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NEW QUESTION 117
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 118
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 119
Among the following options, the common source of WLAN interference is (Select 3 Answers).
- A. Microwave oven
- B. Cordless telephone
- C. Remote control
- D. Bluetooth transmission equipment
Answer: A,B,D
NEW QUESTION 120
MIMO (Multiple input and multiple output), that is, multiple input and multiple output, wireless access points and clients using 802.11n technology can simultaneously transmit data using up to three spatial streams, and the theoretical rate can reach 600 Mbps.
- A. False
- B. True
Answer: A
NEW QUESTION 121
Metal objects have a greater attenuation of the wireless signal, and the AP or antenna should be placed behind a metal ceiling or the like.
- A. False
- B. True
Answer: B
NEW QUESTION 122
The electrical performance indicators of the antenna include (Select 3 Answers).
- A. Gain
- B. Polarization mode
- C. Lobe width
- D. Power size
Answer: A,B,C
NEW QUESTION 123
What is the China WLAN security mandatory standard?
- A. WLAN
- B. WiMax
- C. WiFi
- D. WAPI
Answer: D
NEW QUESTION 124
Each AC device needs to specify the source IP address of the AC to establish a CAPWAP tunnel with the AP.
One AC can specify up to two WLAN source IP addresses.
- A. False
- B. True
Answer: A
NEW QUESTION 125
In the 802.11 frame, what is the value of To DS and From DS respectively when the wireless station sends a signal to the wireless AP?
- A. 0 , 1
- B. 0 , 0
- C. 1 , 1
- D. 1 , 0
Answer: D
NEW QUESTION 126
Which of the following standards organizations is proposed by the CAPWAP protocol?
- A. ETSI
- B. IETF
- C. FCC
- D. CCC
Answer: B
NEW QUESTION 127
In the WDS point-to-point network, the backbone link between the Root AP and the Leaf AP is connected in the 5 GHz band. The channel used by the Root AP is 149. Which of the following channels should the Leaf AP use?
- A. 0
- B. 1
- C. all of the above except for 149
- D. 2
Answer: B
NEW QUESTION 128
How many subcarriers can 802.11a use to transmit data in 20M mode?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 129
Unlike the 802.11a/b/g standard, the 802.11n protocol is a dual-band mode of operation (supporting two operating bands of 2.4 GHz and 5 GHz).
- A. False
- B. True
Answer: B
NEW QUESTION 130
The two commonly used units describing antenna gain are dBi and dBd, and the conversion relationship between them is: dBi=dBd+2.14.
- A. False
- B. True
Answer: B
NEW QUESTION 131
In TKIP encryption, which bit is the length of IV vector?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 132
When the channel interference of the 2.4 GHz band is large and severe, the device is adjusted to 3 channels, which can effectively reduce interference.
- A. False
- B. True
Answer: A
NEW QUESTION 133
Which of the following is a wireless LAN standard originally developed by the IEEE?
- A. IEEE 802.11
- B. IEEE 802.10
- C. IEEE 802.12
- D. IEEE 802.16
Answer: A
NEW QUESTION 134
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 135
An infrastructure-mode network consisting of multiple APs and distributed systems that connect them, also known as what?
- A. Basic service set
- B. Extended service area
- C. Extended service set
- D. Basic service area
Answer: C
NEW QUESTION 136
When only one interface of the AC is connected to the aggregation layer switch, the user traffic is directly transmitted through the aggregation switch to the public network.
- A. Side-by-side mode + direct forwarding
- B. Side-by-side mode + tunnel forwarding
- C. Direct connection mode + tunnel forwarding
- D. Direct connection mode + direct forwarding
Answer: A
NEW QUESTION 137
Which of the following AP modes does not belong to WDS network?
- A. Bridge AP
- B. Root AP
- C. Leaf AP
- D. Middle AP
Answer: A
NEW QUESTION 138
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