单项选择题
A. Interface authentication must be configured
B. The routing processes must be configured with an area ID
C. IP unicast routing must be enabled
D. IPv4 ad dresses must be applied to the interfaces
单项选择题 Refer to the parti al configurations in the exhibit. What address is utilized for DR and BDR identification on Router1?（）
多项选择题 Which two statements are true about IS - IS?（）
多项选择题 Intermediate system to intermediate system (IS - IS), is a protocol used by network devices (routers) to determine the best way to forward datagrams through a packet - switched network, a process called routing. Which three attributes are of the IS - IS routing protocol? （）
