CWNA-106 Online Practice Questions and Answers

In an 802.11n 2.4 GHz BSS, what prevents each station fromusing the full network bandwidth (e.g. 130 Mbps) for user data throughput when multiple clients are actively exchanging data with the AP?

A. Radio receiver hardware cannot process data as quickly as it can be transmitted.

B. Half of the bandwidth is allocated to uplink traffic and half to downlink traffic.

C. WLAN devices cannot detect collisions and must receive positive frame acknowledgment.

D. APs do not have sufficient wired connection speeds to the LAN, even at 1 Gbps connections with 802.11n and earlier APs.

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.

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

A. 802.11 QoS is achieved by giving highpriority queues a statistical advantage at winningcontention.

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. Toimprove efficiency, Block Acknowledgments arerequired for Voice and Video WMM queues.

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

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.

Return Loss is the decrease of forward energy in a system when some of thepower is being reflected back toward the transmitter.

What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?

A. A Voltage Standing Wave Ratio (VSWR) of 1:1

B. An impedance mismatch between components in the RF system

C. The use of cables longer than onemeter in the RF system

D. High output power at the transmitter and use of a low-gain antenna

What phrase defines Equivalent Isotropically Radiated Power (EIRP)?

A. The power output from theradio into the RF cable

B. The power output from the radio after cable losses

C. Thehighest RF signal strength that is transmitted from a given antenna

D. Power supplied from the transmission line to the antenna input

In addition to coverage analysis results, what should be included in a site survey report to ensure WLAN users experience acceptable performance?

A. Application Layer protocol availability analysisresults

B. Layer 4 protocol availability analysis results

C. Capacity analysis results

D. WAN interface analysis results

In a Wi-Fi client configuration utility, what feature is most likely to be user configurable?

A. 802.1p to WMM mappings

B. SNMPv3 Users

C. WMM-PS Dozing Interval

D. RADIUS Server IP Address

E. EAP Authentication Type

What is alwaysrequired to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?

A. Minimum output power level of 2 W

B. Grid antennas ateach endpoint

C. A minimum antenna gain of 11 dBi at both endpoints

D. A Fresnel Zone that is at least 60% clear of obstructions

You are using a tool that allows you to see signal strength for all APs in the area with a visual representation. It showsyou SSIDs available and the security settings for each SSID. It allows you to filter by frequency band to see only 2.4 GHz networks or only 5 GHz networks. No additional features are available. What kind of application is described?

A. Site survey utility

B. Protocol analyzer

C. Spectrum analyzer

D. WLAN discovery tool