单项选择题 A user reports that their laptop does not have network connectivity, but was working fine last week. The technician executes IPCONFIG to see what the IP address is but it comes up with a 169.254.254.1 address. This address is not part of the companys subnet. Which of the following MOST likely identifies this address type?（）

单项选择题 In which of the following topologies could the failure of one machine cause the entire network tostop functioning?（）

单项选择题 Which of the following would be used to lock all of the primary communication equipment of abuilding, including its demarcation point?（）