PW0-104 - Wireless LAN Administration
Go back to CWNP - Certified Wireless Security Professional
Given: The 802.11-2007 standard often refers to Association and Reassociation frames as a set by saying, "(Re)Association." What is one difference between these two frame types?
The Reassociation frame contains an additional field called the Current AP Address.
When performing an RF site survey for a WLAN system deployment that will include VoWiFi handsets, what special technique should be considered?
The number of directional antennas should be maximized to reduce the noise floor and co-channel interference.
What problems exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? Choose 2
Mismatched transmission amplitudes between VoWiFi handsets and APs can cause poor quality calls.
WLAN system capacity can be reduced due to co-channel interference.
Your company hires you to troubleshoot their 802.11abgh-compliant, Wi-Fi-certified access point and wireless client devices. Subsequent to carrying out a site survey, you identify five neighboring 802.11b access points that belongs to your company; one on channel 1, three on channel 6, and one on channel 11. What is the most appropriate change that is recommended to best circumvent co-channel and adjacent channel interference?
Configure Company's access point to use 802.11a with dynamic frequency selection (DFS).
Which of the following is an advantage of using WPA-Personal as a security solution for 802.11a networks, rather than WEP-128?
Each station using WPA-Personal uses a unique encryption key to encrypt data, but WEP-128 stations all use the same encryption key.
How many HR/DSSS channels are specified by the IEEE 802.11-2007 standard, without reference to a specific governmental regulatory domain?
Given: You are being interviewed by ABC Company for a possible position as a wireless site survey engineer. The interviewing manager asks you what items should be included in a manual RF site survey report. What is your response? Choose 2
RF heat map illustrating coverage for each frequency band
Documentation noting where each access point will be placed and how it will be mounted
What are two appropriate IEEE 802.11-1999 (R2003) stipulations with regard to DSSS technology? Choose 2
Minimum transmit power should be no less than 0 dBm.
A basic data rate and an enhanced data rate are specified for the 802.11 DSSS physical layer.
When verifying a VoWiFi deployment site survey using a VoWiFi handset, which aspect is most important?
Holding the handset vertically while recording signal strength and data rate
What phrase defines Equivalent Isotropically Radiated Power (EIRP)?
Power supplied to the antenna plus antenna gain
Which two of the following statements pertaining to 802.11-compliant systems and co- located access points are accurate? Choose 2
The same number of 802.11b systems and 802.11g systems can be co-located in the 2.4 GHz ISM band without adjacent channel interference.
Up to four 802.11a access points in the 5.15 ?5.25 GHz U-NII band can be co-located without performance degradation.
Given: ABC Company has hired you to perform an indoor site survey of their 7-story facility. ABC Company rents out unused space in their building to other companies, and the other companies use 802.11 WLANs already. ABC Company wants all of the offices they occupy to be surveyed as part of the project. What actions should be recommended as part of the site survey project? Choose 2
Find out if ABC Company's Ethernet switches support PoE.
Locate wiring closets on each floor of ABC Company's building.
As an RF wave propagates through space, the wave front experiences natural expansion. What is the detrimental effect of this expansion in a WLAN system?
What conditions can prevent an 802.11 client device from performing a fast BSS transition between two access points that are part of the same WLAN system? Choose 2
One access point has reached its admission control limit.
The client's role-based profile on the WLAN controller does not allow the client to use specific access points on the network.
What are two BSS modes specified the 802.11 Clause 20 (High Throughput) PHY? Choose 2
What items are essential for performing a manual RF site survey for a warehouse facility? Choose 2
A facility map of where users will and will not go
An understanding of typical data transactions
Given: XYZ Company is planning to install a new 802.11 WLAN, but wants to upgrade its wired infrastructure first to provide the best user experience possible. XYZ has hired you to perform the RF site survey. During the interview with the network manager, you are told that the new Ethernet edge switches will support VoIP phones and 802.11 access points, both using 802.3-2005, Clause 33 compliant PoE. After hearing this information, what immediate concerns do you note?
The power budget in the edge switches must be carefully planned and monitored.
ABC Company has a 5 GHz WLAN deployment using the UNII-2 and UNII-2e bands. DFS functionally is enabled as required by the regulatory domain. A VoWiFi station is associated to AP1, which is using channel 52. After detecting a radar signature on channel 52, AP1 sends a channel switch announcement and moves to channel 60. The VoWiFi station doesn't receive the channel switch announcement. What is most likely to occur as a result of this scenario?
An increase in frame retransmissions, causing voice latency
When using 802.3-2005, Clause 33 compliant Power-over-Ethernet switches at the network edge, what situation has the potential to adversely affect the proper operation of your Clause 33 compliant access points?
A large number of Clause 33 compliant VoIP phones are attached to the same Ethernet switch.
While working in a conference room equipped with a wireless network on a presentation document, you notice that turning your laptop in different directions results in your wireless signal strength changing. This change in signal strength is primarily caused by which RF signal property?
The RF signal's polarization is different than the receiving antenna.
Given: The network administrator at XYZ Company recently attended a training class on wireless security and realized that he still needs to update the corporate security policy to address WLAN technology. The network administrator is trying to remember some of the items that should be addressed in the security policy update, and has asked you to help. What topics would you suggest for the security policy update? Choose 4
Physical security of WLAN infrastructure devices
Wireless intrusion monitoring and response procedures
Strong password requirements for users and infrastructure equipment
Training of the IT staff on WLAN operational security
What device feature is user configurable for RSN-capable 802.11 WLAN client devices?
EAP Authentication Type
Given: A WLAN transmitter that emits a 200 mW signal is connected to a cable with a 9 dB loss. if the cable is connected to an antenna with a 10 dBi gain, what is the EIRP at the antenna element?
What is the most common mount type for connecting a WLAN antenna to an outdoor mast (pole)?
U-bolt with base clamp
What word describes the bending of an RF signal as it passes between mediums of different density?
Given: John configures ten IEEE 802.11 dual-band ERP / OFDM laptops in a conference room for Ad Hoc wireless networking. One laptop is connected to the Ethernet network, and its Ethernet and WLAN interfaces are bridged. All ten laptops are now able to obtain an IP address from the organization's DHCP server, resolve DNS queries, and reach web servers on the Internet. Is this WLAN an Independent Basic Service Set (IBSS) or an Infrastructure Basic Service Set (BSS)?
IBSS because all laptops are configured for Ad Hoc mode connectivity
What causes an excessively high Voltage Standing Wave Ratio (VSWR) in an 802.11 WLAN?
An impedance mismatch between devices in series with the main RF signal
What statements describe the RF cables and connectors that are used with 802.11 WLAN equipment? Choose 3
RF cables have upper and lower frequency limit specifications
Two like connectors, manufactured by different companies, may vary in their specifications.
Every RF connector has insertion loss.
Which of the following is the data rate that is specified in the 802.11g amendment, but not in the 802.11a amendment to the IEEE 802.11-1999 (R2003) standard?
When is an ERP-OFDM access point required by the IEEE 802.11 standard to respond to Probe Request frames from nearby High Throughput (HT) stations? Choose 2
When the Probe Request frames contain the correct SSID value
When the Probe Request frames contain a blank SSID value
In a single channel architecture (SCA) WLAN system, 802.11n (High Throughput) APs should not share an ESSID with 802.11g (ERP-OFDM) APs because _________.
Client stations could lose services as they roam between APs with the same BSSID
Given: As your station moves away from the access point to which it is associated, it changes its data rate from 54 Mbps to 48 Mbps and then to 36 Mbps. What IEEE 802.11 term is used to describe this functionality?
Dynamic Rate Switching
Devices compliant with the IEEE 802.11-2007 standard use which radio brands? Choose 4
5.725 - 5.875 GHz ISM band
2.4000 - 2.4835 GHz ISM band
5.470 - 5.725 GHz UNII band
5.15 - 5.25 GHz UNII band
An ERP-OFDM access point can control use of the RF medium for a specified period of time using which of the listed components of the IEEE 802.11-2007 standard?
Which of the following are two statements that best describe 802.11-1999 (R2003) network operation with regard to association and re-association processes?
When actively scanning for a network to join, clients transmit Probe Request frames, which contain most of the same information found in beacons.
A station cannot attempt to associate with an access point until that access point authenticates the station.
ABC Company is opening a new branch office that needs an 802.11 WLAN to support a mission critical application. The IT manager has considered implementing a remote office WLAN controller with controller-based APs instead of several autonomous APs. He has asked you about the primary differences between the two solutions. What statements define characteristics of WLAN controllers? Choose 2
Controller-based APs download their firmware and configuration from the WLAN controller upon initialization, thus reducing management overhead.
If a WLAN controller is used, all attached controller-based APs must use the same WLAN profiles.
Given: XYZ Company is constructing a building-to-building ERP-OFDM bridge link using patch antennas. The buildings are 4 blocks apart in the middle of a large city. XYZ Company is using the rooftop of each building for antenna placement. There are several buildings closely spaced between the two locations, but there is a narrow visual line-of-sight. The link does not work as XYZ Company had hoped. What would you do to rectify this problem at the lowest possible cost?
On top of each building, place a mast or tower that is tall enough to completely clear the Fresnel Zone of obstructions between the two antennas.
What statements about 802.3-2005, Clause 33 (Power-over-Ethernet) are true? Choose 2
If a dual-radio access point requires 11 W to operate, a Clause 33 compliant endpoint switch allocates 15.4 W to the powered interface.
Clause 33 compliant endpoint PSE devices may source power of 44 57 VDC on the active data wires or the spare copper pairs.
What statement about 802.11 WLAN performance is true?
Larger frame sizes result in greater throughput in a low RF interference environment.
Given: XYZ Corporation is experiencing connectivity problems with their existing building-to-building bridge link. A block wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many frames. The administrator moves the antenna to an area not obstructed by the block wall and then realizes the RF cable cannot reach the new location. if an extension cable is used, what are the likely results? Choose 2
The Equivalent Isotropically Radiated Power (EIRP) will decrease.
The antenna coverage area will decrease.
Given: ABC Company is opening a new branch office that needs an 802.11 WLAN to support a mission-critical application. The IT manager has considered implementing a remote office WLAN controller with lightweight access points instead of several autonomous access points. He has asked you about the primary differences between the two solutions. What statements define characteristics of WLAN controllers? Choose 2
Lightweight access points download their firmware and configuration from the WLAN controller upon initialization, thus reducing management overhead.
All lightweight access points support 802.3-2005, Clause 33 PoE, and some lightweight access points support the 802.3at PoE Plus standard.
According to the 802.11-2007 standard, when is an ERP-OFDM access point required to respond to Probe Request frames from High Throughput (HT) stations? Choose 2
Only when the Probe Request frames contain a blank SSID value
Only when the Probe Request frames contain the correct SSID value
In an Infrastructure Basic Service Set (BSS), what best describes the Passive Scanning process?
Access points broadcast Beacons on all channels on each radio within the regulatory domain. Nearby stations record information found in the Beacons for use in the association process.
How far apart are the center frequencies of the OFDM channels specified for use in the UNII-2 band (5.25 5.35 GHz)?
In an 802.11 OFDM Basic Service Set (BSS), what prevents each station from using the full network bandwidth (54 Mbps) when multiple stations are actively transmitting and receiving within the BSS? Choose 2
Use of a distributed coordination function containing a backoff algorithm
WLAN devices operate in a half duplex medium
What facts are true regarding controllers and APs in a Split MAC architecture? Choose 2
With 802.1X/EAP security, the AP acts as a supplicant
Preauthentication support is required for fast/secure roaming.
What factors are required to establish a high quality 2.4 GHz point-to-point RF link at a distance of 5 miles (5 kilometers)? Choose 2
Accurate Link Budget calculations
A Fresnel Zone that is at least 60% clear of obstructions
Given: ABC Company has hired you to perform an initial site survey on their facility. During an interview the network manager informs you that the new wireless network must use UNII bands and OFDM, and VoWiFi handsets will be used extensively over the wireless network. What items do you need to include in the RF site survey report? Choose 2
A heat map illustrating coverage for areas where mobile users may roam
VoWiFi handset connectivity test results
What statements define the contents of a manual RF site survey report? Choose 2
It contains the results from the RF coverage, capacity, and interference analysis.
It states the customer requirements and business justification for the WLAN.
Which of the following are three items that are specified by or derived from the IEEE 802.11i wireless LAN security amendment? Choose 3
CCMP / AES