多项选择题 Whichtwoofthesearerecommendedpracticeswithtrunks？（）

多项选择题 Whichtwodesignconcernsmustbeaddressedwhendesigningamulticastimplementation？（）

单项选择题 Lafeyette Productions is looking for a new ISP that has improved availability, load balancing, and catastrophe protection. Which type of ISP connectivity solution would be best?（）