单项选择题
In IS-IS, how long will the restart helper keep the restarting router in the up state?（）
A. until the hello dead timer expires B. until the restart duration timer expires C. until the restarting router sets the down bit D. until the restart helper sends out three CSNPs
单项选择题 What is the function performed by LSA Type 1?（）
单项选择题 On what is the Martini control plane based?（）
多项选择题 Which two statements are correct regarding IS-IS?（）
