NO.15 Which is the longest interval between 802.11 frames ()?

NO.16 The omnidirectional antenna appears on the horizontal pattern as ()Spend.

NO.17 When coverage area 2.4GHz Frequency band 1 When channel interference is large and severe, adjust the device to 3 Channel, can effectively reduce interference.

NO.18 Perform connectivity test AP or AC Must be online.

NO.19 antenna A The gain is 11dBi ,antenna B The gain is 8dBi , You can say the antenna A Than antenna B The gain is large ().

NO.20 What are the general methods to solve co-channel interference (). (Select 3 Answers)

NO.21 The gain of the antenna can be explained ().

NO.22 User number 300 People, concurrency rate 70% , Terminal support 2.4GHz and 5GHz Frequency band, in accordance with each AP Maximum number of dual-band access users40 people Consider, need at least () AP Able to meet capacity requirements?

NO.23 CCMP The algorithm used for encryption is ().

NO.24 802.11 Frame, when the network uses WDS When the model is signaled, To DS and From DS What are the values of ()?

NO.25 Antennas are classified according to directivity and can be divided into () antennas and () antennas.
(Select 2 Answers)

NO.26 For indoor distributed APs, which of the following descriptions is correct is ().

NO.27 802.11b Which channels in the protocol do not overlap each other()? (Select 3 Answers)

NO.28 according to AP and AC The inter-network architecture can divide the networking mode into two-tier networking and three-tier networking.

NO.29 Which of the following protocols support 2.4GHz Frequency band()? (Select 3 Answers)

NO.30 802.11a What are the supported rates ()?

NO.31 There are four wireless STA, According to the following backoff time parameters, which workstation has the priority to occupy the channel?

NO.32 exist WDS One in the network Root AP Can connect multiple Leaf AP , But a Leaf AP Only one can be connected Root AP .

NO.33 Originally only supported TKIP The wireless network card can be upgraded through the driver to support AES encryption.

NO.34 For the choice of WLAN coverage antennas, it is recommended to choose () for long and narrow areas, and () for wide and short-distance areas.

NO.35 thin AP In the networking, which of the following authentication methods is not required in the authentication process AC participate().

NO.36 BSS Which two basic service sets are included ()? (Select 2 Answers)