Wireless LAN Administration
Answers, Braindumps (PW0-104)
Thanx to www.examscheets.com
for providing helpful material.Here is my contribution.
QUESTION NO: 1
Which of the following are two statements that best
describe 802.11-1999 (R2003) network operation with
regard to association and re-association processes?
A. When actively scanning for a network to join, clients
transmit Probe Request frames, which contain most of
the same information found in beacons.
B. Access points can ignore stations using a null (blank)
SSID field in their Probe Request frames, but must respond
with a Probe Response frame if a station has a specific
SSID matching their own.
C. In order to provide seamless roaming, some vendors
allow a station to associate with a new access point
while still associated with the old one as long as both
access points are from the same vendor.
D. When a station is in the cell range of multiple access
points, it will associate with an access point that
uses active scanning before associating with an access
point that uses passive scanning.
E. A station cannot attempt to associate with an access
point until that access point authenticates the station.
QUESTION NO: 2
Which of the following is an advantage of using WPA-Personal
as a security solution for 802.11a networks, rather
A. WPA-Personal uses 802.1X/EAP for authentication,
and WEP-128 usespreshared keys.
B. WPA-Personal is based upon IEEE 802.11 industry standards,
but WEP is not.
C. WPA-Personal uses CCMP for encryption, and WEP-128
uses TKIP for encryption.
D. Each station using WPA-Personal uses a unique encryption
key to encrypt data, but WEP-128 stations all use the
same encryption key.
E. Only users that know thepreshared key can view other
stations?encrypted data when WPAPersonal is in use.
With WEP-128, this is not possible.
QUESTION NO: 3
What factors affect the distance that an RF signal can
be effectively received?
A. Transmitting station's antenna type
B. Receiving station's radio sensitivity
C. Fresnel zone blockage
D. Power over Ethernet (PoE) usage
E. Antenna connector type
F. Distance between access points
QUESTION NO: 4
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?
A. Linear Diffusion Loss
B. Signal Attenuation
C. Transmission Obfuscation
D. Fresnel Zone Thinning
E. Azimuth Inflation
QUESTION NO: 5
Given: ABC Company's network administrator was just
asked to install a 5 GHz OFDM bridge link between two
buildings. He connected a WLAN bridge with a 50-ohm
output to a 50- ohm RF coaxial cable. He connected the
other end of the RF coaxial cable to a 25-ohm, 6 dBi
Yagi antennA. What is the maximum VSWR between the WLAN
bridge and the Yagi antenna?
QUESTION NO: 6
Given: Return Loss is the decrease of forward energy
in a system because some of the power is being reflected
back toward the transmitter. What can cause a high return
loss in an RF transmission system?
A. A Voltage Standing Wave Ratio (VSWR) of 1.5:1
B. An impedance mismatch between devices in the RF system
C. Cross-polarization of the RF signal as it passes
through the RF system
D. The use of multiple connector types in the RF system
(e.g. N-type and SMA-type)
E. Low output power at the transmitter and use of a
QUESTION NO: 7
What factor is NOT taken into account when calculating
the System Operating Margin of a pointto- point outdoor
WLAN bridge link?
A. Operating frequency
B. Tx antenna gain
C. Tx power
D. Rx cable loss
E. Antenna height
F. Rx sensitivity
QUESTION NO: 8
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?
QUESTION NO: 9
You are contracted by a local school to wirelessly connect
a mobile classroom to the school's network infrastructure.
You are thinking about positioning a wireless workgroup
bridge at the mobile classroom to create the wireless
connection back to the main building in which the school's
data center is located. What should you take into consideration
prior to deploying a wireless workgroup bridge in this
A. You will need to connect a wireless bridge to the
main building's network infrastructure to make the connection
to the wireless workgroup bridge at the mobile classroom.
B. You will only be able to connect wired devices to
the wireless workgroup bridge and not any wireless client
devices in the mobile classroom.
C. If you connect the wireless workgroup bridge to an
access point at the main building, the access point
will not be able to provide connections to other wireless
client devices during communication with the wireless
D. If you need to use security options such as MAC filtering,
WEP, or WPA-Personal, you will need to use a dedicated
wireless bridge at the mobile classroom instead of the
wireless workgroup bridge.
QUESTION NO: 10
Your companyhas many client devices, some that support
WEP, some that support WPA, and some that support WPA2.
The client devices that support only WEP can be firmware
upgraded to support the TKIP wireless security protocol.
As the wireless administrator at Your company, it is
your responsibility to provide the strongest industry
standard layer-2 security possible while applying a
reliable solution for all devices. Which are two security
measures that you should apply to meet Your company's
requirements? (Choose two)
A. 802.1X/EAP authentication
B. TKIP/RC4 encryption
C. Shared Key authentication
D. CCMP/AES encryption
E. WEP-128 encryption with a passphrase
F. Transport Layer Security (TLS)
QUESTION NO: 11
Given: A 802.11 WLAN transmitter that emits an 80 mW
signal is connected to a cable with 3 dB loss. The cable
is connected to an antenna with a 16 dBi gain. What
is the resultant antenna power output (EIRP)?
QUESTION NO: 12
What factors are required to establish a high quality
2.4 GHz point-to-point RF link at a distance of 3 miles
A. Accurate Link Budget calculations
B. Accurate Earth Bulge calculations
C. System Operating Margin (SOM) of at least 20 dB
D. A minimum antenna gain of 13dBi
E. A Fresnel Zone that is at least 60% clear of obstructions
QUESTION NO: 13
What phrase defines Equivalent Isotropically Radiated
A. Transmitter output power plus attached cable and
B. Transmitter output power only
C. Power supplied to the antenna plus antenna gain
D. Reflected power due to an impedance mismatch in the
E. Power supplied to an RF antenna
QUESTION NO: 14
What term describes the effect of increasing the intensity
of an RF wave when the RF antenna lobe is focused in
a desired direction?
A. Directional Extension
B. Active Amplification
C. Beam Compression
D. Passive Gain
E. Phased Propagation