For the polarization of electromagnetic waves, the following description is correct (Select 3 Answers).

• A.The antenna radiates electromagnetic waves to the surrounding space, and the direction of the electric field changes according to a certain law.
• B.If the electric field of the electric wave is perpendicular to the ground, we call it a vertically polarized wave.
• C.If the transmitting antenna is circularly polarized, the receiving antenna must also be circularly polarized, and both polarization directions must be the same
• D.The polarization of the antenna refers to the direction of the magnetic field strength formed by the antenna radiation.

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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.Poor scalability
• C.Not conducive to traffic regulation
• D.Low forwarding efficiency

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For outdoor WLAN coverage scenarios, which of the following descriptions is correct?

• A.The feeder interface must match the selected antenna
• B.The higher the antenna gain, the stronger the antenna directivity and the weaker the radiation gain directly below the antenna
• C.The length of the feeder must not exceed 2 meters
• D.Outdoor antennas should not blindly pursue high gain

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In the Fit AP network, which of the following authentication methods does not require AC to participate during the authentication process?

• A.PSK authentication
• B.802.1X authentication
• C.Portal authentication
• D.Shared key authentication

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Which of the following protocols are IEEE 802.11 standards Select 3 Answers)?

• A.802.11a/b/g/n
• B.802.1X
• C.802.11s
• D.802.11i

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