Latest [Dec 01, 2021] Huawei H12-311 Real Exam Dumps PDF
H12-311 Practice Test Questions Updated 261 Questions
NEW QUESTION 19
With which of the following ways does the antenna get the gain?
- A. Using high efficiency antenna feeders
- B. Equipment using low standing wave ratio
- C. Make the antenna radiation more concentrated
- D. Using a power amplifier in an antenna system
Answer: C
NEW QUESTION 20
802.11 has three frame types, what are they? (Multiple choice)
- A. Business frame
- B. Management frame
- C. Data frame
- D. Control frame
Answer: B,C,D
NEW QUESTION 21
If the AP wants to obtain the IP address of the AC through the DNS server, first obtain the IP address of its own IP address, DHCP server, and DNS.
- A. False
- B. True
Answer: B
NEW QUESTION 22
How much bandwidth is each 802.11g frequency band channel?
- A. 22 MHz
- B. 25 MHz
- C. 20 MHz
- D. 50 MHz
Answer: C
NEW QUESTION 23
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. False
- B. True
Answer: A
NEW QUESTION 24
Which of the following ports can only belong to one VLAN.
- A. eth-trunk
- B. access
- C. trunk
- D. hybrid
Answer: B
NEW QUESTION 25
How many channels can the 2.4 GHz band be divided into?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 26
Which of the following options is not the main purpose of roaming?
- A. avoid roaming in the process of certification time is too long lead to packet loss and even business interruption
- B. ensure that the user authorization information remains the same
- C. ensure that the user's network rate unchanged
- D. ensure that the user IP address remains the same
Answer: C
NEW QUESTION 27
What are the general methods for solving co-channel interference (ABD) (Select 3 Answers).
- A. Natural isolation using obstacles
- B. Multi-directional coverage using omnidirectional antennas
- C. Reasonable frequency reuse to ensure that the same channel does not appear in the same or adjacent coverage area
- D. Adjust AP transmit power and adjust antenna feed
Answer: A,C,D
NEW QUESTION 28
For dBm, dB, dBi, which of the following descriptions are correct? (Multiple Choice)
- A. dBm: characterizing the absolute value of power
- B. dBi and dBd: characterizing the relative value of the gain
- C. dB: characterizing the relative value of power
- D. If A antenna is 12dBi and B antenna is 14dBi, it can be said that A is 2dBi smaller than B.
Answer: A,B,C
NEW QUESTION 29
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. PS-Poll
- D. ACK
Answer: A
NEW QUESTION 30
When WLAN planning is performed in a single area, the factors affecting the number of APs deployed are (Select 3 Answers).
- A. Size of the area
- B. Number of network ports
- C. Number of people accessing in the area
- D. Field strength and bandwidth requirements
Answer: A,C,D
NEW QUESTION 31
Which of the following description about Fit AP is correct?
- A. Fit AP cannot be used alone and must be used with the wireless controller
- B. Fit AP is also known as a wireless router.
- C. Fit AP is gradually being replaced by fat AP due to its long absence.
- D. Fit AP can implement 802.1X authentication, encryption and other functions. Others such as QoS and roaming functions are implemented on the wireless controller.
Answer: A
NEW QUESTION 32
The Int-Serv model provides users with end-to-end absolute QoS guarantees, but the reason for the lack of successful large-scale commercial use is.
- A. Limited bandwidth reservation
- B. Low forwarding efficiency
- C. Not conducive to traffic regulation
- D. Poor scalability
Answer: D
NEW QUESTION 33
What are the main contents of the CAPWAP protocol? (Multiple choice)
- A. AC manages the AP and delivers the service configuration.
- B. AP automatic discovery of AC and state machine operation and maintenance of AP&AC
- C. Define the transmission rate of the MAC layer and the physical layer
- D. STA data encapsulates the CAPWAP tunnel for forwarding
Answer: A,B,D
NEW QUESTION 34
The gain of the antenna A is 11 dBi, and the gain of the antenna B is 8 dBi, it can be said that, how much is the gain of the antenna A larger than that of the antenna B?
- A. 3 dBd
- B. 3 dBi
- C. 3 dB
- D. Uncertain
Answer: C
NEW QUESTION 35
What is the 2.4 GHz frequency band non-overlapping channels?
- A. 2,7,12
- B. 1,6,11
- C. 3,7,13
- D. 3,8,13
Answer: B
NEW QUESTION 36
Basic service set is the basic component of 802.11 network, consists of a set of workstations communicate with each other.
- A. False
- B. True
Answer: B
NEW QUESTION 37
In the 802.11 frame, what is the correct correspondence between the Type and the frame format in the Frame Control bit?
- A. Type is 10, indicating the control frame. When
- B. Type is 00, it means management frame.
- C. Type is 01, indicating that the data frame
- D. Type is 00, it means reserved. When
Answer: B
NEW QUESTION 38
What is the command to check online users on the AC?
- A. display user-interface console 0
- B. display local-user
- C. display access-user
- D. display users all
Answer: C
NEW QUESTION 39
The architecture of the WLAN is mainly divided into a controller-based thin AP architecture and a traditional independent fat AP architecture.
- A. False
- B. True
Answer: B
NEW QUESTION 40
If the forwarding mode of an enterprise wireless network is direct forwarding, the Fit AP can convert the 802.11 data packet into an Ethernet packet, and then encapsulate the packet into a CAPWAP encapsulation and transmit the data packet to the AC through the CAPWAP tunnel.
- A. False
- B. True
Answer: A
NEW QUESTION 41
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