单项选择题
A. 3 seconds for DIS; 9 seconds for non-DIS
B. 9 seconds for DIS; 3 seconds for non-DIS
C. 10 seconds for DIS; 3 seconds for non-DIS
D. 10 seconds for all routers
多项选择题 What are the three components of the ISO NET address?（）
单项选择题 Three IS-IS routers on a broadcast segment have different priority values configured. Which router is elected the DIS on that broadcast segment?（）
单项选择题 What type of OSPF router is responsible for redistributing routes into OSPF?（）