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

单项选择题 Which of the following devices is used to connect multiple devices to a network and does not stopbroadcast traffic?（）

单项选择题 An administrator is troubleshooting a communication issue between two computers on the same Layer 2 switch. Which of the following is the BEST way to determine if the switch is causing the issue?（）