单项选择题
You are about to design a very fast convergence time on a service provider network. Which feature wouldyou utilize to declare a link failure within less than two seconds of the fault on a link？（）
A.fast convergence SFP B.MTU discovery C.redundancy links D.keepalive E.carrier delay
多项选择题 Whichthreeofthesecanbeaforwardingequivalenceclass？（）
单项选择题 HowmanybitsdoesEXPoccupyintheMPLSlabelheader？（）
单项选择题 WhatistheminimumhardwareconfigurationofthemultishelfCiscoCRS-1system？（）
