单项选择题

When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）

A.hub and spoke
B.PE
C.CE
D.hub
E.spoke

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多项选择题

All secure domain routers （SDRs） have shared attribute and resources. Which three resources are sharedall SDRs？（）

A.privilege-level configuration
B.fabric cards
C.SNMP traps
D.admin- level configuration
E.exec- level configuration

单项选择题

Which statement about VPLS is true？（）

A.All CE devices emulate a bridge
B.All provider devices emulate a bridge
C.Hierarchical VPLS reduces signaling overhead
D.Each PE device emulates a bridge
E.Each CE device emulates a bridge

单项选择题

What method of streaming live video is the least taxing on bandwidth in a large enterprise environment？（）

A.TCP
B.UDP
C.HTTP
D.Multicast