单项选择题
What is the default value of the SPT threshold in Cisco routers?（）
A. 0 B. 1 C. 2 D. 4 E. 16 F. infinity
单项选择题 To which of these does IP multicast send packets?（）
单项选择题 Which of these ports does syslog use to send messages to a syslog server?（）
单项选择题 Which of these is a benefit of ESM?（）
