多项选择题
In the Carrier Support Carrier （CsC） feature， which two protocols run CSC-PE and CSC-CS ？（）
A.EBGPv4 with a sending community B.IGP and LDP C.EBGPv4 with a sending label D.IGP and EBGPv4 E.IGP and RSVP
单项选择题 WhichstatementaboutstandardSTS-1SONETframingistrue？（）
单项选择题 WhatisthedefaultBGPscannertime？（）
单项选择题 Youareabouttodesignaveryfastconvergencetimeonaserviceprovidernetwork.Whichfeaturewouldyouutilizetodeclarealinkfailurewithinlessthantwosecondsofthefaultonalink？（）
