多项选择题
For SONET ring switching， the 50ms switch time： Select all that apply？（）
A.Plncludes the detection time B.Applies to rings smaller than 1200km C.Applies to rings smaller than 1000km D.Includes up to 16 nodes
单项选择题 InMPLStrafficengineering，whichoneofthefollowingprotocolsisusedforPathSetup？（）
单项选择题 WhatdoesFRTPstandfor？（）
单项选择题 GMPLSisbaseduponNon-Packet-baseddevices.（）
