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CWNA Take This Test 1

Terms in this set (116)

What statement about the beamwidth of an RF antenna is true?

A. The horizontal and vertical beamwidth are measured where the
main lobe loses 6 dB of power.

B. Beamwidth has no impact on the propagation pattern.

C. Horizontal beamwidth is displayed on the Elevation chart.

D. As the gain of the antenna increases, the beamwidth decreases
in either the horizontal or vertical direction or both.
As the gain of the antenna increases, the beamwidth decreases in either the horizontal or vertical direction or both.
What is true about WPA in 802.11 wireless networks?

A. WPA implements AES encryption in the same way that WEP does.

B. WPA is based on CCMP/AES and is non-deprecated in the 802.11-2016 standard.

C. When WPA is used, 802.11n and 802.11ac devices fall back to 54 Mbps as the highest data rate.

D. WPA is based on TKIP/RC4 and is non-deprecated in the 802.11-2016 standard.
When WPA is used, 802.11n and 802.11ac devices fall back to 54 Mbps as the highest data rate
When an 802.11 amendment is ratified, what happens to the standard?

A. The amendment specifications are optional and never become part of a rollup update.

B. The standard includes the specifications of the amendment even though they are not included in a rollup update initially.

C. Device manufacturers must wait until the next rollup to include the amendment specifications in chipsets and drivers.

D. Amendments are created to resolve errors in the standard and introduce no new features.
The standard includes the specifications of the amendment even though they are not included in a rollup update initially.
You are implementing a VHT-capable AP. When operating in VHT mode, which one of the following channels is not available for use by the AP?

A. 153

B. 144

C. 11

D. 56
11
What statement is true regarding the use of the ERP PHY in 802.11 networks?

A. ERP operates in either 2.4 GHz or 5 GHz and supports a maximum data rate of 54 Mbps.

B. ERP is identical to OFDM PHY, except it operates in the 5 GHz band whereas OFDM operates in the 2.4 GHz band.

C. ERP uses 256-QAM modulation to achieve the maximum data rate of 54 Mbps.

D. ERP operates only in the 2.4 GHz band and supports a maximum data rate of 54 Mbps.
ERP operates only in the 2.4 GHz band and supports a maximum data rate of 54 Mbps.
Which IEEE 802.11 Physical Layer (PHY) supports frequency use below 1 GHz and is optimal for low data rate long range communications?

A. VHT

B. HT

C. S1G

D. DMG
S1G
An 802.11-based network includes two laptops, one mobile phone, and one tablet. No AP is involved in the communications. What WLAN use case is described?

A. BSS

B. IBSS

C. ESS

D. WWAN
ESS
When a controller-based WLAN is in use and roaming is desired with 802.1X/EAP, what solution may be used to implement fast and secure roaming?

A. OKC

B. DFS

C. TPC

D. WMM
OKC
What can a client device use to determine whether a BSS supports WMM QoS capabilities?

A. Control frame analysis of existing associated STAs

B. Data frame analysis of existing associated STAs

C. QoS Query frames

D. Beacon frame information
Beacon frame information
How can a transmitting client STA determine whether a data frame transmitted to the AP was delivered or not?

A. If the AP transmits any other frames, the STA can assume it received the transmitted frame.

B. If no collision was detected, the data frame was delivered.

C. If a matching Ack frame is received, the data frame was delivered.

D. Frames are always delivered on the WM, so the STA can assume delivery.
If a matching Ack frame is received, the data frame was delivered.
What metric or parameter is not likely to be used by a client STA when selecting a BSS to which it will connect?

A. Retry rate

B. RSSI

C. Beacon frame signal strength

D. Supported data rates
Retry rate
What original authentication method of the 802.11-1997 standard is still included in the standard and non deprecated?

A. CCMP

B. WEP

C. Shared Key Authentication

D. Open System Authentication
Open System Authentication
When an 800 nanosecond delay is inserted between symbols, what is certainly in use?

A. DIFS

B. Long guard interval

C. SIFS

D. Short guard interval
Long guard interval
What is used to synchronize the receiver for reception of an 802.11 PPDU?

A. Preamble

B. PLCP header

C. MAC header

D. FCS
Preamble
What new feature introduced with 802.11ac was designed to improve power management in the 5 GHz band?

A. 8 stream MIMO

B. 256-QAM

C. VHT TXOP

D. Consistent use of A-MPDU
VHT TXOP
When an 802.11 STA received a frame not intended for it, what field indicates the length of time required to complete the frame transaction after the current frame being received?

A. Duration/ID

B. Length

C. Type

D. Retry
Duration/ID
What kind of 802.11 device is most likely to have multiple LAN switch ports, a WAN/Internet port, and dual-band 802.11 radios?

A. Enterprise AP

B. WLAN bridge

C. Home WLAN router

D. Mesh AP
Home WLAN router
What Wi-Fi Alliance certification/standard can be used by hotspots to allow client devices to connect automatically if the hotspot supports a subscription service to which the client is subscribed?

A. Voice-Enterprise

B. WMM

C. WPA2

D. Passpoint
Passpoint
A temporary mobile office is being deployed. In addition to the local WLAN, what will be required to provide Internet access at the site among the listed options?

A. Ethernet switches and IP routers

B. Wireless backhaul

C. RADIUS server

D. LDAP server
Wireless backhaul
When implementing PoE, what role is played by a wireless AP?

A. PSE

B. PD

C. Midspan injector

D. Power splitter
PD
You have several 802.11n AP's that require only 802.3af PoE power. What is the minimum power that is expected to be available for the PD in this scenario assuming proper cable lengths are used?

A. 30 W

B. 15.4 W

C. 25.5 W

D. 12.95 W
12.95 W
What high availability solution uses one controller as a backup for several other controllers in case a controller fails?

A. RAID5

B. N+1

C. Striping

D. Clustering
N+1
When centralized data forwarding is used in a controller-based architecture, what device creates the 802.3 Ethernet frames, removing all 802.11- specific information, and properly tags them with QoS markings to be forwarded onto the final destination?

A. AP

B. Client

C. Controller

D. IP router
Controller
In an 802.11 2.4 GHz system, what 20 MHz channels are considered non-overlapping?

A. 1 and 5

B. 3 and 6

C. 4 and 9

D. 2 and 5
4 and 9
If the center frequency of channel 2 is 2417 MHz, what is the center frequency of channel 5?

A. 2485

B. 2412

C. 2420

D. 2432
2432
You must enable a feature on APs that allows for higher data rate clients to receive more time for frame reception from the APs than lower data rate clients. What is this feature?

A. Load Balancing

B. Band Steering

C. AirTime Fairness

D. RTS/CTS
AirTime Fairness
You are implementing an MDM solution. For what might this be used?

A. High availability for controllers

B. BYOD

C. VPN endpoint

D. Automatic channel selection
BYOD
The documentation from your WLAN vendor indicates that the time clocks on all devices must be synchronized. What service may be used on the network to perform this action?

A. DNS

B. NTP

C. RADIUS

D. LDAP
NTP
What statement is true about the Ethernet cables used for AP connectivity?

A. If you use CAT6 cabling, you can install 250 meter cable runs instead of the 100 meter limit of CAT5e.

B. PoE can operate across CAT5e cables, but CAT3 cables are sufficient for providing 802.3at PoE power.

C. The minimum required Ethernet cable type for 802.11ac APs is CAT3.

D. CAT6 Ethernet cables provide superior performance to CAT5 Ethernet cables.
CAT6 Ethernet cables provide superior performance to CAT5 Ethernet cables.
What configuration option is sometimes thought to be a security solution for WLANs, but is easily circumvented by attackers?

A. CCMP

B. WPA2

C. EAP-TLS

D. SSID hiding
SSID hiding
What protocol should be used for Web-based administration interfaces in order to increase security?

A. HTTPS

B. HTML

C. HTTP

D. SNMPv3
HTTPS
What encryption algorithm is used by WPA2- Enterprise in secure WLANs using no deprecated 802.11 solutions?

A. AES

B. RC4

C. DES

D. 3DES
AES
When using 802.1X/EAP authentication, what is the most common authentication server used in organizations?

A. AD DS Domain Controller

B. TACACS

C. RADIUS

D. Controller
RADIUS
What solution can detect and mitigate rogue devices discovered on the WLAN?

A. LDAP server

B. RTLS server

C. Host-based IDS

D. WIPS
WIPS
When using a protocol analyzer, what should you look at to see the duration value for a particular data frame in the capture?

A. Expert views

B. Traffic flows

C. Packet decode

D. Traffic statistics
Packet decode
What is the most common metric given for maximum unidirectional delay in VoIP communications?

A. 150 ms

B. 300 ms

C. 50 ms

D. 10 ms
150 ms
Which one of the following is a kind of 802.11-based interference caused by 802.11 devices?

A. RFID

B. ZigBee

C. Bluetooth

D. ACI
ACI
What is an important consideration when determining the impact of a non-Wi-Fi interferer on the 802.11 channels nearby?

A. Protocols used by the interferer

B. Frequencies used by the interferer

C. Coding rate used by the interferer

D. Age of the interfering device
Frequencies used by the interferer
You have implemented a real-time video conferencing system on your WLAN. What two factors will be most important to the quality of communications in this system?

A. Throughput and reliability

B. Latency and jitter

C. Authentication and encryption

D. Latency and encryption
Throughput and reliability
What is the primary difference between throughput testing and load testing?

A. Throughput testing is often a single machine test and load testing includes a simulated production load.

B. Throughput testing provides no value while load testing does provide value.

C. Throughput testing is not supported on WLANs, but load testing is.

D. Load testing is not supported on WLANs, but throughput testing is.
Throughput testing is often a single machine test and load testing includes a simulated production load.
When using wireless design software for post implementation validation, what is performed that is not performed in predictive modeling design scenarios?

A. Capture of signals within the physical space

B. Calibration or scaling of the floor plan

C. Drawing walls and other materials

D. Indicating AP locations
Capture of signals within the physical space
After performing corrective actions, according to the CWNP troubleshooting methodology, what action should be taken next?

A. Verify the solution

B. Document the results

C. Discover the scale of the problem

D. Define possible causes
Verify the solution
What is the first step in the CWNP troubleshooting methodology?

A. Document the results

B. Verify the solution

C. Identify the problem

D. Define possible causes
Identify the problem
You are troubleshooting a performance problem experienced by several STA's in an area approximately five square meters in size. You want to see if a non-Wi-Fi interferer is in the space. What tool should you use?

A. WLAN scanner

B. WLAN protocol analyzer

C. Spectrum analyzer

D. Throughput tester
Spectrum analyzer
What is an advantage of a centralized WLAN monitoring solution that is not available in most laptop-based protocol analyzers?

A. Frame capture and decoding

B. Expert views

C. Data aggregation from multiple real-time sources for automated reporting and analysis

D. Traffic statistics for the BSA
Data aggregation from multiple real-time sources for automated reporting and analysis
What will decrease in an environment when the noise floor increases?

A. Signal strength

B. SNR

C. Transmit power

D. Antenna gain
SNR
What is a common solution to hidden node problems in WLANs?

A. Reducing the client output power

B. Enabling RTS/CTS

C. Reducing the client antenna gain

D. Increasing the AP fragmentation threshold
Enabling RTS/CTS
You have determined that an AP is not getting sufficient PoE power because it will not power up. You have verified that the CAT6 cable is only 30 meters in length and is connected to a switch port with PoE enabled. What should you check next?

A. Verify that the CAT6 cable is blue and not yellow

B. Verify that the midspan injector is powered on

C. Verify that the power budget in the switch has sufficient remaining power for the AP

D. Verify that the AP has the "use PoE" hardware switch set to "on"
Verify that the power budget in the switch has sufficient remaining power for the AP
You are troubleshooting a problem with a USB adapter on a laptop. When you insert the adapter, after having installed the drivers, it is not detected by the operating system and no wireless networks are shown. The adapter has been tested on another machine where it works properly. What is a practical next action to take in this scenario?

A. Reinstall the operating system on the problem laptop

B. Delete the driver from the problem laptop and use the adapter without a driver

C. Install a third-party supplicant to use the adapter in the problem laptop

D. Check the driver version in use on the working computer and ensure the same driver version is used on the problem laptop
Check the driver version in use on the working computer and ensure the same driver version is used on the problem laptop
An RF wave is weaker after traveling through some material in its path, what is the term used to describe what happened as the RF wave passed through the material?

A. Reflection

B. Refraction

C. Scattering

D. Absorption
Absorption
What occurs naturally as an RF wave travels through space between antennas?

A. VSWR

B. FSPL

C. Amplification

D. Phase altering
FSPL
(Free Space Path Loss)
What is a relative unit of measurement that allows comparison of the amplitude between two signals?

A. dB

B. RSSI

C. dBm

D. mW
dB
An AP transmits with an output power level of 25 mW and uses a 3 dBi antenna. What is the EIRP?

A. 3 dBm

B. 5 dBm

C. 10 dBm

D. 17 dBm
17 dBm
When an RF link in a bridging implementation spans more than 7 miles, what must be considered that need not typically be considered otherwise?

A. Earth bulge

B. FSPL

C. SNR

D. Output power
Earth bulge
What phrase defines an Intentional Radiator?

A. The power output from the radio into the RF cable

B. The power output from the antenna

C. The power provided to the antenna including radio output power and all cable and connector losses

D. The power received by the receiving antenna
The power provided to the antenna including radio output power and all cable and connector losses
What multi-antenna technology used at the transmitter to improve the signal received at the receiver was first introduced in 802.11n and standardized on a single option in 802.11ac?

A. Transmit beamforming

B. MRC

C. STBC

D. Diversity
Transmit beamforming
What new transmission technology was introduced in 802.11ac that allows for an AP to transmit to more than one client STA concurrently?

A. TxBF

B. MIMO

C. MU-MIMO

D. MRC
MU-MIMO
When installing an omni-directional SISO antenna for outdoor coverage, what kind of mount is commonly used that includes u-brackets?

A. Ceiling mount

B. Pole/mast mount

C. Wall mount

D. Desktop mount
Pole/mast mount
What organization certifies equipment to inter-operate with other 802.11-based equipment?

A. IEEE

B. IETF

C. FCC

D. Wi-Fi Alliance
Wi-Fi Alliance
When a new PHY is to be created for the 802.11 standard, what is formed first?

A. Draft

B. Working group

C. Ratified amendment

D. Proposals
Working group
What PHY operates in 2.4 GHz and is capable of a maximum of 11 Mbps?

A. HT

B. ERP

C. HR/DSSS

D. DSSS
HR/DSSS
In addition to modulation, guard interval, channel width, and the number of spatial streams, what impacts the data rate according to the 802.11-2016 MCS tables?

A. RSSI

B. Signal strength

C. Coding

D. Noise floor
Coding
What 2.4 GHz channels are available worldwide in all regulatory domains?

A. 1 through 14

B. 1 through 13

C. 1 through 12

D. 1 through 11
1 through 11
When multiple AP's are used with a shared distribution system, such as Ethernet, what kind of WLAN service set is in use?

A. ESS

B. IBSS

C. Ad-hoc

D. Mesh BSS
ESS
What is typically mapped to the MAC address of the AP when only a single BSS is implemented by the AP?

A. SSID

B. BSSID

C. ESSID

D. DSM
BSSID
What kind of roaming may take place and include Layer 1 roaming?

A. Band roaming from 2.4 GHz to 5 GHz

B. Roaming from Wi-Fi to Ethernet

C. Roaming from Wi-Fi to Token Ring

D. No roaming involves Layer 1
Band roaming from 2.4 GHz to 5 GHz
When is an authentication response frame used?

A. When an authentication request frame has been received

B. When a client accidentally disconnects from the AP

C. The 802.11 standard only specifies an authentication
frame and not request and response frames for authentication

D. When a probe request frame is received
The 802.11 standard only specifies an authentication
frame and not request and response frames for authentication
What is required before a Block Acknowledgement can be used?

A. 802.11g must be the active PHY

B. 802.11i must be implemented in the BSS

C. A sounding exchange must take place

D. A block acknowledgement request exchange must take place
A block acknowledgement request exchange must take place
A client STA is sending Probe Request frames on several channels. What kind of WLAN scanning is in use?

A. Active scanning

B. Passive scanning

C. Port scanning

D. Channel pruning
Active scanning
What is the basic process of Open System authentication?

A. Authentication request, ID request, ID response, Authentication response, Association request, and Association response

B. Authentication request, Authentication response, Association request, and Association response

C. Authentication request, Association response

D. Authentication request, Probe response, Association request, Probe response
Authentication request, Authentication response, Association request, and Association response
What defines data rates for HT and VHT devices?

A. They are fixed at 150, 180 and 240 Mbps

B. They are fixed at 1, 2, 5.5 and 11 Mbps

C. MCS tables

D. PHY parameter tables
MCS tables
What is in HT and VHT PHY preambles that allows for the synchronization of the receiving radio?

A. Length field

B. Data rate specification

C. Duration field

D. Training fields
Training fields
What inter-frame space is used before an Ack frame?

A. DIFS

B. SIFS

C. AIFS

D. EIFS
SIFS
What is used to determine the number of slot times used in the formula to calculate an AIFS duration when EDCA is used?

A. Data rate

B. Frame duration

C. AIFS number (AIFSN)

D. The AIFS duration is fixed for each PHY
AIFS number (AIFSN)
What kind of WLAN management solution does not include centralized 802.11 MAC processing of any kind, but does include centralized configuration of the AP's without the use of the Internet?

A. Cloud-based

B. Controller-based

C. WNMS-based

D. Virtual controller-based
WNMS-based
A push-to-talk device has similar requirements most alike to what other common WLAN client device?

A. Laptop with standard data applications

B. VoIP handset

C. Handheld scanners

D. 802.11 video cameras
VoIP handset
When implementing a WLAN for corporate data access, you are planning for WPA2 implementation. What issue related to planning corporate data access are you considering?

A. Ensure sufficient coverage

B. Ensure sufficient throughput

C. Ensure sufficient security

D. Ensure availability
Ensure sufficient security
When implementing a WLAN bridge link you must ensure 60% clearance of what defined zone?

A. BSA zone

B. Fresnel zone

C. Antenna height zone

D. PoE zone
Fresnel zone
You are deploying an RTLS solution. What is an important requirement of most RTLS implementations?

A. Sensors placed around the facility perimeter

B. Use of at least one sensor for every STA

C. Use of at least two sensors for every AP

D. Implementation of VPN connectivity from the sensors to the monitoring server
Sensors placed around the facility perimeter
You have implemented a feature on the AP's that temporarily ignores 2.4 GHz probe requests in order to direct more client STA's to 5 GHz channels. What is this feature?

A. AirTime Fairness

B. RRM

C. Passpoint

D. Band Steering
Band Steering
What can you do to help mitigate DHCP pool depletion issues without requiring user configuration actions?

A. Implement shorter lease duration's

B. Implement longer lease duration's

C. Implement smaller scopes

D. Use DHCP for wired clients only and ask guests to manually configure IP settings
Implement shorter lease duration's
In addition to mapping IP addresses to host names for client devices, what may DNS be used for in a controller-based environment?

A. Location of controllers by AP's

B. Configuring IP settings in client devices

C. Synchronizing time clocks

D. Encrypting Internet communications
Location of controllers by AP's
When implementing SSIDs in APs, to what are they typically mapped for better control of access to resources on the LAN?

A. IP addresses

B. MAC addresses

C. VLANs

D. User profiles
VLANs
What may force an organization to implement a PKI for practical application in a WLAN?

A. The use of EAP-TLS

B. The use of PEAP

C. The use of WPA2-Personal

D. The use of frame aggregation
The use of EAP-TLS
What feature of WLAN APs may provide for automatic negotiation of AP channel and power settings among the APs or within the controllers?

A. Band Steering

B. AirTime Fairness

C. Load balancing

D. RRM
RRM
What common feature of MDM solutions can be used to prevent users from causing data leaks by taking photos of sensitive documents?

A. Self-registration

B. On-boarding

C. Feature management

D. Over-the-air registration
Feature management
Why is it unlikely that an 802.11ac wave 2 AP with four spatial streams will exceed the capacity of a 1 Gbps Ethernet link?

A. Because users just don't use Wi-Fi that much

B. Because the AP will compress data sent onto the wired network

C. Because 802.11 network operations consume significant air time and clients connect at varying data rates resulting in much lower useful data throughput than the maximum data rate of 802.11ac 4 stream AP's

D. Because the 1 Gbps Ethernet link can actually transmit 2 Gbps of data when the down-link and up-link wire pairs are both used for up-link transmission
Because 802.11 network operations consume significant air time and clients connect at varying data rates resulting in much lower useful data throughput than the maximum data rate of 802.11ac 4 stream AP's
What feature of AP's is often thought to be a security solution, but provides no real security because of simple spoofing methods?

A. SSID hiding

B. Shared Key Authentication

C. MAC filtering

D. WEP
MAC filtering
What organization defines the EAP protocol used in enterprise WLAN security?

A. IETF

B. IEEE

C. FCC

D. Wi-Fi Alliance
IETF
What is a primary benefit of EAP-TLS, EAP-TTLS, and PEAP that is not available in WEP and Shared Key Authentication?

A. Encryption

B. Authentication

C. Dynamic encryption keys

D. No certificate requirements
Dynamic encryption keys
What encryption solution is provided in the 802.11 standard and is not deprecated?

A. AES

B. RC4

C. RC5

D. SHA1
AES
What is needed, in addition to the RADIUS server IP address and ports, to configure an AP to use a given RADIUS server?

A. Shared secret

B. RADIUS server MAC address

C. RADIUS server host name

D. VPN type used to connect to the RADIUS server
Shared secret
You wish to administer an AP over the wired network using the CLI. What protocol should you use to prevent eavesdropping on the administrative tasks?

A. Telnet

B. HTTP

C. SSH2

D. SNMPv3
SSH2
A manager has asked you to place the AP's above the ceiling in a WLAN deployment. He has requested this for aesthetic reasons. You know this is not the best decision, what do you tell the manager in an attempt to influence him to make a better decisions?

A. It is impossible to power AP's placed above the ceiling.

B. It is always against regulations to place AP's above the ceiling.

C. Placing the AP's above the cealing will prevent any possible configuration that would allow for client access.

D. Placing the AP's above the ceiling will alter the requirements for the WLAN and may require more AP's than would be otherwise
Placing the AP's above the ceiling will alter the requirements for the WLAN and may require more AP's than would be otherwise
You are using an 802.11 VoIP handset and walking around the facility from end-to-end while on a call. What might you be testing in a newly deployed WLAN?

A. Roaming capabilities

B. Security capabilities

C. Audio noise from RF energy

D. Battery life of the VoIP handset
Roaming capabilities
You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 1 as well. When you document your findings, what term do you use to describe the problem in this configuration?

A. CCI

B. Non-Wi-Fi interference

C. ACI

D. ZigBee interference
CCI
In addition to capacity analysis results, what should be included in a site survey report to ensure WLAN users are provided with connectivity?

A. Application Layer protocol availability analysis results

B. Layer 4 protocol availability analysis results

C. Coverage analysis results

D. WAN interface analysis results
Coverage analysis results
An organization is planning to implement a new WLAN. They will install 20 AP's and place them all on the same IP subnet so no IP roaming will be required for WLAN clients. The DHCP server will use the subnet of 192.168.10.0/24. They expect an average of 18 client STAs per AP. What is your immediate concern with this plan?

A. AP's cannot handle more than 15 STAs per AP

B. The DHCP pool is not large enough

C. IP roaming occurs even when all AP's are on the same IP subnet

D. WLANs must use the 10.x.x.x networks
The DHCP pool is not large enough
When is a three dimensional RF channel plan always required?

A. When the WLAN is near an airport or military base

B. When the WLAN exists in an industrial environment

C. When a multi-floor WLAN is implemented

D. When the Fresnel zone is 80% blocked
When a multi-floor WLAN is implemented
What step comes after "Define the possible causes" when considering the CWNP troubleshooting methodology?

A. Create a plan of action and implement it

B. Narrow to the most likely cause

C. Escalate the problem to the wireless vendor support staff

D. Document the results and close the case
Narrow to the most likely cause
You are passing random UDP data across the WLAN and measuring results with iPerf. What kind of test is most likely being performed?

A. Interference location

B. Signal strength monitoring

C. Throughput test

D. Black box testing
Throughput test
Which one of these is not a good use of a spectrum analyzer?

A. Locating sources of RF interference

B. Determining retry rates on the WLAN

C. Evaluating RF air time utilization in a channel

D. Viewing historical RF activity in a channel
Determining retry rates on the WLAN
In what band do many USB 3 devices cause significant localized (within 3-5 meters) RF interference?

A. 60 Ghz

B. Sub-1 GHz

C. 5 GHz

D. 2.4 GHz
2.4 GHz
You are reporting on the RF environment in your facility. The manager asks you to describe the SNR noted in the report. Which of the following is the best explanation?

A. SNR is the difference between the SOM and the Fade Margin

B. SNR is the difference between the noise in the environment and the RF signal strength

C. SNR is the simple noise reduction algorithm used on filters on 802.11 adapters

D. SNR is the interference caused by USB 3.0 devices
SNR is the difference between the noise in the environment and the RF signal strength
What common building component is likely to cause coverage holes in a WLAN deployment if not considered and resolved in the WLAN design?

A. Windows

B. Cubicle partitions

C. Elevators

D. Tile floors
Elevators
An AP that uses PoE powers up, but upon inspection you notice that only one radio (the 2.4GHz radio) is active. You verify that the configuration has both the 2.4GHz and 5 GHz radios enabled. When you connect the AP to wall power, both radios work as expected. What is a likely cause of this problem?

A. The AP firmware is faulty

B. The external antennas for the 5 GHz radio are not connected

C. Insufficient PoE power

D. WPA is enabled on the 5 Ghz radio, causing it to be disabled
Insufficient PoE power
You administer a WLAN that offers a guest SSID of CORPGUEST. Users connect to the CORPGUEST SSID, but report that they cannot access Internet web sites. The devices indicate no Internet connection. What common problem causes this scenario?

A. NTP issues

B. DNS failure

C. Hardware issues

D. IP routing issues
DNS failure
What is defined as a system used to interconnect a set of BSSs and integrated LANs to create an ESS?

A. WM

B. DFS

C. DS

D. STA
DS
When an RF wave encounters obstacles smaller than the wavelength and reflective in nature, what is likely to occur?

A. Warping

B. Reflection

C. Refraction

D. Scattering
Scattering
What is the term used when measuring return loss caused by mismatched impedance in RF cables and connectors?

A. VSWR

B. EIRP

C. IR

D. Attenuation Factor
VSWR
What metric ultimately determines the data rate that can be achieved between an AP and an STA?

A. SNR

B. Signal Strength

C. Noise Floor

D. Beacon Rate
SNR
What is the output of a link budget?

A. System Cost (SC)

B. Signal-to-Noise-Ratio (SNR)

C. Total Cost of Ownership (TCO)

D. System Operating Margin (SOM)
System Operating Margin (SOM)
A WLAN transmitter that emits a 20 mW signal is connected to a cable with 6 dB loss. If the cable is connected to an antenna with 12 dBi gain, what is the EIRP at the antenna element?

A. 120 mW

B. 80 mW

C. 5 mW

D. 320 mW
80 mW
Why are some WLAN client devices able to receive signals at given data rates that are weaker than other client devices can receive?

A. The device drivers are coded according to better programming practices.

B. The receive sensitivity is better on some devices than others.

C. The output power is higher on some devices than others.

D. The VSWR is higher on devices that can receive weaker signals.
The receive sensitivity is better on some devices than others.
What term describes an RF transmission system up to but not including the antenna?

A. Chipset

B. Radio

C. EIRP

D. Intentional Radiator
Intentional Radiator
What kind of MIMO antennas are typically used for WLAN deployments when the antennas are placed central to the target coverage area?

A. Patch

B. Grid

C. Omni-directional

D. Panel
Omni-directional
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