多项选择题
When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）
A.Layer 2 access link QoS design B.enterprise-to-service-provider mapping models C.Layer 3 link access QoS design D.service provider service level agreements E.Layer 2 link access load balancing
单项选择题 WhichdescriptionofBGPauthenticationistrue？（）
单项选择题 WhatisthetypicalmarkedDSCPvalueforavoicesignalingpacketinVoIPtechnology？（）
多项选择题 Whichthreestatementsabouttheroutetarget（RT）aretrue？（）
