345-1
This is your description.
- 1.
Which layers of the OSI model are referenced in the 802.11 standard? (choose two)
- A.
Application
- B.
Data-Link
- C.
Presentation
- D.
Physical
- E.
Transport
- F.
Network
Correct Answer(s)
B. Data-Link
D. Physical -
- 2.
Which of the following are valid ISM bands? (choose three)
- A.
902-928 MHz
- B.
2.4-2.4835 GHz
- C.
5.725-5.825 GHz
- D.
5.725-5.875 GHz
Correct Answer(s)
A. 902-928 MHz
B. 2.4-2.4835 GHz
D. 5.725-5.875 GHz -
- 3.
Which technologies are used in the 2.4 GHz ISM band? (Choose all that apply)
- A.
FHSS
- B.
ERP
- C.
DSSS
- D.
HR-DSSS
Correct Answer(s)
A. FHSS
B. ERP
C. DSSS
D. HR-DSSS -
- 4.
802.11 draft (HT clause 20 radios) can transmit in which frequency bands? (Choose three that apply)
- A.
. 2.4-2.4835 GHz
- B.
5.47-5.725 GHz
- C.
902-928 GHz c. 902
- D.
5.15-5.25 GHz
Correct Answer(s)
A. . 2.4-2.4835 GHz
B. 5.47-5.725 GHz
D. 5.15-5.25 GHz -
- 5.
In North America, the 802.11 standard designates what frequency space for use of FHSS transmissions?
- A.
2.2 GHz - 2.4835 GHz
- B.
2.402 GHz - 2.480 GHz
- C.
30 5.725 GHz - 5.825 GHz
- D.
5.725 GHz - 5.875 GHz
- E.
None of the above
Correct Answer
B. 2.402 GHz - 2.480 GHz -
- 6.
The original 802.11 amendment requires how much separation between center frequencies for DSSS channels to be considered non-overlapping?
- A.
22 MHz
- B.
25 MHz
- C.
30 MHz
- D.
35 MHz
- E.
40 MHz
Correct Answer
C. 30 MHz -
- 7.
The 802.11-2007 standard requires how much separation between center frequencies for HR-DSS (clause 18) channels to be considered nonoverlapping?
- A.
22 MHz
- B.
25 MHz
- C.
30 MHz
- D.
35 MHz
- E.
40 MHz
Correct Answer
B. 25 MHz -
- 8.
What best describes "hop time"?
- A.
The period of time that the transmitter waits before hopping to the next frequency
- B.
The period of time that the standard requires when hopping between frequencies
- C.
The period of time that the transmitter takes to hop to the next frequency
- D.
The period of time the transmitter takes to hop through all of the FHSS frequencies
Correct Answer
C. The period of time that the transmitter takes to hop to the next frequency -
- 9.
) As defined by the 802.11g amendment, how much separation between center frequencies is needed between center frequencies of channels in the UNII-2 Extended band?
- A.
10 MHz
- B.
20 MHz
- C.
22 MHz
- D.
25 MHz
- E.
30 MHz
Correct Answer
B. 20 MHz -
- 10.
When deploying an ERP-OFDM wireless network with only two access points, which of these channel groupings would be considered nonoverlapping (Choose two)
- A.
Channels 1 and 3
- B.
Channels 7 and 10
- C.
Channels 3 and 8
- D.
Channels 5 and 11
- E.
Channels 6 and 10
Correct Answer(s)
C. Channels 3 and 8
D. Channels 5 and 11 -
- 11.
Which spread spectrum technology specifies data rates of 22 Mbps and 33 Mbps?
- A.
DSSS
- B.
ERP-PBCC
- C.
OFDM
- D.
PPtP
Correct Answer
B. ERP-PBCC -
- 12.
) If data is corrupted by previous data from a reflected signal, this is known as what?
- A.
Delay spread
- B.
ISI
- C.
Forward error creation
- D.
Bit crossover
Correct Answer
B. ISI -
- 13.
Assuming all channels are supported by a 5 GHz access point, how many possible channels can be configured on the access point?
- A.
4
- B.
11
- C.
12
- D.
24
Correct Answer
D. 24 -
- 14.
Which of these technologies is the most resilient against the negative effects of multipath?
- A.
FHSS
- B.
DSSS
- C.
HR-DSSS
- D.
OFDM
Correct Answer
D. OFDM -
- 15.
HR-DSSS (clause 18) calls for data of 5.5 Mbps and 11 Mbps. What is the average amount of aggregate throughput percentage at any data rate?
- A.
80 percent
- B.
75 percent
- C.
50 percent
- D.
100 percent
Correct Answer
C. 50 percent -
- 16.
In an FHSS system, throughput can be increased by which of the following?
- A.
Shortening the dwell time and lengthening the hop time
- B.
Shortening the dwell time and shortening the hop time
- C.
Lengthening the dwell time and shortening the hop time
- D.
Lengthening the dwell time and lengthening the hop time
Correct Answer
C. Lengthening the dwell time and shortening the hop time -
- 17.
With the center frequency of channel 1 at 2.412 GHz, what is the center frequency of channel 2?
- A.
. 2.444 GHz
- B.
2.417 GHz
- C.
2.424 GHz
- D.
2.422 GHz
Correct Answer
B. 2.417 GHz -
- 18.
What are the modulation types used by OFDM technology? (choose two)
- A.
QAM
- B.
Phase
- C.
. Frequency
- D.
Amplitude
Correct Answer(s)
A. QAM
B. Phase -
- 19.
The Barker Code converts a bit of data into a series of bits that are referred to as what?
- A.
Chipset
- B.
Chips
- C.
Convolutional code
- D.
Complementary code
Correct Answer
B. Chips -
- 20.
OFDM uses how many 312.5 KHz subcarriers for transmitting data?
- A.
54
- B.
52
- C.
48
- D.
36
Correct Answer
C. 48 -
- 21.
An 802.11 wireless network name is which type of address? (choose two)
- A.
BSSID
- B.
MAC address
- C.
IP address
- D.
SSID
- E.
Extended service set identifier
Correct Answer(s)
D. SSID
E. Extended service set identifier -
- 22.
Which two 802.11 topologies require the use of an access point? (choose two)
- A.
WPAN
- B.
. IBSS
- C.
Basic service set
- D.
Ad-hoc
- E.
ESS
Correct Answer(s)
C. Basic service set
E. ESS -
- 23.
The 802.11 standard defines which medium to be used in a distribution system (DS)?
- A.
802.3 Ethernet
- B.
802.15
- C.
. 802.5 token ring
- D.
Star-bus topology
- E.
None of the above
Correct Answer
E. None of the above -
- 24.
Which option is a wireless computer topology used for communication of computer devices within close proximity of a person?
- A.
WLAN
- B.
Bluetooth
- C.
ZigBee
- D.
WPAN
- E.
WMAN
Correct Answer
D. WPAN -
- 25.
Support for roaming is required under the 802.11 standard. Which 802.11 service set may allow for roaming?
- A.
ESS
- B.
Basicservice set
- C.
Co-located APs
- D.
IBSS
- E.
Spread spectrum service set
Correct Answer
A. ESS -
- 26.
What factors might affect the size of a BSA coverage area of an access point?(Choose three)
- A.
Antenna gain
- B.
CSMA/CA
- C.
Transmission power
- D.
Indoor/outdoor surroundings
- E.
Distribution system
Correct Answer(s)
A. Antenna gain
C. Transmission power
D. Indoor/outdoor surroundings -
- 27.
) What is the default configuration mode that allows an AP radio to operate in a basic service set?
- A.
Scanner
- B.
Repeater
- C.
Root
- D.
Access
- E.
Non-root
Correct Answer
C. Root -
- 28.
Which terms describe an 802.11 topology involving STAs but no access points? (choose three)
- A.
BSS
- B.
Ad-hoc
- C.
DSSS
- D.
. . Infrastructure
- E.
. IBSS
- F.
. Peer-to-Peer
Correct Answer(s)
B. Ad-hoc
E. . IBSS
F. . Peer-to-Peer -
- 29.
STAs operating in infrastructure mode may communicate in which of the following scenarios? (choose two)
- A.
802.11 frame exchanges with other STAs via an AP
- B.
802.11 frame exchanges with an AP in scanner mode
- C.
802.11 frame peer-to-peer exchanges directly with other STAs
- D.
Upper-layered frame exchanges with network devices on the DSM
- E.
All of the above
Correct Answer(s)
A. 802.11 frame exchanges with other STAs via an AP
D. Upper-layered frame exchanges with network devices on the DSM -
- 30.
What are the only three topologies defined by the 802.11 standard? (choose three)
- A.
. Bridge mode
- B.
Extended service set
- C.
BSS
- D.
IBSS
- E.
FHSS
Correct Answer(s)
B. Extended service set
C. BSS
D. IBSS -
- 31.
Which wireless topology provides citywide wireless coverage?
- A.
WMAN
- B.
WLAN
- C.
WPAN
- D.
WAN
- E.
WWAN
Correct Answer
A. WMAN -
- 32.
At which layer of the OSI model will a BSSID address be used?
- A.
Physical
- B.
Network
- C.
Session
- D.
Data-Link
- E.
Application
Correct Answer
D. Data-Link -
- 33.
The basic service set identifier address can be found in which topologies? (choose three)
- A.
FHSS
- B.
IBSS
- C.
ESS
- D.
DSSS
- E.
BSS
Correct Answer(s)
B. IBSS
C. ESS
E. BSS -
- 34.
802.11 wireless networking will not scale appropriately to accommodate which wireless topology?
- A.
WLAN
- B.
WPAN
- C.
WMAN
- D.
WWAN
- E.
VLAN
Correct Answer
D. WWAN -
- 35.
Which wired network hardware devices do access points most resemble? (choose two)
- A.
Switch
- B.
Node
- C.
Hub
- D.
Router
- E.
Server
Correct Answer(s)
A. Switch
C. Hub -
- 36.
What are some nonstandard modes in which an AP radio may be configured? (choose three)
- A.
Scanner
- B.
Root
- C.
Bridge
- D.
Non-root
- E.
Repeater
Correct Answer(s)
A. Scanner
C. Bridge
E. Repeater -
- 37.
A network consisting of clients and two or more access points connected by an 802.3 Ethernet backbone is one example of which 802.11 topology? (choose two)
- A.
ESS
- B.
Basic Service set
- C.
Extended service set
- D.
. IBSS
- E.
Ethernet service set
Correct Answer(s)
A. ESS
C. Extended service set -
- 38.
What term best describes two access points communicating with each other wirelessly while also allowing clients to communicate through the access point?
- A.
WDS
- B.
DS
- C.
DSS
- D.
DSSS
- E.
DSM
Correct Answer
A. WDS -
- 39.
What components make up a distribution system? (choose two)
- A.
DSSS
- B.
Distribution system services
- C.
DSM
- D.
DSSI
- E.
Intrusion Detection System
Correct Answer(s)
B. Distribution system services
C. DSM -
- 40.
) What type of wireless topology is defined by the 802.11 standard?
- A.
WAN
- B.
WLAN
- C.
WWAN
- D.
WMAN
- E.
WPAN
- F.
None of the above
Correct Answer
B. WLAN -
- 41.
DCF is also known as what? (choose two)
- A.
Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
- B.
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
- C.
Data Control Function
- D.
Distributed Coordination Function
Correct Answer(s)
B. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
D. Distributed Coordination Function -
- 42.
802.11 collision detection is handled using which technology?
- A.
Network allocation vector (NAV)
- B.
Clear channel assessment (CCA)
- C.
Duration/ID value
- D.
Receiving an ACK from the destination station
- E.
Positive collision detection cannot be determined
Correct Answer
E. Positive collision detection cannot be determined -
- 43.
ACK and CTS frames can follow which interframe space?
- A.
EIFS
- B.
DIFS
- C.
PIFS
- D.
SIFS
- E.
LIFS
Correct Answer
D. SIFS -
- 44.
The Carrier Sense portion of CSMA/CA is performed using which of the following methods? (choose three)
- A.
Virtual carrier-sense
- B.
Physical carrier-sense
- C.
Channel sense window
- D.
Clear channel assessment
Correct Answer(s)
A. Virtual carrier-sense
B. Physical carrier-sense
D. Clear channel assessment -
- 45.
) After the station has performed the carrier sense and determined that no other devices are transmitting for a period of a DIFS interval, the next step is for the station to do what?
- A.
Wait the necessary number of slot times before transmitting.
- B.
Begin transmitting
- C.
Select a random backoff value
- D.
Begin the random backoff timer
Correct Answer
C. Select a random backoff value -
- 46.
) If PCF is implemented, it can function in which of the following network environments? (choose two)
- A.
Ad-Hoc mode
- B.
BSS
- C.
. IBSS
- D.
. Infrastructure mode
- E.
. BSA
Correct Answer(s)
B. BSS
D. . Infrastructure mode -
- 47.
Which of the following terms are affiliated with the virtual carrier-sense mechanism? (choose two)
- A.
Contention window
- B.
Network allocation vector
- C.
Random back-off time
- D.
Duration/ID field
Correct Answer(s)
B. Network allocation vector
D. Duration/ID field -
- 48.
Which of the following statements are about PCF are true? (choose three)
- A.
PCF will work in only a BSS.
- B.
PCF can be used in an IBSS.
- C.
Both the station and access point must support PCF for it to be used.
- D.
The access point will alternate between PCF and DCF mode.
- E.
PCF is a form of contention
Correct Answer(s)
A. PCF will work in only a BSS.
C. Both the station and access point must support PCF for it to be used.
D. The access point will alternate between PCF and DCF mode. -
- 49.
) CSMA/CA and DCF define which mechanisms to ensure that only one 802.11 radio can transmit on the half-duplex RF medium? (Choose four)
- A.
Random back-off timer
- B.
NAV
- C.
CCMP
- D.
CCA
- E.
Interframe spacing
Correct Answer(s)
A. Random back-off timer
B. NAV
D. CCA
E. Interframe spacing -
- 50.
The Wi-Fi Alliance certification called Wi-Fi Multimedia (WMM) is based on which media access method defined by the 802.11-2007 standard?
- A.
DCF
- B.
PCF
- C.
EDCA
- D.
HCCA
- E.
HSRP
Correct Answer
C. EDCA -
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Nov 25, 2013Quiz Edited by
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