单项选择题
A. standby 1 priority 130
B. standby 1 preempt
C. standby 1 track fastethernet 0/0
D. standby 1 track 10.10.10.1
多项选择题 Routers can send hello messages in three HSRP states. Which ones are they？（）
多项选择题 Router R1 is configured for HSRP. Which of the following are valid HSRP states on R1？ （）
多项选择题 You have configured router R1 with HSRP， using the standard defaults. Which three statements are true of a default HSRP configuration？（）
