单项选择题
Which condition must be met to allow a PE router to forward VPN traffic across a LSP in a Layer 3 VPN environment？（）
A.The BGP next hop must be in inet.1. B.The BGP next hop must be in inet.3. C.Must have a bidirectional LSP configured. D.Must have a static route to allow an RP for connected interfaces.
单项选择题 HowisthecostofavirtuallinkinOSFPcalculated？（）
单项选择题 WhatisthefunctionperformedbyLSAType1？（）
多项选择题 WhichthreeauthenticationoptionsdoesOSPFsupport？（）
