多项选择题 An administrator needs to authenticate users to the network, authorize network activities, and account for activities done. Which of the following are services that will BEST meet these goals?（）(Select TWO).

单项选择题 Which of the following is a secure method of copying information over a public network?（）

多项选择题 Which of the following protocols allow the set up, teardown and streaming of VoIP traffic? （）(SelectTWO)