多项选择题
Which two Internet Protocol (IP) telephony devices are best categorized as infrastructurecomponents?（）
A. Call management software
B. Media Convergence Servers (MCSs)
C. Voice gateways
D. IP telephones
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A. technical staffing
B. data center deployments
C. employee training
D. cost containment
E. operational efficiency
F. customer responsiveness -
单项选择题
What feature does the Partner E-Learning Connection provide?（）
A. Lists of training-partner class offerings
B. Hosted website that partners use to deliver e-learning to customers
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A. Optical network
B. Storage-area network (SAN)
C. Content delivery network (CDN)
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