单选题A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem（）。AA remote physical layer problem exists.BThe host NIC is not functioning.CTCP/IP has not been correctly installed on the host.DA local physical layer problem exists.
单选题
A technician is troubleshooting a host connectivity problem. The host is unable to ping a server connected to Switch_A. Based on the results of the testing, what could be the problem（）。
A
A remote physical layer problem exists.
B
The host NIC is not functioning.
C
TCP/IP has not been correctly installed on the host.
D
A local physical layer problem exists.
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