Which of the following statements is correct for the ACL configured in the Telnet application? ()

• A.The device with IP address 172.16.105.5 can use Telnet service
• B.The device with P address 172.16.105.4 can use Telnet service
• C.The device with IP address 172.16.105.3 can use Telnet service
• D.The device with P address 172.16.105.6 can use Telnet service

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As shown in the figure. All four switches are running $TP. Various parameters are set to default values. If the GO/0/2 port of switch C is blocked and cannot send configuration BPDUs through this port, how long will it take for the blocked port in the network to enter the forwarding state? () (Single-choice question)

• A.About 30 seconds
• B.About 15 seconds
• C.About 3 seconds
• D.About 50 seconds

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What are the three sources for routers to obtain routing entries? ()*

• A.Static routing
• B.Aggregate routing
• C.Direct route
• D.Dynamic routing

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ARP request is sent by ()

• A.There are broadcast and unicast
• B.Multicast
• C.broadcast
• D.Unicast

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Which of the following IEEE802.11 standards does not support the 5GHz frequency band for communication? ()

• A.802.11aC.wave 2
• B.802.11aC.wave 1
• C.802.11n
• D.802.11g

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