Certified Wireless Network Administrator CWNA-109 Exam Dumps Questions

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Full version: CWNA-109 Exam Dumps Questions
1.The IEEE process to create a PoE standard began in?
A. 1999
B. 2002
C. 1998
D. 2000
Answer: A
2.A powered device (PD) must be capable of accepting up to how many volts from either the data
lines or the unused pairs of the Ethernet cable?
A. 14.5 volts
B. 20.5 volts
C. 48 volts
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D. 57 volts
Answer: D
3.Which medium contention and access method is used as the foundation of 802.11 Distributed
Coordination Function (DCF)?
A. Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
B. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
C. Token passing
D. Demand priority
Answer: B
4.What is the recommended received signal and SNR when providing for VoWiFi client
communications?
A. C70 dBm and 20 dB
B. C70 dBm and 25 dB
C. C70 dBm and 15 dB
D. C65 dBm and 15 dB
E. C65 dBm and 25 dB
Answer: E
5.Physical carrier sense uses which two thresholds during the clear channel assessment to determine
if the medium is busy?
A. RF detect
B. Signal detect
C. Transmission detect
D. Energy detect
E. Random detect
Answer: BD
6.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
Answer: B
7.Which of the following are protection mechanisms? (Choose all that apply.)
A. NAV back-off
B. RTS/CTS
C. RTS-to-Self
D. CTS-to-Self
E. WEP encryption
Answer: BD
8.Which 802.11 amendments provide for throughput of 1 Gbps or higher? (Choose all that apply.)
A. 802.11aa
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B. 802.11ab
C. 802.11ac
D. 802.11ad
E. 802.11ae
F. 802.11af
Answer: CD
9.Name the major types of coverage analysis site surveys. (Choose all that apply.)
A. Assisted
B. Self-organizing
C. Manual
D. Capacity
E. Predictive
Answer: CE
10.Many 802.11ac enterprise access points require 802.3at power to be fully functional.
What 802.11ac capabilities might be downgraded when using the lower power provided by 802.3af
power sourcing equipment? (Choose all that apply.)
A. MIMO radio chains
B. 80 MHz channel capability
C. 256-QAM modulation
D. 40 MHz channel capability
Answer: ABC
11.Maximum data rates of_______are permitted using OFDM radios.
A. 108 Mbps
B. 22 Mbps
C. 24 Mbps
D. 54 Mbps
E. 11 Mbps
Answer: D
12.A service set identifier is often synonymous with which of the following?
A. IBSS
B. ESSID
C. BSSID
D. BSS
Answer: B
13.A client complains of low data rates on his computer. When you evaluate the situation, you see
that the signal strength is -84 dBm and the noise floor is -96 dBm. The client is an 802.11ac client and
connects to an 802.11ac AP. Both the client and AP are 2x2:2 devices.
What is the likely cause of the low data rate issue?
A. Weak signal strength
B. CAT5e cabling run to the AP
C. Too few spatial streams
D. Lack of support for 802.11n
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Answer: A
14.You are performing a post-implementation validation survey.
What basic tool can be used to easily locate areas of high co-channel interference?
A. Throughput tester
B. Laptop-based spectrum analyzer
C. Access point spectrum analyzer
D. Wi-Fi scanner
Answer: D
15.The Wi-Fi HaLow certification from the Wi-Fi Alliance will likely be used for sensor networks and
Internet of Things (IoT) devices and is based on which IEEE amendment?
A. 802.11aq
B. 802.11ak
C. 802.11ae
D. 802.11ai
E. 802.11ah
Answer: E
16.While performing some research, Janie comes across a reference to a document titled RFC 3935.
Which of the following organization's website would be best to further research this document?
A. IEEE
B. Wi-Fi Alliance
C. WECA
D. FCC
E. IETF
Answer: E
17.The ___________ is the ambient or background level of radio energy on a specific channel.
A. Received Signal Strength Indicator
B. Noise Floor
C. RF Mathematics
D. SNR
Answer: B
18.What item is essential for performing a manual RF site survey for a warehouse facility?
A. A facility map with an explanation of applications used in each area
B. I-Beam mounting kits for hanging temporary access points
C. Low-gain omni antennas for APs mounted high on warehouse ceilings
D. Predictive site survey software that supports highly directional antennas
E. NEMA enclosures that protect APs used for the survey
Answer: A
19.802.11 technology is typically deployed at which fundamental layer of network architecture?
A. Core
B. Distribution
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C. Access
D. Network
Answer: C
20.An endpoint PSE that provides power by using Alternative B is capable of providing power to
devices by using which of the following Ethernet technologies? (Choose all that apply.)
A. 10BaseT
B. 100BaseTX
C. 1000BaseT
D. 100BaseFX
Answer: ABC
21.Which modulation types are used by OFDM technology? (Choose all that apply.)
A. QAM
B. Phase
C. Frequency
D. Hopping
Answer: AB
22.Which radio form factors can be used by 802.11 technology?
A. USB 3.0
B. Secure Digital
C. PCMCIA
D. Mini PCI
E. ExpressCard
F. Proprietary
G. All of the above
Answer: G
23.Which of the following contains only LLC data and the IP packet but does not include any 802.11
data?
A. MPDU
B. PPDU
C. PSDU
D. MSDU
E. MMPDU
Answer: D
24.Which of these 802.11 technologies can operate in the 2.4 GHz frequency band? (Choose all that
apply.)
A. 802.11a (OFDM radios)
B. 802.11b (HR-DSSS radios)
C. 802.11g (ERP radios)
D. 802.11n (HT radios)
E. 802.11ac (VHT radios)
F. 802.11ax (HE radios)
Answer: BCDF
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25.In an 802.11n WLAN with a heterogeneous set of associated client devices including 802.11b,
11g, and 11n, what HT protection mode will the BSS use?
A. Mode 0: No protection mode (Greenfield)
B. Mode 1: Nonmember protection mode
C. Mode 2: 20 MHz protection mode
D. Mode 3: Non-HT mixed mode
Answer: D
26.What is the primary reason that OFDM (802.11a) radios cannot communicate with ERP (802.11g)
radios?
A. 802.11a uses OFDM, and 802.11g uses DSSS.
B. 802.11a uses DSSS, and 802.11g uses OFDM.
C. 802.11a uses OFDM, and 802.11g uses CCK.
D. 802.11a operates at 5 GHz, and 802.11g operates at 2.4 GHz.
E. 802.11a requires dynamic frequency selection, and 802.11g does not.
Answer: D
27.What word describes the bending of an RF signal as it passes through a medium of a varying
density from that of free space?
A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering
Answer: C
28.Select two solutions that can help mitigate peer-to-peer attacks from other clients associated to the
same 802.11 access point.
A. Personal firewall
B. Client isolation
C. OSPF
D. MAC filter
Answer: AB
29.What are some of the key differences and advantages of OFDMA over MU-MIMO with 802.11ax
radios? (Choose all that apply.)
A. Increased efficiency
B. Increased capacity
C. Best for high-bandwidth applications
D. Best for low-bandwidth applications
E. Best with small packets
F. Best with large packets
Answer: ADE
30.A point source that radiates RF signal equally in all directions is known as what?
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A. Omnidirectional signal generator
B. Omnidirectional antenna
C. Intentional radiator
D. Nondirectional transmitter
E. Isotropicradiator
Answer: E
31.What are some of the key concerns of healthcare providers when installing a wireless network?
(Choose all that apply.)
A. RF interference
B. Faster access to patient data
C. Secure and accurate access
D. Faster speed
Answer: ABC
32.Which 802.11ax technology has the potential to decrease co-channel interference (CCI)? (Choose
all that apply.)
A. Buffer status report
B. Target wake time
C. BSS color
D. Guard interval
E. Long symbol time
F. Spatial reuse operation
Answer: CF
33.What are some possible effects of voltage standing wave ratio (VSWR)? (Choose all that apply.)
A. Increased amplitude
B. Decreased signal strength
C. Transmitter failure
D. Erratic amplitude
E. Out-of-phase signals
Answer: BCD
34.A robust security network (RSN) requires the use of which security mechanisms? (Choose all that
apply.)
A. 802.11x
B. WEP
C. IPsec
D. CCMP/AES
E. CKIP
F. 802.1X
Answer: DF
35.ABC Company has just purchased a 6 dBi patch antenna. After performing some tests with the 6
dBi antenna, they have concluded that more antenna gain is needed to cover their outdoor courtyard.
When choosing an antenna with higher gain, what other antenna characteristic will also always
change?
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A. Fresnel Zone size
B. Maximum input power
C. Beamwidth
D. Impedance
E. VSWR Ratio
Answer: C
36.What are some potential problems when enabling 40 MHz channels in the 5 GHz band? (Choose
all that apply.)
A. Adjacent channel interference
B. Co-channel interference
C. Higher SNR
D. Lower SNR
E. Decreased range
Answer: BD
37.At maximum power for a PD, the PSE must be capable of providing _______ or _______ of power
to each PoE device, depending on whether your devices require PoE+.
A. 15w and 29.9w
B. 15.4w and 30w
C. 15.3w and 31w
D. 15.5w and 30w
Answer: B
38.Name potential sources of interference in the 5 GHz U-NII band. (Choose all that apply.)
A. Perimeter sensors
B. Nearby OFDM (802.11a) WLAN
C. FM radio
D. DSSS access point
E. Bluetooth
F. Nearby HT (802.11n) WLAN
Answer: ABF
39.The hidden node problem occurs when one client station's transmissions are not heard by some of
the other client stations in the coverage area of a basic service set (BSS).
What are some of the consequences of the hidden node problem? (Choose all that apply.)
A. Retransmissions
B. Intersymbol interference (ISI)
C. Collisions
D. Increased throughput
E. Decreased throughput
Answer: ACE
40.Which data rate is supported by 802.11g radios that is not supported by 802.11a radios?
A. 9 Mbps
B. 11 Mbps
C. 12 Mbps
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D. 54 Mbps
E. 65 Mbps
F. 130 Mbps
Answer: B
41.You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to
2.4 GHz APs, but is does not even see 5 GHz APs. While evaluating the issue, you determine that
this problem is happening for all of the laptops of this model in the organization.
Several other tablets connect on channel 48 and channel 52 in the same work areas.
What is the likely problem?
A. The clients are configured to use WPA and 5 GHz channels only support WPA2.
B. The client drivers are faulty and should be upgraded.
C. The antennas in the laptop have insufficient gain to detect the 5 GHz signals.
D. The access points are configured to disallow 5 GHz.
Answer: C
42.Which of these terms can best be used to compare the relationship between two radio waves that
share the same frequency?
A. Multipath
B. Multiplexing
C. Phase
D. Spread spectrum
Answer: C
43.Savannah has to perform a site survey for a WLAN by using a multiple-channel architecture (MCA)
system in a 20-story building with multiple tenants.
What should Savannah consider during the planning and implementation stages of the site survey?
(Choose all that apply.)
A. Other tenants' WLANs should be considered.
B. Only WLAN controller solutions with lightweight APs should be deployed and not autonomous
access points.
C. Access points should use high-gain omnidirectional antennas to provide coverage across multiple
floors.
D. Access points should be at full transmit power to provide coverage across multiple floors.
E. The cell coverage of each access point should extend to only one floor above and one floor below
to create a three-dimensional channel reuse pattern.
Answer: AE
44.What statement about the IEEE 802.11e QoS facility is true?
A. 802.11 QoS is achieved by giving high priority queues a statistical advantage at winning
contention.
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. To improve efficiency, Block Acknowledgments are required for Voice and Video WMM queues.
E. 802.11 control frames are assigned to the 802.11 EF priority queue.
Answer: A
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45.What is the most effective method for testing roaming in relation to 802.11 VoIP handsets?
A. Use a spectrum analyzer to monitor RF activity during a VoIP call.
B. Use a protocol analyzer to capture the traffic generated when a laptop roams.
C. Place a call with the handset and move around the facility to test quality during roaming.
D. Use the built-in roaming monitor built into all VoIP handsets.
Answer: C
46.Which sublayer of the OSI model's Data-Link layer is used for communication between 802.11
radios?
A. LLC
B. WPA
C. MAC
D. FSK
Answer: C
47.An 802.11a radio card can transmit on the_______frequency and uses_______spread spectrum
technology.
A. 5 MHz, OFDM
B. 2.4 GHz, HR-DSSS
C. 2.4 GHz, ERP-OFDM
D. 5 GHz, OFDM
E. 5 GHz, DSSS
Answer: D
48.Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility of
both OFDM and HR/DSSS? (Choose 2)
A. HR/DSSS (802.11b)
B. OFDM (802.11a)
C. ERP (802.11g)
D. HT (802.11n)
E. CCK (802.11b)
F. VHT (802.11ac)
Answer: CD
49.You have been sent as a consultant to a customer site that is experiencing problems with some
2.4 GHz clients on their 802.11a/g/n/ac network.
After collecting information from the company about the problem, your initial troubleshooting step is to
find a client device experiencing performance problems and observe its 802.11 frame exchanges in a
protocol analyzer. The retransmission rate for that client is 65% instead of the company’s baseline,
which is 9%.
Based on this information, what troubleshooting step should follow to isolate the problem?
A. Check the frame decodes in the protocol analyzer and look for an excessive number of
deauthentication frames.
B. Evaluate the client’s operating frequency band with a spectrum analyzer, looking for a high noise
floor or interference sources.
C. Utilize a laptop-based site survey and planning tool to create a predictive model of the optimal AP
placement in the customer’s facility.
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D. With a protocol analyzer, identify the client’s roaming threshold settings and reassociation
behavior.
E. Install Wi-Fi endpoint security and reporting software on the client device to monitor and log the
retransmission behavior.
Answer: B
50.The goal of allocating equal time as opposed to equal opportunity is known as what?
A. Access fairness
B. Opportunistic media access
C. CSMA/CA
D. Airtime fairness
Answer: D
51.Which of the following is least likely to be offered by a hotspot provider?
A. Free access
B. Paid access
C. Network authentication
D. Data encryption
Answer: D
52.The corporate IT administrators, Hunter, Rion, and Liam, are huddled together to try to solve an
issue with the newly deployed VoWiFi phones. The chosen security solution is PEAPv0 (EAP-
MSCHAPv2) for the voice SSID that also has Voice-Enterprise enabled on the access points.
The VoWiFi phones are authenticating flawlessly and voice calls are stable when the employees use
the devices from their desks. However, there seem to be gaps in the audio and sometimes
disconnects when the employeesare talking on the VoWiFi phones and move to other areas of the
building.
What are the possible causes of the interruption of service for the voice calls while the employees are
mobile? (Choose all that apply.)
A. VoWiFi phones should be configured only for PSK authentication when roaming is a requirement.
B. VoWiFi phones are reauthenticating every time they roam to a new AP.
C. VoWiFi phones do not use opportunistic key caching.
D. VoWiFi phones do not support fast BSS transition.
Answer: BD
53.What kind of remote actions can an MDM administrator send to the mobile device over the
Internet?
A. Configuration changes
B. Restriction changes
C. Locking the device
D. Wiping the device
E. Application changes
F. All of the above
Answer: F
54.George is designing an 802.3at-capable network and is installing a 24-port Ethernet switch to
support 10 Class 2 cameras and 10 Class 3 APs. The switch requires 1,000 watts to perform its basic
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switching functions.
How much total power will be needed?
A. 1,080 watts
B. 1,224 watts
C. 1,308 watts
D. 1,500 watts
Answer: B
55.In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from
performing a fast and seamless transition (i.e. latency-sensitive applications are not disrupted)
between two access points that are managed by the same WLAN controller?
A. The current AP is using channel 1 and the new AP is using channel 40.
B. The SSID of the current AP does not match the SSID of the new AP.
C. The current AP supports only HT and the new AP is VHT capable.
D. The access points are hiding the SSID in Beacons and Probe Response frames.
Answer: B
56.802.11 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.
Answer: E
57.Users and Network support personnel at a mid-sized equipment manufacturer have been
discussing the potential uses and benefits of implementing an indoor WLAN.
The network administrator and network manager have requested a meeting of senior management
personnel to discuss a WLAN implementation before performing a site survey or taking any
implementation steps. The first topic of discussion in the meeting is the corporate policy concerning
implementation and use of WLAN technology.
What specific topics are appropriate in this policy meeting? (Choose 2)
A. Use of the latest 802.11ac equipment
B. Business justification
C. User productivity impact
D. Antenna types
E. Defining RF channels for use
Answer: BC
58.The FCC is preparing for the advent of 802.11ac technology that can use 80 MHz and 160 MHz
channels, and therefore, more unlicensed spectrum is needed.
What are the newly proposed 5 GHz frequency bands? (Choose all that apply.)
A. U-NII-1
B. U-NII-2A
C. U-NII-2B
D. U-NII-2C
E. U-NII-3
F. U-NII-4
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Answer: CF
59._______ and _______ are two forms of contention that are heavily used in today’s networks.
(Choose two)
A. Carrier Sense Multiple Access with Collision Detection (CSMA \ CD)
B. Carrier Sense Minimal Access with Collision Acceptance (CSMA \ CA)
C. Carrier Sense Minimal Access with Collision Division (CSMA \ CD)
D. Carrier Sense Multiple Access with Collision Avoidance (CSMA \ CA)
Answer: AD
60.What are some operational modes in which an AP radio may be configured? (Choose all that
apply.)
A. Scanner
B. Root
C. Bridge
D. Mesh
E. Repeater
Answer: ABCDE
61.The IEEE 802.11-2012 standard requires VHT capable devices to be backward compatible with
devices using which other 802.11 physical layer specifications (PHYs)? (Choose 2)
A. HT
B. OFDM
C. HR/DSSS
D. ERP-PBCC
E. DSSS-OFDM
Answer: AB
62.Which wireless topology provides citywide wireless coverage?
A. WMAN
B. WLAN
C. WPAN
D. WAN
E. WWAN
Answer: A
63.Which IEEE 802.11 amendment specifies the use of up to eight spatial streams of modulated data
bits?
A. IEEE 802.11n
B. IEEE 802.11g
C. IEEE 802.11ac
D. IEEE 802.11s
E. IEEE 802.11w
Answer: C
64.During a post-implementation survey, you have detected a non-802.11 wireless device
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transmitting in the area used by handheld 802.11g scanners.
What is the most important factor in determining the impact of this non-802.11 device?
A. Receive sensitivity
B. Channel occupied
C. Airtime utilization
D. Protocols utilized
Answer: C
65.What 802.11n mode of operation sends the same data on two adjacent 20 MHz channels?
A. Greenfield mode
B. HT Mixed mode
C. Non-HT duplicate mode
D. LDPC mode
Answer: C
66.What components make up a distribution system? (Choose all that apply.)
A. HR-DSSS
B. Distribution system services
C. DSM
D. DSSS
E. Intrusion detection system
Answer: BC
67.Which amendment defines performance enhancements using the much higher unlicensed
frequency band of 60 GHz, and a transmission method known as directional multi-gigabit (DMG)?
A. 802.11ac
B. 802.11ad
C. 802.11ay
D. 802.11q
E. 802.11z
Answer: B
68.Braydon, a WLAN consultant, has recommended that a new 802.11n/ac network use only 40 MHz
channels in the 5 GHz U-NII bands.
Why would he recommend that 40 MHz channels be used only in 5 GHz and not in 2.4 GHz?
A. HT/VHT radios do not require DFS and TPC in the 5 GHz bands.
B. HT/VHT radios get better range using TxBF in the 5 GHz bands.
C. 40 MHz channels do not scale in the 2.4 GHz ISM band.
D. 5 GHz VHT radios are less expensive than 2.4 GHz HT radios.
Answer: C
69.Which one of the following is not a factor considered when calculating the Link Budget for an
outdoor point-to-point WLAN bridge link?
A. Operating frequency
B. MU-MIMO capabilities of the bridges
C. Receive antenna gain
D. Transmit power
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Answer: B
70.What are some of the necessary components of a VoWiFi architecture? (Choose all that apply.)
A. VoWiFi phone
B. SIP
C. WMM support
D. Proxy server
E. PBX
Answer: ACE
71.802. 11ax (HE) introduces Resource Units that can be used to allow communications with multiple
devices at the same time, on the same channel, in the same BSS.
What feature of 802.1 lax provides this functionality?
A. 6 GHz support
B. TWT
C. Wi-Fi-LTE
D. OFDMA
Answer: D
72.What is the maximum number of resource units that can be used for a 20 MHz OFDMA channel?
A. 2
B. 4
C. 9
D. 26
E. 52
Answer: C
73.Layer 2 retransmissions occur when frames become corrupted.
What are some of the causes of layer 2 retries? (Choose all that apply.)
A. High SNR
B. Low SNR
C. Co-channel interference
D. RF interference
E. Adjacent channel interference
Answer: BDE
74.When an RF signal bends around an object, this propagation behavior is known as what?
A. Stratification
B. Refraction
C. Scattering
D. Diffraction
E. Attenuation
Answer: D
75.Which type of interference is caused by destructive multipath?
A. Intersymbol interference
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B. All-band interference
C. Narrowband interference
D. Wideband interference
E. Physical interference
Answer: A
76.As defined in the 802.11 specification, legacy Power Save requires an inefficient back-and-forth
frame exchange process. Due to this inefficiency, many WLAN device implementations use a
variation of 802.11 Power Save to accomplish the same function.
What non-standard power save behavior is used by most Wi-Fi devices in actual legacy Power Save
implementations?
A. Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon.
B. After each beacon, the AP attempts to empty its frame buffer by sending Wake-on-WLAN frames
to wake each dozing client.
C. Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered
data.
D. The Beacon interval is changed from the default 100 time units to 10 or less time units.
E. Clients send null dataframes to the AP and switch the power management bit from 1 to 0 to
receive queued data.
F. Stations send a CTS-to-self frame to the AP with a very long duration period so they can receive all
of their buffered data at once.
Answer: E
77.WLAN vendors use RSSI thresholds to trigger which radio card behaviors? (Choose all that apply.)
A. Receive sensitivity
B. Roaming
C. Retransmissions
D. Dynamic rate switching
Answer: BD
78.Given that an 802.11 MAC header can have as many as four MAC addresses, which type of
addresses are not found in an 802.3 MAC header? (Choose all that apply.)
A. SA
B. BSSID
C. DA
D. RA
E. TA
Answer: BDE
79.Which of these 802.11 data frames carry an MSDU payload? (Choose all that apply.)
A. Non-QoS data frame
B. QoS data frame
C. Null frame
D. QoS null frame
Answer: AB
80.2 dBd is equal to how many dBi?
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A. 5 dBi
B. 4.41 dBi
C. 4.14 dBi
D. The value cannot be calculated.
Answer: C
81.Which of these propagation behaviors can result in multipath? (Choose all that apply.)
A. Refraction
B. Diffraction
C. Reflection
D. Scattering
E. None of the above
Answer: ABCD
82.Which of these client radios will be able to transmit in the U-NII-5 band?
A. Wi-Fi 4 client radios
B. Wi-Fi 5 client radios
C. Wi-Fi 6 client radios
D. Wi-Fi 6E client radios
E. Wi-Fi 7 client radios
Answer: D
83.Transmit beamforming uses what type of frames to analyze the MIMO channel before transmitting
directed paths of data?
A. Trigger frames
B. Beaming frames
C. Sounding frames
D. SM power save action frames
Answer: C
84.What must occur to generate dynamic TKIP/RC4 or CCMP/AES encryption keys? (Choose all that
apply.)
A. Shared Key authentication and 4-Way Handshake
B. 802.1X/EAP authentication and 4-Way Handshake
C. Static WEP and 4-Way Handshake
D. PSK authentication and 4-Way Handshake
Answer: BD
85.Which potential regional weather conditions can adversely affect an outdoor wireless bridge link
and should be noted during an outdoor site survey? (Choose all that apply.)
A. Lightning
B. Dew point
C. Wind
D. Cloud cover
E. Thunder
Answer: AC
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86.What standard is referenced in the 802.11-2016 specification and is recommended for robust
WLAN client security?
A. SSID hiding
B. WEP
C. 802.1X/EAP
D. IPSec VPN
Answer: C
87.What is the number one cause of layer 2 retransmissions?
A. Low SNR
B. Hidden node
C. Adjacent cell interference
D. RF interference
Answer: D
88.Warehousing and manufacturing environments typically have which of the following requirements?
(Choose all that apply.)
A. Mobility
B. High-speed access
C. High capacity
D. High coverage
Answer: AD
89.In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when
other client stations are actively communicating in the same BSS?
A. 802.11 DOS prevention
B. OFDMA
C. CSMA/CD
D. CSMA/CA
Answer: D
90.802.11 wireless bridge links are typically associated with which network architecture layer?
A. Core
B. Distribution
C. Access
D. Network
Answer: B
91.What can cause PSK authentication to fail? (Choose all that apply.)
A. Passphrase mismatch
B. Expired root CA certificate
C. WLAN client driver problem
D. Expired LDAP user account
E. Encryption mismatch
Answer: ACE
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92.How many client devices can successfully connect to and communicate with an AP?
A. 35
B. 50
C. 100
D. 250
E. It depends.
Answer: E
93.Which of the following 802.11 frames carry an MSDU payload that may eventually be transferred
by the integration service into an 802.3 Ethernet frame?
A. 802.11 management frames
B. 802.11 control frames
C. 802.11 data frames
D. 802.11 action frames
E. 802.11 association frames
Answer: C
94.Which of these attacks will not be detected by a wireless intrusion detection system (WIDS)?
A. Deauthentication spoofing
B. MAC spoofing
C. Rogue access point
D. Eavesdropping with a protocol analyzer
E. Association flood
Answer: D
95.What term correctly completes the following sentence? In an IEEE 802.11 frame, the IP packet is
considered by the MAC layer to be a(n) _________.
A. MAC Service Data Unit (MSDU)
B. MAC Protocol Data Unit (MPDU)
C. IP datagram
D. PLCP Service Data Unit (PSDU)
E. PLCP Protocol Data Unit (PPDU)
Answer: A
96.Which unit of measurement is an absolute unit that is used to quantify power levels on a linear
scale?
A. dBm
B. W
C. dB
D. mW
E. VSWR
Answer: A
97.Which option is a wireless computer topology used for communication of computer devices within
close proximity of a person?
A. WWAN
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B. Bluetooth
C. ZigBee
D. WPAN
E. WMAN
Answer: D
98.In addition to throughput enhancements, what other improvements does a dual-band 802.11ac AP
provide when compared with 802.11a/g APs? (Choose 2)
A. Introduces “fast transition” roaming protocols for VoWiFi phones
B. Better link reliability between 802.11a/b/g client devices and 802.11ac APs
C. Improves service quality for real-time applications at greater distances
D. Increases in receive sensitivity enhance RTLS location accuracy
E. Stronger security with more robust encryption modes.
Answer: BC
99.Which of the following are true about cables? (Choose all that apply.)
A. They cause impedance on the signal.
B. They work regardless of the frequency.
C. Attenuation decreases as frequency increases.
D. They add loss to the signal.
Answer: AD
100.When is an ERP (802.11g) AP required by the IEEE 802.11-2012 standard to respond to probe
request frames from nearby HR-DSSS (802.11b) stations? (Choose all that apply.)
A. When the probe request frames contain a null SSID value
B. When the AP supports only ERP-OFDM data rates
C. When the AP supports only HR/DSSS data rates
D. When the Power Management bit is set to 1
E. When the probe request frames contain the correct SSID value
Answer: AE
101.__________ antennas are designed to direct a signal in a specific direction.
A. Patch
B. Omnidirectional
C. Semidirectional
D. Planar
Answer: C
102.An ERP (802.11g) network mandates support for which two spread spectrum technologies?
A. ERP-OFDM
B. FHSS
C. ERP-PBCC
D. ERP-DSSS/CCK
E. CSMA/CA
Answer: AD
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103.In a guest firewall policy, which IP networks should be restricted? (Choose all that apply.)
A. 172.16.0.0/12
B. 20.0.0.0/8
C. 192.16.0.0/16
D. 172.10.0.0/24
E. 10.0.0.0/8
Answer: AE
104.Most early deployments of 802.11 FHSS were used in which type of environment?
A. Mobile office networking
B. Educational/classroom use
C. Industrial (warehousing and manufacturing)
D. Healthcare (hospitals and offices)
Answer: C
105.Which of the following wireless communications parameters and usage are typically governed by
a local regulatory authority? (Choose all that apply.)
A. Frequency
B. Bandwidth
C. Maximum transmit power
D. Maximum EIRP
E. Indoor/outdoor usage
Answer: ABCDE
106.When transmitting a QoS frame using MU-MIMO, which of the following statements is true?
(Choose all that apply.)
A. Voice frames are always transmitted before lower-priority frames.
B. The category that is used to take control of the transmission is known as the primary access
category.
C. If a lower category frame is transmitted, only higher category frames can be transmitted using the
other spatial streams.
D. Lower category frames can be transmitted as long as they do not increase the transmission
duration of the primary access category.
E. Multiple lower category frames can be transmitted along with the primary access category frame.
Answer: BDE
107.To reduce airtime consumption and provide for better capacity in the 5 GHz band, which data
rates are recommended to be selected as basic rates? (Choose all that apply.)
A. 6 Mbps
B. 9 Mbps
C. 12 Mbps
D. 18 Mbps
E. 24 Mbps
Answer: CE
108.How does transmit beamforming (TxBF) use multiple MIMO antennas to increase range?
A. Beamsteering21 / 23
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B. Phase shifting
C. Dynamic beamforming
D. Spatial multiplexing
Answer: B
109.What PHY layer mechanisms might be used to increase the range for an 802.11n radio using a
MIMO system? (Choose all that apply.)
A. Maximum ratio combining
B. Guard interval
C. Transmit beamforming
D. Spatial multiplexing
Answer: AC
110.Which 802.11ac MCS range defines all of the MCSs that are mandatory?
A. MCS 0C2
B. MCS 0C4
C. MCS 0C6
D. MCS 0C7
E. MCS 0C8
F. MCS 0C9
Answer: D
111.Which protocols are used to transport 802.11 frames between a controller-based AP and a
WLAN controller? (Choose all that apply.)
A. GRE
B. CCMP
C. Mobile IP
D. CAPWAP
E. Proprietary IP tunneling protocols
F. All of the above
Answer: ADE
112.What features were introduced in the IEEE 802.11h amendment in order to uphold regulatory
requirements for 5 GHz operation? (Choose 2)
A. 256-QAM
B. Distributed Coordination Function (DCF)
C. Phase Shift Keying (PSK)
D. Transmit Power Control (TPC)
E. Radio Resource Management (RRM)
F. Dynamic Frequency Selection (DFS)
Answer: DF
113.What type of solution can be used to perform countermeasures against a rogue access point?
A. WIDS
B. 802.1X/EAP
C. WIPS
D. TKIP/RC4
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E. WINS
Answer: C
114.What two technologies are used to prevent 802.11 radios from interfering with radar and satellite
transmissions at 5 GHz?
A. Dynamic frequency selection
B. Enhanced Distributed Channel Access
C. Direct sequence spread spectrum
D. Temporal Key Integrity Protocol
E. Transmit power control
Answer: AE
115.Which of these measurements are taken during a passive manual site survey? (Choose all that
apply.)
A. SNR
B. dBi
C. dBm signal strength
D. dBd
Answer: AC
116.The 802.11h amendment (now part of the 802.11-2012 standard) introduced what two major
changes for 5 GHz radios?
A. U-NII-2 Extended
B. IAPP
C. Radar detection
D. Transmit Frequency Avoidance
E. Frequency hopping spread spectrum
Answer: AC
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