[2022年08月] ベストH3CSE WLAN Certification学習ガイドはGB0-342-ENU試験問題集
GB0-342-ENU認定ガイド問題と解答トレーニング
質問 102
Should a WLAN indoor distributed system use a fat AP or a thin AP?
- A. You can be fat or thin
- B. Fat AP
- C. Thin AP
正解: A,B,C
質問 103
In order to increase the universal type, the FIT AP version of wireless products will no longer be released separately, but will be included in the package file of the corresponding controller version, such a description is true.
- A. correct
- B. error
正解: A
質問 104
Which of the following wireless WLAN PHY layer protocols can only work in the 2.4G frequency band.
- A. 802.11ax
- B. 802.11b
- C. 802.11g
- D. 802.11n
正解: B,C
質問 105
Thicker cables generally have a higher cost, but the loss introduced by them is small, the bending radius is small, and the construction is convenient.
Is the above statement correct?
- A. error
- B. correct
正解: A
質問 106
The "WPA--Personal"" or WPA 2--Personal" network authentication method uses ____ to prevent unauthorized network access, typically by entering a text phrase with 8 to 63 characters.
- A. PSK
- B. PEAP
- C. WEP
- D. EAP-TLS
正解: A
質問 107
The description about hidden nodes is correct
- A. cts-to-self is to solve the hidden node problem
- B. In the outdoor AP+CPE environment, to reduce the impact of hidden nodes, the RTS/CTS function can be enabled on the AP side
- C. The formation of hidden nodes between APs may result in collision and loss of packets sent by APs to STAs
- D. In order to reduce the impact of hidden nodes in the indoor environment, the RTS/CTS function can be enabled on the AP side
正解: C
質問 108
The 802.11 protocol that defines QoS in WLAN is ____
- A. 802.11f
- B. 802.11e
- C. 802.11
- D. 802.11i
正解: B
質問 109
In order to reduce the influence of the surrounding environment and ensure the stability of the wireless bridging device, the _____ frequency band is usually used to establish a bridging application; at the same time, the working channels of the two bridging devices are
- A. 5.8Ghz , must be the same
- B. 2.4Ghz , must be the same
- C. 2.4Ghz, can be different
- D. 5.8Ghz , can be different
正解: A
質問 110
According to the working principle of the wireless air interface competition mechanism (CSMA/CA), it is recommended that the number of nodes participating in the competition should not exceed _____, because when the contention points reach ______, the air interface conflict will increase sharply. To ensure the effective bandwidth of users, it is recommended that the number of concurrent users under each AP does not exceed ______.
- A. 64; 64; 48
- B. 20; 20; 15
- C. 50; 50; 40
- D. 40; 40; 30
正解: B
質問 111
Which of the following statements about antenna gain is correct?
- A. The higher the gain of the antenna, the higher the degree of signal convergence
- B. The selection of the antenna should meet the requirements of the coverage scenario, not the bigger the gain, the better
- C. The higher the gain of the antenna, the better, using the antenna with large gain can obtain greater transmit power
- D. The larger the antenna gain, the smaller the coverage angle
正解: A,B,D
質問 112
It is true that the sequence of PSK certification, 802.1X certification and antenna 802.11 step-by-step competition is correct.
- A. 802.1X authentication occurs during the authentication process, and the association process starts after the authentication is completed. The question bank is required for the association process.
- B. PSK authentication occurs during the authentication process, and the association process starts after the authentication is completed
- C. PSK authentication occurs after the association is completed, and the authentication and encryption information exchange with the AP is completed through eapol
- D. 802.1X authentication occurs after the association is completed, and the authentication and encryption trust interaction with the AP is completed through eapol
正解: C,D
質問 113
Which parts of the Wlan project are not installed properly, which may affect the strength and quality of wireless signal coverage
- A. power supply
- B. Cables (network cables, feeders, power cables)
- C. Antenna
- D. AP
正解: A,B,C,D
質問 114
Among the following descriptions about H3C FIT AP registration, which statement is correct?
- A. The FIT AP software that matches its version should exist in the flash of the AC, and make sure the name is correct
- B. During the Fit AP registration process, you must ensure that the AP number added on the AC is the same as the actual device
- C. During the registration process, the Fit AP displays image load , which means that the Fit AP is downloading software from the AC.
- D. After the FIT AP is successfully registered on the AC, the displayed status is Run, if the registration is unsuccessful, the displayed status is Idle
正解: A,B,C,D
質問 115
Outdoor wireless bridge survey data mainly includes:
- A. Length of network cable and feeder
- B. Distance between two points, number of equipment models
- C. Required engineering accessories (reporting poles and kits, grounding wires, power wires, bushings, etc.)
- D. Installation method
正解: A,B,C,D
質問 116
In the survey of outdoor bridge, the main consideration is the problem of wireless line of sight. The opposite end's antenna should be visible on the site, and there should be no obstacles in the middle. In general, solving the line-of-sight problem and the I Fresnel interval problem can be done by the following methods.
Which is the most simple and effective way?
- A. Raise the height of the antenna
- B. Choose a good repeater.
- C. Clear obstacles in the Fresnel area, such as cutting down trees.
- D. Choose a high-performance antenna, which can solve the "partially invisible" problem.
正解: A
質問 117
The best way to determine how far a signal travels between wireless devices is.
- A. Use the path loss calculation formula
- B. Visual distance
- C. Conduct a thorough site survey
- D. Estimating RF Signals Using Intense Linear Light Sources
正解: C
質問 118
The following statement is correct
- A. WLAN dual-band combiner is used for capacity expansion, which is fast in implementation and low in cost. It can quickly double the number of access users in hotspot areas, and can easily deploy functions such as load balancing.
- B. WLAN and PHS have similar frequency bands and air attenuation. When the power of the equipment is the same, the coverage is similar, which provides favorable conditions for the co-site construction of WLAN and PHS.
- C. The user isolation function can reduce the impact of broadcast packets and user traffic on the network, and also avoid some ARP attacks, making the wireless network stable and safe to use.
- D. When covering multiple floors, the channel setting should consider the signal interference in the three-dimensional space.
正解: A,B,C,D
質問 119
In the wireless network survey and design, when covering floors and areas with business requirements, the received signal strength of more than 95% of the target coverage area should be greater than or equal to _____ (experience value, applicable to most wireless network cards) Key coverage Regional signal strength should be greater than or equal to ____
- A. -80dBm; -75dBm
- B. -90dBm; -85dBm
- C. -75dBm; -70dBm
- D. -85dBm : -80dBm
正解: C
質問 120
Which of the following modulation techniques does 802.11b use to achieve a transmission rate of 11Mbps?
- A. OFDM
- B. QPSK
- C. CCK
- D. BPSK
正解: C
質問 121
When the wireless bridge (WDS) fails, the first thing to do is to check the engineering installation specifications. The correct description below is
- A. Check whether the working frequency of the currently used antenna matches the working frequency of the Radio (11a/11g).
- B. Check whether the polarization direction of the antenna is consistent, which can be judged by the V-shaped mark.
- C. Check whether the connection between the various RF connection parts is tight.
- D. Check that the antennas at both ends of the bridge are aligned.
正解: A,B,C,D
質問 122
Air interface channel utilization* is an important indicator for judging the current channel busyness of the AP. By checking the air interface channel utilization rate of the AP, the current occupancy of this channel can be judged.
The following description about how to check the air interface channel utilization" is correct ()
- A. In hidden command mode, use the command *display ar5d radio-num channel busy to query the air interface channel utilization+
- B. By default, the system checks the channel utilization every 9 seconds
- C. When viewing the value through the command, the system will count the last 20 channel utilization values
- D. When the working channel of the AP is switched, the system will clear the statistics record value
正解: A,B,C,D
質問 123
Because WDS is not clearly specified in the 802.11 protocol, AP equipment of various manufacturers is _____ WDS intercommunication
- A. Yes
- B. No
正解: B
質問 124
When using a WLAN dual-band combiner for indoor distributed system combining and expansion, the following statements are correct:
- A. The WLAN combination expansion scheme can increase the capacity of the entire WLAN system by using different channel combination of two APs.
- B. During the project implementation, if using Fit AP for WLAN dual-band combination, it is recommended to enable the load sharing function of wireless controller + Fit AP, which can enable wireless users to connect to two APs evenly and avoid users on one AP. Many, while few users on another AP happen.
- C. At present, due to the limitation of device characteristics, this expansion scheme only supports the expansion of channel 1 and channel 11. However, which of the two ports of the combiner is connected to the AP of channel 1 and which is connected to the AP of channel 11 is not strictly required. limit.
- D. When using this combination expansion scheme, the insertion loss introduced by the WLAN combiner is about 2dB, which needs to be taken into account when calculating the signal strength.
正解: A,B,D
質問 125
In the 802.11b/g protocol, there are a total of 13 channels (1--13) open in China. Please select 3 channels that do not interfere with each other from these 13 channels. Which of the following groups is correct?
- A. 2 , 7 , 12
- B. 1 , 5 , 9
- C. 1 , 2 , 3
- D. 1 , 6 , 11
正解: A,D
質問 126
Which of the following frequencies can 802.11n operate at?
- A. 1.8GHz
- B. 2.4GHz
- C. 5GHz
- D. 3.5GHz
正解: B,C
質問 127
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ベストH3C GB0-342-ENU学習ガイドと問題集は2022年に更新されました：https://www.goshiken.com/H3C/GB0-342-ENU-mondaishu.html