Deck 1: Certified Wireless Network Administrator (CWNA)

Question 1

You must provide the best coverage possible for users inside an office. The office is free from tall obstructions such as shelving, but has a high ceiling. You have decided to use a low-gain Omni-directional antenna to achieve your goal. Where should you install the antenna for best coverage?

A)In the center of the building on the roof.
B)In the center of the building on the ceiling.
C)In one of the corners of the building.
D)On one of the walls of the building.

Answer 1

In the center of the building on the ceiling.

Question 2

Which of the following security options are included in most wireless residential gateways?

A)PPPoE
B)Routing
C)VPN Client
D)NAT

Answer 2

VPN Client

Question 3

You are a consultant installing a wireless LAN that will connect two buildings that are 1.5 miles apart, with data transfer speeds of 11 Mbps. Which of the following antennas should you use?

A)Omni-directional
B)High-gain Dipole
C)High-gain Yagi
D)Parabolic dish

Answer 3

High-gain Yagi

Question 4

Why is it not advisable to have a number of access points in the repeater mode in a series?

A)Throughput would not be reduced to unacceptable levels.
B)The access points would all be required to be physically connected to the network.
C)Users attached to the access point in repeater mode will experience high latencies.
D)Legacy serial devices would not be able to communicate with the root access point.

Question 5

You need to connect two wired networks together that currently share no network connectivity between them. Which mode would the access points need to be placed in if the networks use only access points to connect the networks?

A)Root mode
B)Repeater mode
C)Gateway mode
D)Bridging mode

Question 6

John is a consultant installing a wireless LAN that will connect four buildings that are 100 meters apart. Which of the following antennas should he use?

A)4 patch antennas
B)2 parabolic dish antennas and 2 Yagi antennas
C)1 dipole and 3 patch antennas
D)4 panel antennas

Question 7

You are performing an outdoor installation of an Omni-directional antenna. Which of the following will you need to do to ensure a proper installation?

A)Install a lightning arrestor to protect against transient currents.
B)Check if any electrical sources are present close to the area of installation.
C)Check that visual LOS exists with the other antennas in the installation.
D)Avoid touching the cable connections in the series to prevent mis-configuration.

Question 8

Which of the following is not a hardware or software option on a wireless bridge?

A)Fixed antennas
B)Full-duplex radio links
C)Advanced filtering capabilities
D)Removable radio cards

Question 9

Which of the following statements is true about PoE devices from different manufacturers?

A)They always use the same unused pairs for sending current.
B)They are guaranteed to interoperate with devices from other vendors.
C)They use the same output voltage.
D)They may cause damage to devices from other vendors.

Question 10

A wireless LAN installation has a 50-meter cable running between access point and a highly-directional antenna. The output signal sent and received is very weak at each end of the link. Which of the following devices should you add to the configuration to fix the problem?

A)Uni-directional amplifier
B)Uni-directional attenuator
C)Bi-directional amplifier
D)Bi-directional attenuator

Question 11

You are a consultant installing a wireless LAN that will connect two buildings that are 16.7 km apart. You are facing some issues with gusty winds. Which of the following antennas should you use to fix this problem?

A)High-gain Dipole
B)High-gain Yagi
C)High-gain Grid
D)Parabolic dish

Question 12

You need to allow outdoor users to connect to your network via a wireless LAN. Which of the following features would allow you to use an indoor access point with an outdoor antenna?

A)Antenna diversity
B)Detachable antennas
C)Plug and play support
D)Modular radio cards

Question 13

When a station sends an RTS, the Duration/ID field notifies the other stations that they must set their NAV. Which of the following values should the stations set their NAV to?

A)250 microseconds
B)The time necessary to transmit the Data and ACK frames
C)The time necessary to transmit the CTS frame
D)The time necessary to transmit the CTS, Data, and ACK frames

Question 14

Which of the following medium access methods supports QoS requirements under the 802.11e amendment?

A)Enhanced Distributed Coordination Function
B)Singular Coordination Function
C)Point Coordination Function
D)Hybrid Coordination Function Controlled Access

Question 15

You are installing a wireless LAN in an office where the laptop computers have no USB support. Which of the following client devices should be used as a stand-alone client connection to the wireless LAN?

A)ISA adapter
B)PCI adapter
C)PCMCIA card
D)Ethernet converter

Question 16

Jack has purchased a semi-directional antenna and an access point from different vendors. They have been certified as a system by the FCC through a third party. What type of cables or connectors must be used as part of this system to connect the access point to the antenna?

A)RF cable with industry standard connectors and a pigtail cable with appropriate connectors
B)RF cable with N connectors and a pigtail with N connectors on both sides
C)RF cable with SMA connectors and a pigtail with N connectors on both sides
D)RF cable with connectors matching the access point and a pigtail cable with appropriate connectors for the antenna and RF cable connection

Question 17

You are to provide low-cost wireless Internet access for an office with 5 sales agents. Which of the following devices should you use?

A)Access point
B)Wireless Workgroup Bridge
C)Enterprise wireless gateway
D)Wireless residential gateway

Question 18

You are to recommend wireless LAN equipment that allows a corporate user to place limits on the bandwidth used by each of their wireless users. Which of the following devices would you recommend?

A)Access point
B)Enterprise wireless gateway
C)Wireless residential gateway
D)Wireless Workgroup Bridge

Question 19

You are concerned about hackers intruding your wireless network. Which of the following settings should you modify on the access point to address this?

A)WEP configuration
B)Detachable antennas
C)Radio card position
D)Input power

Question 20

You are to increase the capacity of an existing wireless LAN that works on FHSS technology. You want FHSS to be replaced with the DSSS technology to achieve the objective. Which of the following statements could justify your judgment?

A)FHSS devices will cost less and have greater throughput.
B)DSSS devices will cost more, but have greater throughput.
C)New FHSS devices placed in the system may not be compatible with the older devices.
D)DSSS is more secure than FHSS.

Question 21

Why are DSSS channels more susceptible to narrowband interference than FHSS channels?

A)A DSSS channel is much larger and wider.
B)FHSS systems only use one frequency at a time, so the narrowband interference must be on the same exact frequency at the same time.
C)Information is transmitted one frequency at a time instead of simultaneously transmitting over the entire band.
D)FHSS systems simply avoid the frequency on which narrowband interference occurs.

Question 22

Which of the following aspects is not described by the IEEE and OpenAir standards regarding FHSS systems?

A)Allowable levels of interference
B)Frequency bands that may be used
C)Hop sequences
D)Dwell times

Question 23

Which of the following is true regarding some FHSS systems that operate at 2.4 GHz and a speed of 3 Mbps?

A)IEEE 802.11 compliancy
B)Non-interoperable with other FHSS systems
C)OpenAir compliancy
D)Backward compatibility with 900 MHz systems

Question 24

Which of the following can you use to increase the throughput in an FHSS system?

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

Question 25

Which of the following best defines a noise floor?

A)The noise generated as a result of foot traffic
B)The level of RF noise in the wireless LAN environment
C)A fixed level of noise of -100 dBm in a wireless LAN
D)The level of noise at which a wireless LAN starts working

Question 26

You plan to use a Basic or Extended service set. Which of the power management features populate the traffic indication map, or TIM, with station information?

A)Power-save polling mode
B)Continuous aware mode
C)Continuous power mode
D)Power-aware polling mode

Question 27

Which of the following statements is true regarding power management features?

A)Using the Power Save Polling mode allows a wireless client to sleep
B)Using the Power Save Polling mode forces a wireless client to accept an access point's polling
C)Using the Power Save Polling mode allows a wireless client to accept packets while asleep
D)Using the Power Save Polling mode does not cause overhead in an ad hoc network

Question 28

Which of the following statements is true if a station does not receive an ACK after it transmits a data frame and waits a SIFS?

A)The receiving station will not receive the data.
B)The transmitting station may not have sent the data.
C)The transmitting station will wait an additional SIFS to receive the ACK.
D)The transmitting station will send a retransmit notification.

Question 29

Which of the following is a function of the beacon frame?

A)Load balancing all clients across multiple access points
B)Broadcasting the SSID to enable clients to connect to the access point
C)Asynchronizing the time between the access point and clients
D)Allowing client authentication with the access point when using Shared Key authentication

Question 30

Which of the following results when the Power Save Polling mode is used?

A)Increased throughput on the network due to less overhead traffic
B)Intermittent throughput on the network due to more overhead traffic
C)Network traffic is not affected by using PSP.
D)Longer battery life on the clients that use PSP

Question 31

Which of the following does a client station do to indicate that it is using power save mode?

A)It transmits a frame to the access point, with the Sleep field set to 1.
B)It transmits a frame to the access point, with the Power Management field set to 1.
C)The access point determines when the client station uses power save mode using DTIM.
D)It does nothing. Power Save mode is set by default.

Question 32

Which of the following statements is true when transmitting fragmented frames in an environment where frame retransmission is common?

A)The overall number of bits transmitted will always be greater than if fragmentation was disabled.
B)The overall number of bits transmitted will always be less than if fragmentation was disabled.
C)Data throughput may decrease.
D)Data throughput will remain constant.

Question 33

Which of the following specifies why passive scanning is used in a wireless LAN?

A)To allow clients to authenticate with an access point
B)To reduce the time taken by clients to locate and associate to access points when they are roaming
C)To allow clients to actively search for any access points within range
D)To determine which bridge the client will connect to

Question 34

Which of the following will cause the station to stay awake and wait to receive data if a BSS station is in Power Save mode?

A)An ATIM sent to the station
B)A broadcast that does not contains a DTIM
C)Sending a frame with the More Data field set to 1
D)A TIM that contains the stations AID

Question 35

Which of the following best defines the term Hopping used in Frequency Hopping wireless LAN systems?

A)Switching throughput speeds between 11 Mbps to 5.5 Mbps
B)FHSS feature where the carrier frequency is changed
C)Change that occurs as a result of the RF signal getting weaker
D)Change in transmission technology from FHSS to DSSS

Question 36

Which of the following statements is true if an RF signal is considered as a spread spectrum?

A)The system sending the signal uses infrared technology.
B)The power required to send information is significantly greater.
C)The bandwidth used is much wider than that required to send information.
D)The bandwidth used is much less than that used to send information.

Question 37

An 802.11g network has the protected mode enabled. Which of the following provides the best throughput with the least likelihood of retransmissions?

A)AP using RTS/CTS and stations using RTS/CTS
B)AP using RTS/CTS and stations using CTS-to-Self
C)AP using CTS-to-Self and stations using RTS/CTS
D)AP using CTS-to-Self and stations using CTS-to-Self

Question 38

Which of the following specifies why Shared Key authentication is considered a security risk?

A)Access points transmit unencrypted challenge text and receive the same challenge text encrypted with the WEP key
B)Keys are shared broadcasted to all network nodes
C)A hacker can sniff the keys with a protocol analyzer
D)All computers use identical WEP keys

Question 39

When should you configure the Continuous Aware Mode on wireless LAN clients?

A)When portable laptop station users need the ability to roam away from power sources
B)When desktop stations are not frequently moved from their permanent location
C)When PDAs have limited battery life
D)When laptop computers do not remain connected to a power source

Question 40

Which of the following is a disadvantage associated with using a number of access points in the Repeater Mode in a series?

A)Throughput will be reduced to unacceptable levels
B)All access points should be physically connected to the network.
C)Users attached to the repeater access point will experience high latencies.
D)Legacy serial devices will not be able to communicate with the root access point.

Question 41

Which of the following is an advantage of the 5 GHz, 802.11a equipment over a 2.4 GHz, 802.11b equipment?

A)5 GHz UNII band is wider than the 2.4 GHz ISM band.
B)802.11a equipment is less expensive than 802.11b.
C)802.11a equipment is backwards compatible with 802.11g equipment.
D)5 GHz UNII bands allows for more non-overlapping channels than the 2.4 GHz ISM band.

Question 42

Which of the following must be used to provide continuous connectivity when a client station is roaming across layer 3 boundaries?

A)Nomadic roaming solution
B)Seamless roaming solution
C)Fast secure roaming solution
D)Proprietary layer 3 roaming solution

Question 43

Which of the following methods should be used to set the threshold when using RTS/CTS in "On with Threshold" mode on a wireless LAN?

A)Automatically, by the access points only
B)Manually, by the user of the hidden node
C)Manually, on the clients and access points
D)Automatically, by the clients only

Question 44

A client on the Wireless network who is farther away from the access point and using less power is masked by a client who is closer to the access point and using high power. What is this condition called?

A)Hidden Node condition
B)Near/Far condition
C)Degraded throughput condition
D)Interference condition

Question 45

Which of the following specifies why you are able to co-locate 3 DSSS access points in the same area using the 2.4 GHz ISM band?

A)Each access point will use channels that do not overlap or cause adjacent channel interference.
B)Each access point will transmit on one band and receive on another.
C)Each access point will use co-channel interference to stop the others from transmitting data when it is ready to send data.
D)There are up to five non-overlapping DSSS channels in the ISM bands.

Question 46

In a network setup a set of access points are connected to the wired segment. Your key objective is to extend the range of the access points to clients who are outside the range of the access points in the wired segment. So you connected interconnect the access points in the some other access points wirelessly.. Which mode will the access point not connected to the wired LAN segment use?

A)Root
B)Repeater
C)Bridge
D)Router

Question 47

Which of the following specifies the function of a wireless bridge?

A)Connects mobile users to the wired LAN
B)Provides Hub connectivity
C)Provides Wireless security
D)Used for point-to-multipoint configurations

Question 48

Which of the following wireless client devices is not a plug-n-play device?

A)USB Client
B)ISA Card
C)PCMCIA Card
D)Compact Flash Card

Question 49

You discover that some coaxial cables connected to the company's outdoor wireless bridges are damaged. You replace the cabling, but soon discover that the EIRP leaving the bridge antenna now exceeds the power output limit. Which of the following is the most likely cause of this issue?

A)You have installed higher-grade cabling.
B)The wireless bridge is also damaged.
C)You have installed lower-grade cabling.
D)The old cable was 50 ohms and the new cable is 75 ohms.

Question 50

Which of the following can be used to mitigate issues arising due to the near/far condition?

A)Increase the power of all stations.
B)Decrease the power of all the stations.
C)Increase the power of remote stations.
D)Increase the power of close-by stations.

Question 51

Concentric zones of variable rate bandwidth coverage exist around an access point due to the up shifting and down shifting of client radio cards between data rates. Which of the following specifies this process?

A)Static rate switching
B)Dynamic rate switching
C)Manual rate selection
D)Progressive rate selection

Question 52

What is the interval between the main wave's arrival at the receiver and the reflected wave's arrival at a receiver called?

A)SIFS
B)Delay spread
C)PIFS
D)Signal spread

Question 53

Which of the following can cause issues associated with roaming?

A)Very small cell coverage overlap
B)Free space path loss
C)CSMA/CA
D)Hidden node

Question 54

Why are most of the access points built with two antennas?

A)To send data and the other to receive data
B)As a standby for reliability
C)To overcome multipath
D)To transmit on two different channels

Question 55

Which of the following best defines Multipath?

A)Negative effects induced on a wireless LAN by reflected RF signals arriving at the receiver along with the main signal
B)Surges in signal strength due to an RF signal taking multiple paths between the sending and receiving stations
C)Receiving station having multiple antennas, which causes the signal to take multiple paths to the CPU
D)Result of using a signal splitter to create multiple signal paths between sending and receiving stations

Question 56

Why should you disable the two lowest rates on an 802.11b/g access point?

A)To avoid noise in a coverage cell
B)To enable collision detection in a coverage cell
C)To enable hidden nodes to hear stations at the other end of coverage cell
D)To avoid co-channel interference in a coverage cell

Question 57

Which of the following can be done to fix the hidden node problem?

A)Increase the power on the access point.
B)Move the hidden node station within transmission range of the other stations.
C)Decrease power on all client stations.
D)Decrease power on the hidden node station.

Question 58

Which of the following is not a criterion for WEP implementation, as per the 802.11 standard?

A)Exportable format
B)Reasonably Strong security
C)Self-Synchronizing feature
D)Mandatory encryption

Question 59

Which of the following is a key rotation option implemented by various manufacturers for encryption key generation?

A)Per-packet
B)Per-user
C)Per-broadcast
D)Per-frame

Question 60

Which of the following is the level of encryption when using a WEP key with a 40-bit secret key concatenated with the initialization vector to form the WEP key?

A)24-bit
B)40-bit
C)64-bit
D)128-bit

Question 61

Which of the following information on a wireless LAN is encrypted and WEP-enabled?

A)The MAC addresses of the frame
B)Beacon management frames
C)The data payload of the frame
D)Shared Key challenge plaintext

Question 62

Which of the following are the three types of filtering that can be performed on a wireless LAN?

A)MAC address, manufacturer hardware, and SSID filtering
B)Protocol, SSID, and WEP filtering
C)SSID, MAC address, and Protocol filtering
D)WEP, 802.11 standard, and manufacturer hardware filtering

Question 63

Why is SSID filtering not considered a secure form of access control?

A)SSID is uni-casted in the clear to every access point beacon by default.
B)The SSID of a wireless LAN client must match the SSID on the access point in order for the client to authenticate and associate to the access point.
C)SSID of a network can be easily found out using a protocol analyzer.
D)SSID encryption is easy to decrypt using freeware utilities.

Question 64

Which of the following is the best solution to mitigate a jamming attack?

A)Use a spectrum analyzer to locate the RF source and then remove it.
B)Increase the power on the wireless LAN to overpower the jamming signal.
C)Shut down the wireless LAN segment and wait for the jamming signal to dissipate.
D)Arrange for the FCC to shut down the jamming signal's transmitter.

Question 65

Why should access points be connected to switches instead of hubs?

A)Hubs are faster than switches and can handle high-utilization networks.
B)Hubs are full duplex and switches are only half duplex.
C)Hubs are broadcast devices and pose an unnecessary security risk.
D)Access points are not capable of full-duplex mode.

Question 66

Which of the following should you use to reduce the time taken to rotate WEP keys across an enterprise network?

A)Distributed Encryption Key Server
B)Router Access Control List
C)Centralized Encryption Key Server
D)Filter Application Server

Question 67

Where should you position the enterprise wireless gateway on the wired network segment?

A)Between the access point and the wired network upstream
B)Between the access point and the wireless network clients
C)Between the switch and the router on the wireless network segment
D)In place of a regular access point on the wireless LAN segment

Question 68

Which of the following specifies why a site survey is a prime requirement for installing a wireless LAN?

A)To justify the need for a wireless LAN
B)To determine the range, coverage, and potential RF interference sources
C)To enable the RF equipment to operate in accordance with the manufacturer's specifications
D)To ensure there is some documentation on the wireless LAN

Question 69

Which of the following specifies how networks use the 802.1x protocol to control network access?

A)Per-user
B)Per-port
C)Per-MAC Address
D)Per-SSID

Question 70

Which of the following statements is not true regarding wireless LAN security?

A)WEP cannot provide a complete security solution.
B)A wireless environment protected with only WEP is not a secure environment.
C)The 802.11 standard specifies user authentication methods.
D)User authentication is the weakest link in a wireless LAN.

Question 71

Which of the following wireless LAN user authentication methods provides maximum security?

A)Device independent user names and passwords
B)SSID
C)MAC addresses
D)SSID and MAC address

Question 72

Which of the following is not a good reason to implement centralized encryption key servers?

A)Centralized key generation
B)Centralized key distribution
C)Centralized key coding and encryption
D)Reduced key management overhead

Question 73

Which of the following should not be considered as a potential RF obstruction?

A)Fire doors
B)A group of Wireless LAN users
C)Metal blinds
D)Metal-mesh windows

Question 74

Which of the following parameters should you record to perform a site survey?

A)Microwave energy levels
B)Noise floor
C)Signal-to-noise ratio
D)Noise margin

Question 75

Which of the following should be tested during an RF site survey?

A)RF coverage with stationery vehicles
B)RF coverage with microwave oven OFF
C)RF coverage with 2.4 GHz phone ON
D)RF coverage with 2.4 GHz phone OFF

Question 76

Which of the following items should not be recorded as part of an RF site survey?

A)A/C power outlets and grounding points
B)Names of all wireless LAN users
C)Potential RF obstructions
D)Potential RF sources

Question 77

Which of the following best defines a data rate boundary?

A)It is the point at which the data rate is decreased or increased to the next acceptable rate in order to maintain the fastest viable RF link.
B)It is the line after which data is no longer passed to the wireless LAN infrastructure.
C)It is the boundary between 2 separate wireless LAN RF coverage cells.
D)It is the square areas of coverage denoted on the facility floor plan where access points are installed.

Question 78

How many access points does a basic service set have?

A)1
B)2
C)3
D)Unlimited

Question 79

Which of the following specifies when you should use an Omni-directional antenna?

A)All horizontal directions from the antenna should form a coverage zone.
B)A specific direction from the antenna should form the coverage zone.
C)More than 5 miles of coverage zone is required in a single direction.
D)For short range coverage of clients who are stationary

Question 80

Which of the following best defines antenna beamwidth?

A)Width of the antenna main element
B)Width of the RF signal beam that the antenna transmits
C)Width of the mounting beam on which the antenna is mounted
D)Width of the beam of the RF signal relative to the Earth's surface