单项选择题
What must be set correctly when configuring a serial interface so that higher-level protocols calculate the best route?（）
A. bandwidth B. delay C. load D. reliability
单项选择题 When configuring a serial interface on a router, what is the default encapsulation?（）
单项选择题 Which command displays CPU utilization?（）
单项选择题 Which command is used to debug a ping command?（）
