Which of the following fields is not included in the He1lo packet of the OSPF protocol? ()

• A.Network Mask
• B.HelloInterval
• C.Neighbor
• D.sysname

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Broadly speaking, which of the following does the transmission medium that constitutes the wireless local area network wlan not include?

• A.Infrared
• B.Laser
• C.Ray
• D.Radio waves

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What is the port number used by the FTP protocol control plane?

• A.23
• B.24
• C.21
• D.22

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What is the coverage area of an AP in WLAN?

• A.ESS
• B.SSID
• C.BSS
• D.BSSID

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The output information of a certain router is shown in the figure. Which of the following statements are correct? () (Multiple Choice Questions)

• A.The cost value of this interface is 1
• B.The Router ID of the router is 10.0.1.1
• C.This router is BDR
• D.The DR priority of this routing interface is 10

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