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单选题
A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?（）
A
The switches are not stackable
B
The cable was not wired using 568A
C
The cable needs to be a crossover cable
D
The switches have IGMP snooping enabled
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单选题A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?（）A
The switches are not stackableB
The cable was not wired using 568AC
The cable needs to be a crossover cableD
The switches have IGMP snooping enabled
考题
单选题While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist?（）A
the session layerB
the protocol layerC
the data link layerD
the access layerE
the network layerF
the application layer
考题
单选题A technician needs to assign a default subnet mask for a class B network to a network device that was just installed. Which of the following would the technician use?（）A
224.0.0.1B
255.0.0.0C
255.255.0.0D
255.255.255.0
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