Which of the following commands is used to display the CPU usage of a router?

• A.display cpu-state
• B.display interface
• C.display cpu-usage
• D.display memory

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Which encryption algorithm used by WLAN has the highest security strength?

• A.WEP
• B.CCMP
• C.DES
• D.TKIP

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The Tracert diagnostic tool records the () of each ICMP timeout message, so that it can provide the user with the IP address through which the message reaches the destination.

• A.Source IP address
• B.Destination port
• C.Destination IP address
• D.Source port

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DHCP is called Dynamic Host Configuration Protocol. It mainly assigns IP addresses and DNS information to hosts automatically. The messages used are ()

• A.ACK (acknowledgement)
• B.request
• C.Offer(Provided)
• D.discover

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The following description about the specified port of the spanning tree is correct ()

• A.The port on the root switch must not be a designated port
• B.The port on the root switch must be a designated port
• C.The designated port can forward configuration BPDU packets to the network segment connected to it

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