For shared key authentication, the following description is wrong.

• A.Shared key requires the user and AP to use the same shared key
• B.After using shared key authentication, WEP encryption must be used.
• C.The disadvantage of shared key is that it is not scalable and not very secure.
• D.For thin APs, the shared key is preset in the AC.

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Regarding the networking method, the following description is correct.

• A.The advantage of the three-layer networking is that the configuration is simple and the networking is easy.
• B.Compared with the three-layer networking, the second-tier networking is more suitable for large networks such as parks and stadiums.
• C.In the direct connection network, the service data of the AP can directly reach the uplink network without going through the AC.
• D.If the AC's ability to process data is weak, it is recommended to use a side-by-side networking.

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

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

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Which of the following commands can be used to view the AP running system version? (Multiple Choice)

• A.display ap update status all
• B.display ap run-info ap-id x (x is the ID number of the AP)
• C.display ap version all
• D.display ap all

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

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

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