2022年更新のCWNA-108問題集合格保証付きで合格できます！
CWNA-108試験問題集を試そう！ベストCWNA-108試験問題トレーニングを提供しています
質問 92
What factor does not influence the distance at which an RF signal can be effectively received?
- A. Receiving station's radio sensitivity
- B. Receiving station's output power
- C. Transmitting station's output power
- D. Free Space Path Loss
正解: A
質問 93
You are troubleshooting a problem with interference from a non-802.11 device. Given that the device is not a WLAN device, you cannot use a protocol analyzer and have chosen to use a spectrum analyzer. You want to view the signal from the interfering device over time to sec the activity that it is generating. What common spectrum analyzer view should you use for this analysis?
- A. Clients
- B. Real-Time FFT
- C. APs
- D. Waterfall/Spectrogram
正解: D
質問 94
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 access points are configured to disallow 5 GHz.
- B. The client drivers are faulty and should be upgraded.
- C. The clients are configured to use WPA and 5 GHz channels only support WPA2.
- D. The antennas in the laptop have insufficient gain to detect the 5 GHz signals.
正解: D
解説:
Explanation/Reference:
質問 95
As a consultant, you've been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability. What information should be considered to help them choose the right WLAN client devices?
- A. 802.11ac devices support the features of the VHT PHY only in the 5 GHz frequency band.
- B. When HR/DSSS devices are present, VHT MCS rates are disabled for the entire BSS.
- C. 802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a
- D. 802.11ac is not backwardly compatible with 802.11n or 802.11a.
- E. In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both
2.4 and 5 GHz frequencies
正解: A
質問 96
What is a channel mode specified by the 802.11n (High Throughput) PHY?
- A. Frequency Hopping
- B. 20/40 MHz
- C. 80 MHz
- D. 22 MHz
正解: B
質問 97
You are selecting antennas for a WLAN operating in the 5 GHz frequency band. What specifications should be evaluated for an antenna before it is implemented in this WLAN system?
- A. Impedance in Ohms
- B. TPC support
- C. 802.11ad compatibility
- D. Return Loss Rating
正解: A
質問 98
What security method is commonly used for VoIP handsets when the infrastructure does not support OKC or FT roaming?
- A. WPA2-Enterprise with EAP-TLS
- B. WPA2-Enterprise with PEAP
- C. WPA2 -Personal
- D. WPA2-Enterprise with EAP-TTLS
正解: A
質問 99
You have been tasked with creating a wireless link between two buildings on a single campus. The link must support at least 150 Mbps data rates. What kind of WLAN technology role should you deploy?
- A. WPAN
- B. IBSS
- C. Access BSS
- D. Wireless bridging
正解: D
質問 100
In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?
- A. Capacity analysis results
- B. Application Layer protocol availability analysis results
- C. Layer 4 protocol availability analysis results
- D. WAN interface analysis results
正解: A
解説:
Explanation/Reference:
質問 101
You are deploying a WLAN with the access points configured for 10 mW of output power on the 2.4 GHz radios and 20 mW of output power on the 5GHz radios. Some semi-directional antennas are also in use. What kind of deployment is described?
- A. Residential
- B. SOHO
- C. Standard office
- D. High density
正解: B
質問 102
You are reporting on the RF environment in you facility. The manager asks you do describe the noise floor noted in the report. Which of the following is the best explanation?
- A. The noise caused elevators, microwave ovens, and video transmitters.
- B. The RF energy that exists in the environment from intentional and unintentional RF radiators that forms the baseline above which the intentional signal of your WLAN must exist.
- C. The extra energy radiated by access points and clint devices beyond that intended for the signal.
- D. The energy radiated by flooring materials that causes interference in the 2.4 GHz and 5 GHz bands.
正解: B
質問 103
An IEEE 802.11 amendment is in the draft state. What impact does this draft amendment have on the 802.11 standard?
- A. No impact: Until an amendment is ratified, it does not become part of the standard.
- B. No impact: Draft amendments do not become part of the standard until a working group is formed.
- C. Devices will be released based on the draft amendment and the draft amendment features are part of the standard.
- D. The standard is changed to reflect the new capabilities as soon as amendment enters the draft stage.
正解: A
質問 104
In a long-distance RF link, what statement about Fade Margin is true?
- A. The Fade Margin of a long-distance radio link should be equivalent to the receiver's low noise filter gain.
- B. The Fade Margin is a measurement of signal loss through free space and is a function of frequency and distance.
- C. Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading.
- D. A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel zone is clear of obstructions.
正解: C
質問 105
You are implementing a VHT-capable AP. Which one of the following channels is available in the 802.11-
2016 standard that was not available before the ratification of 802.11 ac?
- A. 0
- B. 1
- C. 2
- D. 3
正解: B
質問 106
What can an impedance mismatch in the RF cables and connectors cause?
- A. Fewer MCS values in the MCS table
- B. Increased amplitude of the RF signal
- C. Increased range of the RF signal
- D. Excessive VSWR
正解: D
質問 107
When using a spectrum to look for non Wi-Fi interference sources, you notice significant interference across the entire 2.4 GHz band (not on a few select frequencies) within the desktop area of a users workspace, but the interference disappears quickly after just 2 meters. What is the most likely cause of this interference?
- A. Excess RF energy from a nearby AP
- B. USB 3 devices in the user's work area
- C. Unintentional radiation from the PC power supply
- D. Bluetooth devices in the user's work area
正解: C
質問 108
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
- A. Legacy Power Save mode was removed in the 802.11ac amendment.
- B. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low powerstate.
- C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
- D. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
正解: A
質問 109
The IEEE 802.11-2012 standard requires VHT capable devices to be backward compatible with devices using which other 802.11 physical layer specification (PHY)?
- A. ERP-PBCC
- B. DSSS
- C. OFDM
- D. HR/DSSS
正解: C
質問 110
Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive design software for the task, but the company insists on a pre- deployment site visit. What task should be performed as part of the pre-deployment visit to prepare for a predictive design?
- A. Test several antenna types connected to the intended Aps for use in the eventual deployment
- B. Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls
- C. Collect information about the company's security requirements and the current configuration of their RADIUS and user database servers
- D. Evaluate the building materials at ABC's facility and confirm that the floor plan documents are consistent with the actual building
正解: D
質問 111
When a client moves to a new BSS within an ESS, what step is a part of the 802.11 reassociation process?
- A. The new access point transmits a Reassociation Response to the client station with a status value.
- B. The current access point triggers the client's reassociation service.
- C. The client station transmits a Reassociation Request frame to its currentaccess point.
- D. The current access point informs the IP gateway of the reassociation.
正解: A
質問 112
What is an advantage of using WPA2-Personal instead of WEP-128 as a security solution for
802.11 networks?
- A. WPA2-Personal uses CCMP for encryption, and WEP-128 uses TKIP for encryption
- B. WPA2-Personal uses 802.1X/EAP for authentication, and WEP-128 uses preshared keys
- C. WPA2-Personal uses dynamic encryption keys, and WEP-128 uses static keys
- D. WPA2-Personal is based on IEEE 802.11 industry standards, but WEP is not
正解: C
質問 113
You are evaluating a connection that states the data rate is 150 Mbps. What is the expected throughput of this connection?
- A. 150 Mbps because the data rate is equal to the throughput
- B. 54 Mbps because that is the actual maximum throughput of an 802.11 connection
- C. Less than 150 Mbps because of 802.11 overhead and contention
- D. More than 150 Mbps because of compression
正解: C
質問 114
In addition to coverage analysis results, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?
- A. Capacity analysis results
- B. Application Layer protocol availability analysis results
- C. Layer 4 protocol availability analysis results
- D. WAN interface analysis results
正解: A
質問 115
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