The following statement about STP is correct. ______. (Multiple choice)

• A.STP eliminates possible path loops in the network by blocking redundant links in the network
• B.STP information transfer is realized by transferring BPDUs between bridges running STP
• C.STP can activate the blocked redundant backup link to restore network connectivity when the current active path fails
• D.In a complex network, STP consumes a lot of processing resources, causing the network to fail to work normally.

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The number of available host addresses contained in the natural classification network segment corresponding to the IP address 165.110.20.67 is. (Please fill in Arabic numerals)

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Different priority levels can be configured for Telnet users on the MSR router. What is wrong about this priority level is ______. (Multiple choice)

• A.2 is device level
• B.3 is management level
• C.0 is the access level
• D.1 is the monitoring level
• E.The smaller the value, the lower the user's priority
• F.The smaller the value, the higher the user's priority

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The following devices working at the data link layer of the OSI reference model are ______.

• A.WAN switch
• B.Hub
• C.Router
• D.Repeater

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DNS works on the ______ of the OSI reference model.

• A.Session layer
• B.Transport layer
• C.Application layer
• D.Network layer

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