無料で使えるCWNA-108試験ブレーン問題集認定ガイド問題と解答
CWNA-108認定概要最新のCWNA-108のPDF問題集
質問 # 68
The requirements for a WLAN you are installing state that it must support unidirectional delays of less than
150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?
- A. E-Mail
- B. FTP
- C. RTLS
- D. VoIP
正解：D
質問 # 69
Your manager asked you to locate a solution that allows for centralized monitoring of WLAN performance over time. He wants a single pane of glass for administration and monitoring of the solution. What do you recommend?
- A. Overlay WLAN monitoring solution
- B. AP-based spectrum analysis
- C. Laptop-based protocol analyzers
- D. Laptop-based spectrum analyzers
正解：A
質問 # 70
You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to
2.4 GHz APs, but it 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 clients are configured to use WPA and 5 GHz channels only support WPA2
- C. The antennas in the laptops have insufficient gain to detect the 5 GHz signals
- D. The client drivers are faulty and should be upgraded
正解：C
質問 # 71
The OSI model is a 7-layer model for understanding the functions of a communication system.
What OSI sublayers are specifically addressed by the IEEE 802.11-2012 standard? (Choose 2)
- A. PPDU
- B. Network
- C. MAC
- D. PLCP
- E. Transport
- F. IP
正解：C、D
質問 # 72
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous)
802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.1X Authenticator?
- A. All non-root bridges
- B. The root bridge
- C. The Ethernet switch
- D. The RADIUS server
正解：B
解説：
Explanation
The device in the bridge implementation that acts as the 802.1X Authenticator is the root bridge. The root bridge is the bridge that connects to the wired network and acts as the central point for all other bridges in the point-to-multipoint topology. The root bridge authenticates the non-root bridges using 802.1X/EAP and forwards their authentication requests to the RADIUS server. The non-root bridges act as the 802.1X Supplicants and use EAP methods such as EAP-TLS or EAP-PEAP to authenticate with the root bridge. References: [CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 459; [Cisco Aironet Wireless Bridges FAQ], question 29.
質問 # 73
What statement about 802.11 WLAN bridges is true?
- A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
- B. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
- C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
- D. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
正解：D
解説：
Explanation
WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally. A WLAN bridge is a device that connects two or more networks using the 802.11 protocol. A WLAN bridge must have a clear and strong signal between the two endpoints to ensure reliable and fast data transmission. The signal-to-noise ratio (SNR) is a measure of the quality of the signal, which depends on the distance, interference, obstacles, and antenna gain between the transceivers. A higher SNR means a better signal quality and a higher data rate. A lower SNR means a worse signal quality and a lower data rate. Therefore, a WLAN bridge must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally1.
質問 # 74
You are tasked with performing a throughput test on the WLAN. The manager asks that you use open source tools to reduce costs. What open source tool is designed to perform a throughput test?
- A. IxChariot
- B. PuTTy
- C. iPerf
- D. Python
正解：D
質問 # 75
What ID is typically mapped to an AP's MAC address if a single BSS is implemented?
- A. SSID
- B. Device ID
- C. BSSID
- D. VLAN ID
正解：C
質問 # 76
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. Wi-Fi scanner
- D. Access point spectrum analyzer
正解：C
質問 # 77
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. Vertical beamwidth is displayed (in degrees) on the antenna's Azimuth chart.
- C. Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by
3 dB. - D. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
正解：C
解説：
Explanation
The beamwidth of an RF antenna is the angular measure of how wide the main lobe of radiation is. The main lobe is the area where the signal strength is highest and most concentrated. The beamwidth is calculated at the points where the main lobe decreases power by 3 dB, which means it is half of the maximum power. The beamwidth can be measured in both horizontal and vertical planes, depending on how the antenna is oriented.
The horizontal beamwidth is also called azimuth, while the vertical beamwidth is also called elevation. The beamwidth patterns on an antenna polar chart indicate how the RF energy is distributed in different directions. References: 1, Chapter 2, page 66; 2, Section 2.3
質問 # 78
What term correctly completes the following sentence?
802.11a/b/g used a mandatory 800ns guard interval. 802.11n introduced an optional short 400ns guard interval. Guard intervals (GI) are necessary in OFDM to reduce the likelihood of interference between two consecutive ____________.
- A. Bytes
- B. Frames
- C. Symbols
- D. Segments
- E. Bits
- F. Packets
正解：C
質問 # 79
What 802.11 PHY uses available space in very low frequency ranges that is not in use at the time by broadcast video signals?
- A. DSSS
- B. DMG
- C. SIG
- D. TVHT
正解：A
解説：
https://www.cwnp.com/802-11ac-vht-just-the-facts/
質問 # 80
A WLAN transmitter that emits a 50 mW signal is connected to a cable with 3 dB loss. If the cable is connected to an antenna with 9dBi gain, what is the EIRP at the antenna element?
- A. 13 dBm
- B. 10 dBm
- C. 26 dBm
- D. 23 dBm
正解：D
解説：
Explanation
To calculate the EIRP at the antenna element, we need to add the transmitter output power, subtract the cable loss, and add the antenna gain. All these values need to be converted to dBm first, if they are not already given in that unit. In this case, we have:
Transmitter output power = 50 mW = 10 log (50) dBm = 16.99 dBm Cable loss = 3 dB Antenna gain = 9 dBi EIRP = Transmitter output power - Cable loss + Antenna gain EIRP = 16.99 - 3 + 9 EIRP = 22.99 dBm Rounding up to the nearest integer, we get 23 dBm as the EIRP at the antenna element12. References: CWNA-109 Study Guide, Chapter 2: Radio Frequency Fundamentals, page
92; CWNA-108 Study Guide, Chapter 2: Radio Frequency Fundamentals, page 88.
質問 # 81
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. IP datagram
- B. MAC Protocol Data Unit (MPDU)
- C. MAC Service Data Unit (MSDU)
- D. PLCP Service Data Unit (PSDU)
- E. PLCP Protocol Data Unit (PPDU)
正解：C
質問 # 82
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. Transmit power
- C. MU-MIMO capabilities of the bridges
- D. Receive antenna gain
正解：C
解説：
Explanation
MU-MIMO capabilities of the bridges are not a factor considered when calculating the Link Budget for an outdoor point-to-point WLAN bridge link. The Link Budget is a calculation of the expected signal strength at the receiver based on various factors that affect the RF transmission. Some of these factors are operating frequency, transmit power, receive antenna gain, free space path loss, cable loss, connector loss, and environmental loss. MU-MIMO stands for Multi-User Multiple Input Multiple Output, which is a technology that allows multiple devices to communicate simultaneously using multiple spatial streams. MU-MIMO is not relevant for a point-to-point link, where there are only two devices involved. References: 1, Chapter 2, page
59; 2, Section 2.2
質問 # 83
You are troubleshooting an issue reported by several wireless user. The problem is contained to one cell (several users connected to the same AP. You manage the WLAN and no other network devices. After analysis it appear to be a switch problem. What action should be taken?
- A. Create a plan of action and implement it
- B. Document the results and close the case
- C. Escalate the problems to the network administration Learn
- D. Escalate the problem to the wireless vendor support staff
正解：C
質問 # 84
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