题目内容

Which two restrictions must the Enterprise Campus network designer consider when evaluatingWAN connectivity options？（）

A. OSPF over multicast EMS or VPLS network may not have consistent broadcast or multicastperformance
B. IP multicast is not supported over Lover 3 MPLS VPN； instead a Layer 2 MPLS WN must beutilized with service provider support
C. QoS requirements with MPLS-VPN must be implemented by the service provider
D. Hierarchical VPLS designs are the least scalable
E. IGMP snooping is not on option with VPLS or EMS； instead administrative scoping or allowingsufficient bandwidth for unnecessary multicast traffic at the edge links is required

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A. “待摊费用”的借方
B. “待摊费用”的贷方
C. “制造费用”的借方
D. “管理费用”的贷方

A. 16—18次/min
B. 19—24次/min
C. 25—29次/min
D. 30—39次/min
E. 40—45次/min

A. 每个路由器都会剥离数据包的第2层帧头
B. 数据包的第2层目的地址不发生改变
C. 数据包的第3层源地址经过每台路由器时都发生改变
D. 第2层帧头经过每台路由器时都发生改变
E. 每个路由器都会剥离数据包的第3层帧头

A. “待摊费用”
B. “预提费用”
C. “制造费用”
D. “基本生产成本”