多项选择题
Which three pre-conditions must be met before an OSPF router can perform graceful restart？（）
A.Router must be ABR B.Router must contain one sham link. C.The network topology must be stable. D.Router must be able to forward packets. E.Neighbors must support graceful restart.
单项选择题 WhatisthecorrectvirtuallinkconfigurationonanOSPFrouter？（）
多项选择题 InJUNOSsoftware，whataretwowaystherouterIDischosen？（）
单项选择题 InJUNOSsoftware，whatisrequiredtodedistributeRIProutesintoOSPF？（）
