多项选择题
What are two design guidelines for VoIP networks？（）
A. Delay should be no more than 10 ms. B. Loss should be no more than 1 percent. C. Jitter should be less then 40 ms. D. Managed bandwidth is strongly recommended for voice control traffic.
单项选择题 Foracceptablevoicecalls，thepacketerrorrateshouldbelessthan（）%
多项选择题 Whatarethreeprimaryactivitiesinthecycleofbuildinganenterprisesecuritystrategy？（）
多项选择题 Whichtwoofthesearerecommendedpracticeswithtrunks？（）
