单项选择题 A new server was installed for the purpose of monitoring network traffic. The network has been configured in such a way that all traffic will be mirrored out the port this server is connected to. When reviewing the network traffic logs on the server only traffic destined to the server is listed in the logs. Which of the following is preventing the server from seeing all network traffic?（）

单项选择题 An administrator is looking to apply a new service pack for an OS on several systems that run business critical applications for a large international finance corporation. Which of the following should the administrator do FIRST?（）

单项选择题 Which of the following servers resolves computer names to IP addresses?（）