问题
单项选择题
Network managers have long (140) practical voice-over-IP (VOIP) solutions. VOIP (141) ease network management and decreases costs by converging a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’s head-quarters with far-reaching branch offices can (142) tremendous amounts of (143) in long distance phone bills, provided that solution delivers POTS-like voice (144) over the Internet.
A．frequency
B．length
C．quality
D．quantity
答案
参考答案：C
解析：
[分析]： 网络管理员一直盼望着实用的IP话音业务(VOIP)解决方案。VOIP通过将公司的电话和数据基础设施集成于同一网络，简化了网络管理，降低了成本。如果VOIP解决方案用于拥有远程分支机构的公司总部，那么通过Internet提供类似POTS的声音质量，可节省大量的长途话费。