The 802.11 protocol is essentially to provide a link layer access service for wireless clients. If you need to query the IP address of the wireless client, which of the following commands can be used?

In WLAN, which of the following frames are control frames? (Multiple choice)

First of all, the multi-frequency combiner must be able to support the required working frequency band, and the closer its passband frequency is to the working frequency of the wireless system, the better, and there is no redundant passband, so as to ensure the best effect; secondly, it must be used for the combined with filtering function, the interval between ports should be greater than 80dB, which can minimize the interference between different systems.

Which of the following descriptions of electromagnetic waves is correct? (Multiple choice)

Which of the following descriptions about H3C FIT AP registration is correct? (Multiple choice)