Astute service providers realize that the continued support of legacy X.25 and asynchronous network elements using separate oper

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问题 Astute service providers realize that the continued support of legacy X.25 and asynchronous network elements using separate operations networks is cost(71). For example, the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each(72)Hence, additional maintenance procedures must be maintained and administrative records are(73). The duplication of transport facilities to carry(74)network traffic is an inefficient use of resources. And, not surprisingly, more technologies installed in a central office mean the necessity for more physical space, and an increase in power connections and power consumption. Migration of these(75)network elements to IP-based DCNs is a logical strategy.

选项 A、prohibitive
B、feasible
C、connective
D、special

答案A

解析 聪明的服务提供商认识到,继续使用单独的运营网络来支持旧的X.25 和异步网络元素的费用很昂贵。例如,维护多个网络需要增加工作人员。通常这些人员必须培训,以便熟悉多种制造商技术,同时还需要熟悉不同平台的许多工作小组。因此,额外增加的维护过程使得各种管理记录激增。承载着不同网络通信的多种传输设施造成了资源的无效使用。很自然的推论就是,更多的技术装置配备在交换局中意味着需要更大的物理空间,增加了动力设备和电源消耗。这些遗产网络元素逐步迁移到基于IP 的DCN 是复合逻辑的策略。
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