单项选择题 A company is about to install a second network connect on with a new ISP. Which of the followingrouting protocols is the BEST choice?（）

单项选择题 An administrator wants to be alerted when a network-based attack is underway, but the company policy prohibits blocking or dropping network connections. Which of the following MUST be deployed?（）

单项选择题 Which of the following components is typically used for voice transmissions and has a 10Mbpsmaximum transfer speed?（）