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CWNA-106
Certified Wireless Network Administrator Questions and Answers

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Viewing questions 21-30 out of questions

Questions # 21:

You are onsite with a client to perform a post-deployment site survey. When verifying a multiple channel VoWiFi deployment using a VoWiFi handset, which aspect is most important?

Options:

Performing protocol analysis with a single wireless adapter that is scanning all channels in use

Testing a constant conversation or handset tone while roaming from area to area, or performing an active survey

Configuring DSCP-to-802.11e QoS maps on the handset for each access category.

Verifying the VHT functionality to handle the call volume incurred by a single VoIP phone call.

Answer

Questions # 22:

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

Options:

Data frames too large for the physical environment

Client stations broadcasting with too much power

Access points broadcasting with too little power

Client stations too close in proximity to each other

Obstacles between client stations causing attenuation

Large 802.11 cells with physically distributed stations

Answer

E, F

Questions # 23:

ABC Company performs government contract work that requires disabling WLANs and has recently purchased an 802.11 Wireless Intrusion Prevention System (WIPS) to enforce their “NO WIRELESS” network security policy.

What attack type cannot be recognized by the WIPS?

Options:

Deauthentication

Rogue APs installation

Layer 3 DoS

Packet capturing

RF jamming

Answer

Questions # 24:

A WLAN transmitter that emits a 200 mW signal is connected to a cable with 3 dB loss.

If the cable is connected to an antenna with 10 dBi gain, what is the EIRP at the antenna element?

Options:

10 dBm

13 dBm

20 dBm

26 dBm

30 dBm

Answer

Questions # 25:

In a single channel architecture (SCA) WLAN system, 802.11n (HT) APs should not share an SSID with 802.11g (ERP) APs.

What is the reason for this recommendation?

Options:

Client stations would see two different sets of AP capabilities as they roam between APs with the same BSSID.

The added range of 802.11n APs would cause additional co-channel interference.

The additional beacon material in 802.11n beacons would confuse 802.11b/g client stations.

Beacons from 802.11n APs use 40 MHz channels, while beacons from 802.11g APs use 20 MHz channels.

Answer

Questions # 26:

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

Options:

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.

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.

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.

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.

Answer

Questions # 27:

The network administrator at XYZ Company recently attended a training class on wireless security and realized that he should update the corporate security policy to address WLAN technology. The network administrator is listing the items that should be addressed in the security policy update, and has asked for your input.

What WLAN topics should be addressed by a company security policy? (Choose 3)

Options:

Theft prevention and data security of WLAN infrastructure devices

Wireless intrusion monitoring and response procedures

WLAN performance analysis baseline documentation

Wired network performance analysis and baseline documentation

Training of the IT staff on WLAN operational security

User density planning and AP client association thresholds

Answer

A, B, E

Questions # 28:

What is a common feature of an 802.11 WLAN client utility? (Choose 2)

Options:

Real-time retry monitor

AP Signal strength meter

Spectrum analyzer utility

VLAN configuration

Link statistics display

Answer

B, E

Questions # 29:

What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)

Options:

Predictive modeling software can predict the ideal access point location 100% of the time, whereas the results from manual surveying are less reliable.

Predictive modeling software makes it simple to assess multiple different AP locations and then adjust and display the AP’s expected coverage pattern in almost real-time.

Predictive modeling software provides more reliable data than manual surveys when fine-tuning and validating access point placement after the installation.

The exact impact of interference sources from external networks can be more accurately measured when using predictive modeling software than with manual surveys.

It takes less time to create an initial site survey for a large facility when using predictive modeling software than when performing a manual survey.

Answer

B, E

Questions # 30:

Which unit of measurement is an absolute unit that is used to quantify power levels on a linear scale?