单项选择题
For acceptable voice calls, the packet error rate should be less than（）%
A.0.01 B.0.1 C.1 D.2.5
多项选择题 What are three primary activities in the cycle of building an enterprise security strategy?（）
多项选择题 Which two of these are recommended practices with trunks? （）
单项选择题 When is the site-to-site remote access model appropriate? （）
