Most Up-to-date H12-311 Courses 2021

NEW QUESTION 1
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 2
The Barker code is an 11-bit sequence (for example, 10110111000), which has advantages in wireless transmission, which can effectively reduce interference, but reduces efficiency.

• A. True
• B. False

Answer: A

NEW QUESTION 3
When a data frame is sent and acknowledged, what is the time interval to wait before the next data frame is sent ()?

• A. SIFS
• B. IFS
• C. DIFS
• D. PIFS

Answer: C

NEW QUESTION 4
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: ABD

NEW QUESTION 5
Which of the following ports can only belong to one VLAN.

• A. access
• B. hybrid
• C. trunk
• D. eth-trunk

Answer: A

NEW QUESTION 6
Regarding the two major standards of PoE, the following statement is incorrect (Select 2 Answers). The

• A. 802.af standard was established in 2009, and the maximum output power is 30W.
• B. 802.at supports four power levels and only supports Category 5 lines.
• C. 802.af, also known as PoE+, is compatible with 802.at devices.
• D. 802.at, also known as PoE+, is compatible with 802.af device

Answer: AC

NEW QUESTION 7
When deploying APs on multiple floors of a building, the factor to be aware of is (Select 3 Answers).

• A. Material of the wall
• B. Other interference signals
• C. In order not to affect the appearance, the AP should be hidden in the ceiling
• D. Unified planning channel

Answer: ABD

NEW QUESTION 8
What VLAN is used to establish a CAPWAP tunnel VLAN for the AP and AC?

• A. Management VLAN
• B. Service VLAN
• C. User VLAN
• D. Authentication VLAN

Answer: A

NEW QUESTION 9
When the two-channel center frequency distance is less than or equal to 25 MHz, there is an overlapping area between the channels, and there may be some interference. Therefore, in order to avoid adjacent channel interference in adjacent area channel planning, the same channel is not allowed.

• A. True
• B. False

Answer: B

NEW QUESTION 10
In the WDS deployment, which types of bridge networking modes are included (Select 3 Answers)?

• A. Point-to-point mode
• B. Point-to-multipoint mode
• C. Relay bridge mode
• D. Multi-point to multi-point mode

Answer: ABC

NEW QUESTION 11
The CAPWAP protocol is a WLAN standard proposed by the IEEE standards organization in April 2009 for communication between AC and thin APs.

• A. True
• B. False

Answer: B

NEW QUESTION 12
What is the command for the Huawei AC6605 to switch between the wired side and the wireless side?

• A. Ctrl+B
• B. Ctrl+X
• C. Ctrl+Y
• D. Ctrl+Z

Answer: B

NEW QUESTION 13
In an 802.11 frame, the terminal needs to obtain access rights to the wireless medium, and what kind of control message is to be sent?

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

Answer: A

NEW QUESTION 14
The choice of WLAN coverage antenna, for narrow and long areas, it is recommended to select (), open a short distance area, it is recommended to select ().

• A. omnidirectional antenna; omnidirectional antenna
• B. omnidirectional antenna; directional antenna
• C. directional antenna; omnidirectional antenna
• D. directional antenna; directional antenna

Answer: C

NEW QUESTION 15
Among the following obstacles, has the greatest loss of wireless signals.

• A. Gypsum ceiling
• B. Glass
• C. 120mm Brick wall
• D. 200mm Concrete wall

Answer: D

NEW QUESTION 16
Various pipes, metal keels and aluminum alloy gussets in the ceiling will have a greater impact on the actual signal coverage.

• A. True
• B. False

Answer: A

NEW QUESTION 17
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 18
In the TKIP encryption mode, the length of the IV vector is bit.

• A. 12
• B. 24
• C. 48
• D. 64

Answer: C

NEW QUESTION 19
To create a user for Huawei's AC, first use the aaa command to enter the view.

• A. True
• B. False

Answer: A

NEW QUESTION 20
The CAPWAP protocol supports both Split Mac and Local Mac modes of operation.

• A. True
• B. False

Answer: A

NEW QUESTION 21
The conditions for switching triggers are generally set (Select 2 Answers).

• A. Start the switch after the STA reaches a certain distance from the original AP.
• B. Set the signal strength ratio between the current AP and the neighbor AP, and switch to the threshold.
• C. Check the packet loss rate and start switching when the packet loss rate reaches a certain value.
• D. Start the switch when the network speed is very slow when it is associated with the original A

Answer: BC

NEW QUESTION 22
According to the following output, the following statement is correct (Select 3 Answers).
<Quidway> display version
Huawei Versatile Routing Platform Software
VRP (R) software, Version 5.70 (AC6605 V200R001C00) Copyright (C) 2003-2012 Huawei TECH CO., LTD
Quidway AC6605-PWR Routing Switch uptime is 0 week, 1 day, 23 hours, 33 minutes H852V26S 0(Master) : uptime is 0 week, 1 day, 23 hours, 33 minutes
512M bytes DDR Memory 128M bytes FLASH
Check the running status of the AC6605.

• A. display version can see that the VRP version number of today's devices is 5.70.
• B. The equipment has been running continuously for 1 day, 23 hours and 33 minutes.
• C. Currently the device has used 512 Mbytes of system memory.
• D. The total flash size of the device is 128 Mbyte

Answer: ABD

NEW QUESTION 23
What is the function of the AC in the wireless network (Select 3 Answers)?

• A. Centralized management AP
• B. Implement roaming function
• C. Send beacon frame
• D. Wireless intrusion detection

Answer: ABD

NEW QUESTION 24
Which of the following is included in the 802.11n MAC layer improvement technology (Select 2 Answers)?

• A. Frame aggregation technology
• B. MIMO technology
• C. Block confirmation technology
• D. Beamforming technology

Answer: AC

NEW QUESTION 25
If the demand for WLAN capacity is high in a coverage area, the construction method of should be considered.

• A. Indoor distribution system combination road
• B. Outdoor distribution system combination road
• C. Indoor installation
• D. Outdoor type AP+ directional antenna

Answer: C

NEW QUESTION 26
Which of the following AP modes does not belong to the WDS network?

• A. Root AP
• B. Middle AP
• C. Bridge AP
• D. Leaf AP

Answer: C

NEW QUESTION 27
For a wireless network with WPA2 PSK authentication and SSID broadcast, the user can double-click on the SSID and enter the correct username and password to access the network.

• A. True
• B. False

Answer: B

NEW QUESTION 28
CCMP encryption is more secure than TKIP encryption because of its security.

• A. Adopt a longer IV
• B. Added a key distribution mechanism, no longer using a single key
• C. Adopting a more complex encryption algorithm
• D. Added a message integrity check mechanism

Answer: C

NEW QUESTION 29
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