A、Optical fiber transmission network is the foundation of broadband metropolitan area network
B、The integration of traditional telecommunication, cable TV and IP services has become the core service of broadband metropolitan area network
C、Switches in Layer 2 is the core equipment of broadband metropolitan area network
D、Expanding the scale and service quality of broadband access is the key to developing the application of broadband metropolitan area network
喵查答案:Switches in Layer 2 is the core equipment of broadband metropolitan area network