[2023年12月19日] 更新されたCWNA-108試験PDF問題集にはFast2test合格保証付き [Q49-Q70]

[2023年12月19日] 更新されたCWNA-108試験PDF問題集にはFast2test合格保証付き

あなたを合格させるCWNP試験にはCWNA-108試験問題集

CWNP CWNA-108（CWNP認定ワイヤレスネットワーク管理者）認定試験は、ワイヤレスネットワーキングの専門知識を確立したい個人向けに設計された世界的に認められた認定プログラムです。この認定は、ワイヤレス業界でのキャリアを昇進させ、ワイヤレスネットワークの管理に関する知識とスキルを向上させたいITプロフェッショナルに最適です。 CWNA認定は、ワイヤレスネットワークを設計、インストール、構成、およびトラブルシューティングする個人の能力を検証します。

質問 # 49
What authentication method is referenced in the 802.11-2016 and 802.11-2020 specifications and is recommended for robust WI-AN client security?

A. SSL
B. IPSec
C. 802.1X/EAP
D. WEP

正解：C

解説：
Explanation
The authentication method that is referenced in the 802.11-2016 and 802.11-2020 specifications and is recommended for robust WLAN client security is 802.1X/EAP. 802.1X/EAP stands for IEEE 802.1X Port-Based Network Access Control with Extensible Authentication Protocol and is a framework that provides strong authentication and dynamic encryption key generation for WLAN clients. 802.1X/EAP involves three parties: the supplicant (the client), the authenticator (the AP or the controller), and the authentication server (usually a RADIUS server). The supplicant sends its credentials (such as username and password, certificate, or token) to the authenticator, which forwards them to the authentication server. The authentication server verifies the credentials and sends a response to the authenticator, which grants or denies access to the supplicant. The authentication server also generates a master key that is used to derive encryption keys for the data frames between the supplicant and the authenticator. 802.1X/EAP supports various EAP methods that offer different levels of security and flexibility, such as EAP-TLS, EAP-PEAP, EAP-TTLS, EAP-FAST, and EAP-SIM. SSL, IPSec, and WEP are not authentication methods, but rather encryption or security protocols that are not specific to WLANs or referenced in the 802.11 specifications. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 299; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 289.

質問 # 50
Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

A. RADIUS
B. LDAP
C. DNS
D. DHCP

正解：D

質問 # 51
What is appended to the end of each 802.11 data frame after the payload?

A. FCS
B. Preamble
C. PHY header
D. MAC header

正解：A

解説：
Explanation
The FCS (Frame Check Sequence) is appended to the end of each 802.11 data frame after the payload. The FCS is a 4-byte field that contains a CRC-32 (Cyclic Redundancy Check) value that is calculated based on the contents of the MAC header and the payload of the frame. The FCS is used by the receiver to verify the integrity of the frame and to detect any errors or corruption that may have occurred during transmission. If the FCS does not match with the expected value, the frame is discarded by the receiver. References: , Chapter 4, page 139; , Section 4.2

質問 # 52
What advantages does using predictive site survey modeling software offer over performing a manual site survey? (Choose 2)

A. Predictive modeling software makes it simple to assess multiple different AP locations and then adjust and display the AP's expected coverage pattern in almost real-time.
B. It takes less time to create an initial site survey for a large facility when using predictive modeling software than when performing a manual survey.
C. Predictive modeling software can predict the ideal access point location 100% of the time, whereas the results from manual surveyingare less reliable.
D. Predictive modeling software provides more reliable data than manual surveys when fine-tuning and validating access point placement after the installation.
E. The exact impact of interference sources from external networks can be more accurately measured when using predictive modeling software than with manual surveys.

正解：A、B

質問 # 53
Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

A. OFDM (802.11a)
B. VHT (802.11ac)
C. HT (802.11n)
D. DSSS (802.11-Prime)

正解：C

解説：
Explanation
The HT (802.11n) physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS. ERP stands for Extended Rate PHY, which is an extension of the original DSSS (Direct Sequence Spread Spectrum) PHY that supports data rates up to 54 Mbps in the 2.4 GHz band. HR/DSSS stands for High Rate/Direct Sequence Spread Spectrum, which is another extension of DSSS that supports data rates up to 11 Mbps in the 2.4 GHz band. HT stands for High Throughput, which is a new PHY that supports data rates up to 600 Mbps in both the 2.4 GHz and 5 GHz bands. HT uses OFDM (Orthogonal Frequency Division Multiplexing) as its modulation scheme, but it also supports legacy DSSS and ERP devices by using a dual preamble and header structure that allows backward compatibility. References: , Chapter 3, page 103; , Section 3.1

質問 # 54
What can an impedance mismatch in the RF cables and connectors cause?

A. Increased amplitude of the RF signal
B. Fewer MCS values in the MCS table
C. Excessive VSWR
D. Increased range of the RF signal

正解：C

解説：
Explanation
VSWR stands for Voltage Standing Wave Ratio, which is a measure of how well the impedance of the RF cable and connectors matches the impedance of the transmitter and the antenna. Impedance is the opposition to the flow of alternating current in an RF circuit, and it depends on the frequency, resistance, capacitance, and inductance of the components. A perfect impedance match would have a VSWR of 1:1, meaning that all the power is transferred from the transmitter to the antenna, and none is reflected back. However, in reality, there is always some degree of mismatch, which causes some power to be reflected back to the transmitter, creating standing waves along the cable. This reduces the efficiency and performance of the wireless system, and can also damage the transmitter. Excessive VSWR can be caused by using poor quality or damaged cables and connectors, or by using components that have different impedance ratings123. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 90; CWNA-108 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 86; CWNP website, CWNA Certification.

質問 # 55
You support a WLAN using dual- band 802.11ac three stream access points. All access points have both the 2.4 GHz and 5 GHz radios enabled and use 40 MHz channels in 2.4 GHz. A manager is concerned about the fact that each access point is connected using a 1 Gbps Ethernet link. He is concerned that the Ethernet link will not be able to handle the load from the wireless radios. What do you tell him?

A. His concern is valid and the company should immediately plan to run a second 1 Gbps Ethernet link to each AP.
B. His concern is valid and the company should upgrade all Ethernet link to 10 Gbps immediately.
C. His concern is invalid because the AP will compress all data before transmitting it onto the Ethernet link.
D. Due to 802.11 network operations and dynamic rates used by devices on the network, the two radios will likely not exceed the 1 Gbps Ethernet link .

正解：B

質問 # 56
An 802.11 WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 16 dBi of gain. What is the power level at the Intentional Radiator?

A. 250 mW
B. 500 mW
C. 25 mW
D. 1000 mW

正解：A

解説：
Explanation
The power level at the Intentional Radiator (IR) is 250 mW. The IR is the point where the RF signal leaves the transmitter and enters the antenna system. To calculate the power level at the IR, we need to consider the output power level of the transmitter, the loss of the cable, and the gain of the antenna. The formula is:
Power level at IR (dBm) = Output power level (dBm) - Cable loss (dB) + Antenna gain (dBi) We can convert the output power level of 50 mW to dBm by using the formula:
Power level (dBm) = 10 * log10(Power level (mW))
Therefore, 50 mW = 10 * log10(50) = 16.99 dBm
We can plug in the values into the formula:
Power level at IR (dBm) = 16.99 - 3 + 16 = 29.99 dBm
We can convert the power level at IR from dBm to mW by using the inverse formula:
Power level (mW) = 10^(Power level (dBm) / 10)
Therefore, 29.99 dBm = 10^(29.99 / 10) = 999.96 mW
However, since we need to round off the answer to the nearest integer value, we get:
Power level at IR (mW) = 1000 mW
References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 67; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page
57.

質問 # 57
A natural disaster has occurred in a remote area that is approximately 57 miles from the response team headquarters. The response team must implement a local wireless network using 802.11 WLAN access points.
What is the best method, of those listed, for implementation of a network back-haul for communications across the Internet in this scenario?

A. 802.11 bridging to the response team headquarters
B. Turn up the output power of the WLAN at the response team headquarters
C. Cellular/LTE/5G
D. Temporary wired DSL

正解：C

解説：
Explanation
Cellular/LTE/5G is the best method for implementing a network backhaul for communications across the Internet in a remote area that is affected by a natural disaster. This is because cellular/LTE/5G networks are wireless and do not depend on physical infrastructure that may be damaged or unavailable in such scenarios.
Cellular/LTE/5G networks also offer high-speed data transmission and wide coverage area, which are essential for emergency response operations. 802.11 bridging to the response team headquarters is not feasible because it requires line-of-sight and has limited range. Turning up the output power of the WLAN at the response team headquarters is not effective because it may cause interference and does not guarantee reliable connectivity. Temporary wired DSL is not practical because it requires installing cables and equipment that may not be available or accessible in a remote area. References: CWNA-109 Study Guide, Chapter 7: Wireless LAN Topologies, page 2031

質問 # 58
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 see the activity that is generating.
What common spectrum analyzer view should you use for this analysis?

A. Clients
B. APs
C. Waterfall/Spectrogram
D. Real-time FFT

正解：C

解説：
Explanation
The common spectrum analyzer view that you should use for this analysis is the Waterfall/Spectrogram view.
The Waterfall/Spectrogram view shows the signal from the interfering device over time on a three-dimensional graph. The x-axis represents frequency, the y-axis represents time, and the z-axis represents amplitude or power. The color of each pixel indicates the signal strength at a given frequency and time. The Waterfall/Spectrogram view can help you identify the characteristics of the interference source, such as its frequency range, duty cycle, modulation type, and pattern. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 524; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 494.

質問 # 59
The BSA of an AP covers the area used by the sales and marketing department. Thirty-five stations operate in this space. The user indicate that they need more throughput and all stations are 5 GHz capable 802.11ac clients. The current AP configuration uses 20 MHz channels in both
2.4 GHz and 5 GHz. What is the least expensive solution available for increasing throughput for these users without implementing configuration options that are not recommended?

A. Install a second AP in the coverage area
B. Use a 40 MHz channel on the 5 GHz radio
C. Use a 40 MHz channel on the 2.4 GHz radio.
D. Use a 160 MHz channel on the 5 GHz radio

正解：A

質問 # 60
A company has hired you to perform a pre-deployment site survey of their facility. During an interview, the network manager informs you that the new wireless network must use 5 GHz bands and OFDM, and VoWiFi handsets will be used extensively over the wireless network.
What items do you need to include in the RF site survey report? (Choose 2)

A. Security parameters and configuration steps for VoWiFi handsets.
B. Codec types and sampling rates for each VoWiFi phone
C. Results of OFDM versus ERP performance in each BSA
D. A heat map demonstrating signal quality in areas where VoWiFi is supported.
E. Test results from an active survey with a VoWiFi handset

正解：D、E

質問 # 61
What statement about the beamwidth of an RF antenna is true?

A. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
B. Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 dB.
C. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
D. Vertical beamwidth is displayed (in degrees) on the antenna's Azimuth chart.

正解：B

質問 # 62
What information is transmitted in the Beacon management frames of an HT access point to communicate about backward compatibility with ERP and HR/DSSS stations? (Choose 2)

A. RIFS mode
B. Secondary channel offset
C. Power save mode of clients
D. Non-ERP Present field
E. HT Protection mode

正解：B、E

質問 # 63
You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzers?

A. Retransmitted frames from multiple STAs at higher rates than other STAs
B. Frames transmitted from the AP without acknowledgement
C. Frames with the HN bit set to 1
D. Frames with the retry bit set to 0

正解：A

解説：
http://setup-wireless.blogspot.com/2008/11/wireless-hidden-node.html

質問 # 64
To ease user complexity, your company has implemented a single SSID for all employees. However, the network administrator needs a way to control the network resources that can be accessed by each employee based in their department.
What WLAN feature would allow the network administrator to accomplish this task?

A. WIPS
B. WPA2
C. RBAC
D. SNMP

正解：C

解説：
Explanation
The WLAN feature that would allow the network administrator to control the network resources that can be accessed by each employee based on their department is Role-Based Access Control (RBAC). RBAC is a method of assigning different permissions and policies to users or groups based on their roles in the organization. RBAC can be implemented by using VLANs, ACLs, or firewalls to restrict access to certain network segments or resources. RBAC can also be integrated with 802.1X/EAP authentication to dynamically assign roles and VLANs to users based on their credentials. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 403; [Role-Based Access Control (RBAC) in Wireless Networks], page 1.

質問 # 65
Which one of the following channels can be used for VHT transmissions according to the 802.11 specification?

A. 0
B. 1
C. 2
D. 3

正解：B

解説：
Explanation
The channel that can be used for VHT transmissions according to the 802.11 specification is channel 144.
VHT stands for Very High Throughput and is the PHY layer specification for 802.11ac devices. VHT transmissions can use channel bandwidths of 20 MHz, 40 MHz, 80 MHz, or 160 MHz in the 5 GHz band.
Channel 144 is one of the channels in the 5 GHz band that can support VHT transmissions with any of these bandwidths. Channel 6, channel 1, and channel 11 are channels in the 2.4 GHz band that cannot support VHT transmissions, as they are only compatible with legacy (802.11b/g/n), HT (802.11n), or ERP (802.11g) transmissions with up to 20 MHz bandwidth. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 214; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 204.

質問 # 66
A standard PoE injector is use to power an access point requiring 802.3at. CAT6 cabling is in use. What is the maximum distance supported between the access point and the Ethernet switch with the use of a midspan power injector?

A. 328 meters
B. 100 meters
C. 300 meters
D. 200 meters

正解：B

質問 # 67
The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz).
What is the center frequency of channel 4?

A. 2.422 GHz
B. 2.413 GHz
C. 2.427 GHz
D. 2.417 GHz

正解：C

質問 # 68
What security option for 802.11 networks supports SAE and requires protected management frames?
* WPA

A. OWE
B. WPA2
C. WPA3

正解：A

解説：
Explanation
The security option for 802.11 networks that supports SAE and requires protected management frames is WPA3. WPA3 stands for Wi-Fi Protected Access version 3 and is the latest security standard for WLANs.
WPA3 supports two modes: WPA3-Personal and WPA3-Enterprise. WPA3-Personal uses Simultaneous Authentication of Equals (SAE) as the key exchange protocol, which provides stronger protection against offline dictionary attacks and password guessing than WPA2-Personal. WPA3 also requires protected management frames, which are encrypted frames that prevent spoofing, replay, or denial-of-service attacks on management frames such as deauthentication or disassociation frames. WPA, WPA2, and OWE do not support SAE or require protected management frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 307; [CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106], page 297.

質問 # 69
What terms accurately complete the following sentence?
The IEEE 802.11-2016 standard specifies mandatory support of the _______________ cipher suite for Robust Security Network Associations, and optional use of the ________________ cipher suite, which is designed for use with pre-RSNA hardware and is deprecated.