单项选择题 The network technician is troubleshooting a network issue by implementing a new security device.After installing and configuring the device, which of the following steps should the technician takeNEXT?（）

单项选择题 When ordering switches for a new building, which of the following is the BEST way for the technician to determine the number of switches to put in each network closet?（）

单项选择题 A technician is using a packet sniffer to identify a server. The technician observes the following network traffic: Which of the following is MOST likely to be the server?（）