A．用例将系统的功能范围分解成许多小的系统功能陈述B．一个用例代表了系统的一个单一的目标C．用例是一个行为上相……

单项选择题The duplication of transport facilities to carry （） network traffic is an inefficient use of resources.

A．overlook
B．overlie
C．overlay
D．overleap

单项选择题Migration of these （） network elements to IP-based DCNs is a logical strategy.

A．traditional
B．dominancy
C．redundancy
D．legacy

单项选择题Additional maintenance procedures must be maintained and administrative records are （）.

A．declined
B．proliferated
C．destroyed
D．produced

单项选择题Sometimes requiring parallel groups specializing in each （）hence.

A．line
B．platform
C．server
D．switch

单项选择题Astute service providers realize that the continued support of legacy X.25 and asynchronous network elements using separate operations networks is cost （）.

A．prohibitive
B．feasible
C．connective
D．special