单项选择题
A. The switches are not stackable
B. The cable was not wired using 568A
C. The cable needs to be a crossover cable
D. The switches have IGMP snooping enabled
单项选择题 Which of the following wiring distribution components should be chosen to provide level integrateddiagnostic capabilities?（）
单项选择题 A demarcation point is usually installed and managed by which of the following providers?（）
单项选择题 Prioritizing traffic between data and voice is defined as which of the following?（）