单选题An administrator replaces the network card in a web server. After replacing the network card some users can access the server but others cannot. Which of the following is the FIRST thing the administrator should check？（）A Default gatewayB The ports on the switchC Port security on the servers switch portD Ethernet cable
单选题
An administrator replaces the network card in a web server. After replacing the network card some users can access the server but others cannot. Which of the following is the FIRST thing the administrator should check？（）
A
Default gateway
B
The ports on the switch
C
Port security on the servers switch port
D
Ethernet cable
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