursts.

D. Excessive use of null data frames.

E. Duration values vary widely in each data frame.

What HT technology requires MIMO support on both the transmitter and receiver?

A. Spatial multiplexing

B. Shot guard intervals

C. Maximal ratio combining

D. Orthogonal Frequency Division Multiplexing

What causes of hidden nodes within a BSS would be more likely lead to an increase in collisions and retries? (Choose 2)

A. Data frames too large for the physical environment

B. Client stationsbroadcasting with too much power

C. Access points broadcasting with too little power

D. Client stations too close in proximity to each other

E. Obstacles between client stations causing attenuation

F. Large 802.11 cells with physically distributed stations

What problems may exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? (Choose 2)

A. Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance.

B. WLAN client stations can experience the hidden node problem when located near each other within the same cell.

C. The mismatched power between WLAN client stations and APs violates regulatory and IEEE signal quality requirements.

D. Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.

E. APs operating in the 2.4 GHz band wouldprevent microwave ovens and analog video cameras from functioning.

ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous)

802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?

A. The RADIUS server

B. All non-root bridges

C. A designated non-root bridge

D. The root bridge

E. The Ethernet switch

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'sbeacon 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 withdifferent 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.