Accurate H12-311 Class 2021

NEW QUESTION 1
The gain of antenna A is 11dBi, and the gain of antenna B is 8dBi. It can be said that antenna A has a larger gain than antenna B.

• A. 3dB
• B. 3dBi
• C. 3dBd
• D. Uncertain

Answer: A

NEW QUESTION 2
The AC6605 of the Huawei box-type wireless controller supports 24 PoE interfaces. When the WLAN is connected to the network, it can directly supply power to the AP connected to the AC.

• A. True
• B. False

Answer: B

NEW QUESTION 3
The eSight network management system is Huawei's dedicated network management platform, but it can only manage Huawei's own devices.

• A. True
• B. False

Answer: B

NEW QUESTION 4
What is the working frequency band used in the original 802.11 protocol?

• A. 2.4 GHz
• B. 900 MHz
• C. 2.0 GHz
• D. 5 GHz

Answer: A

NEW QUESTION 5
For lobe width, the following description is correct (Select 3 Answers).

• A. In the main lobe range, the power density decreases by half (3dB) relative to the maximum radiation direction.
• B. The narrower the lobes, the better the directionality, the farther the radiation distance, the stronger the anti-interference ability
• C. The pattern usually has two or more petals
• D. The terminal can receive the signal only within the half power angle coverage.

Answer: ABC

NEW QUESTION 6
To configure a WLAN service, you need to add an AC to the U2000.

• A. True
• B. False

Answer: A

NEW QUESTION 7
Which country or region is ETSI a standard organization?

• A. China
• B. USA
• C. Japan
• D. Europe

Answer: B

NEW QUESTION 8
What are the following WLAN standards for transmission rates up to 54 Mbps and above (Select 3 Answers)?

• A. 802.11a
• B. 802.11b
• C. 802.11g
• D. 802.11n

Answer: ACD

NEW QUESTION 9
The architecture of the WLAN is mainly divided into a controller-based thin AP architecture and a
traditional independent fat AP architecture.

• A. True
• B. False

Answer: A

NEW QUESTION 10
What type of frame does the ACK frame belong to in the WLAN?

• A. Management frame
• B. Control frame
• C. Data frame
• D. Empty data frame

Answer: B

NEW QUESTION 11
The AP and the antenna can be connected.

• A. Network cable
• B. CATV coaxial cable
• C. Power cable
• D. 50 ohm RF coaxial cable

Answer: D

NEW QUESTION 12
What is the coverage of the AP (Select 3 Answers).

• A. AP transmit power
• B. Antenna gain
• C. AP size
• D. Transmission loss

Answer: AB.D

NEW QUESTION 13
Among the following options, it is not the main purpose of roaming.

• A. Avoid excessive authentication time during roaming, resulting in packet loss or even service interruption.
• B. Ensure user authorization information remains unchanged.
• C. Ensure that the user's IP address is unchanged.
• D. Ensure that the user's network rate is unchange

Answer: D

NEW QUESTION 14
The antenna obtains the gain by means of .

• A. Using a power amplifier in the antenna system
• B. Making the antenna radiation more concentrated
• C. Use high efficiency antenna feeder
• D. Use low standing wave ratio equipment

Answer: B

NEW QUESTION 15
In the 802.11 frame, what type of frame does the STA's association request and authentication request belong to?

• A. Data frame
• B. Control frame
• C. Management frame
• D. Data frame, control frame, management frame have this function

Answer: C

NEW QUESTION 16
What is correct in the following options (Select 3 Answers)?

• A. SSID technology can divide a wireless local area network into several sub-networks that require different authenticatio
• B. Each sub-network needs independent authenticatio
• C. Only authenticated users can enter the corresponding sub-network to prevent unauthorized acces
• D. The user enters the network.
• E. The BSSID is actually the MAC address of the AP, which is used to identify the BSS managed by the AP, and maps the BSSID and SSID in the same AP.
• F. Users can implement roaming under different SSIDs.
• G. The SSID is the same in an ESS, but the BSSID corresponding to each AP in the ESS is differen
• H. If an AP can support multiple SSIDs at the same time, the AP will assign different BSSIDs to correspond to these SSIDs.

Answer: ABD

NEW QUESTION 17
Which of the following are factors that need to be considered for AP capacity planning (Select 3 Answers)

• A. Equipment performance
• B. Number of concurrent users
• C. Bandwidth requirements
• D. Power supply type

Answer: ABD

NEW QUESTION 18
For outdoor WLAN coverage, the following statement is correct (Select 3 Answers).

• A. The higher the antenna gain, the stronger the antenna directivity and the weaker the radiation gain directly below the antenna.
• B. The feeder interface must match the selected antenna
• C. The length of the feeder must not exceed 2 meters.
• D. Outdoor antennas should not blindly pursue high gain

Answer: ABD

NEW QUESTION 19
Which of the following options is the maximum rate supported by the 802.11g protocol?

• A. 11Mbps
• B. 22Mbps
• C. 54Mbps
• D. 108Mbps

Answer: C

NEW QUESTION 20
The following service models can provide end-to-end QoS services, but the scalability is not good.

• A. Best Effort model
• B. IntServ model
• C. FIFO model
• D. DiffServ model

Answer: B

NEW QUESTION 21
The following description of the splitter and coupler is correct .

• A. Power splitter and coupler are equal power allocation
• B. Power splitter is equal power distribution, coupler is unequal power distribution
• C. Power splitter is unequal power distribution, coupler is equal power distribution
• D. Power splitter and coupler are unequal power distribution

Answer: B

NEW QUESTION 22
AAA is a management framework that is implemented using more common protocols.

• A. RADIUS
• B. CAPWAP
• C. 802.11a/b/g/n
• D. 802.1X

Answer: A

NEW QUESTION 23
In order to ensure that there is no interference between the channels of the WLAN network, which of the following bands belong to the Chinese 5.8GHz band (Select 2 Answers)?

• A. 149
• B. 151
• C. 153
• D. 155

Answer: AC

NEW QUESTION 24
The indicator used to describe the extent to which the antenna converges on the transmit power is.

• A. Broadband
• B. Power
• C. Gain
• D. Polarity

Answer: C

NEW QUESTION 25
The cable used in the project cannot theoretically exceed the meter.

• A. 50
• B. 80
• C. 100
• D. 150

Answer: B

NEW QUESTION 26
Which of the following options are part of the 802.11b/g protocol (Select 3 Answers)?

• A. Different throughput capabilities
• B. Different protocols use different technologies
• C. Different data rates supported
• D. Different working bands

Answer: ABC

NEW QUESTION 27
802.11b supports () channels in the United States, where one channel does not overlap?

• A. 14;3
• B. 11;3
• C. 11;6
• D. 14; 6

Answer: B

NEW QUESTION 28
WLAN APs can be powered by (Select 3 Answers).

• A. POE switch
• B. POE adapter
• C. Independent power adapter
• D. RF cable

Answer: ABC

NEW QUESTION 29
Which of the following wireless frames belong to the Control Frame (Select 3 Answers)?

• A. Beacon
• B. RTS
• C. CTS
• D. PS-Poll

Answer: ACD

NEW QUESTION 30
How to deal with the failure of AP and AC version mismatch on a large number of devices.

• A. Upgrade the versions to match each other.
• B. Replace the AP device.
• C. Replace the switch
• D. Check if the POE power supply is norma

Answer: A

NEW QUESTION 31
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