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?（）Athe session layerBthe protocol layerCthe data link layerDthe access layerEthe network layerFthe application layer
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 layer
B
the protocol layer
C
the data link layer
D
the access layer
E
the network layer
F
the application layer
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