单项选择题
Which statement is true about Kompella-based and Martina-based VPNs？（）
A.Both use LDP B.Both use BGP C.Both require additional hardware. D.Both use a two-label stack for forwarding.
多项选择题 WhatarethreeexamplesofaCPE-provisionedVPN？（）
多项选择题 Whichtwostatementsaretruewhenconfiguringadomain-id？（）
单项选择题 WhichconditionmustbemettoallowaPEroutertoforwardVPNtrafficacrossaLSPinaLayer3VPNenvironment？（）
