单项选择题 A small business with eight employees has just opened their office in a renovated loft in a busy downtown area. The owner of the building does not want to run any additional wiring beyond power, to preserve the historic nature of the building. Because of this stipulation, almost all tenants in the building have chosen to implement wireless. Which of the following should be the FIRST step in setting up this SOHO network?（）

单项选择题 An administrator needs to terminate network cables that have just been installed in the main communications closet. Which of the following tools is required?（）

单项选择题 A user receives a call from someone reporting to be from the help desk who asks for their password. The user discovers later that the caller did not work for the help desk. Which of the following describes this type of exploit?（）