多项选择题
A. It converges quickly.
B. OSPF is a classful routing protocol.
C. It uses cost to determine the best route.
D. It uses the DUAL algorithm to determine the best route.
E. OSPF routers send the complete routing table to all directly attached routers.
F. OSPF routers discover neighbors before exchanging routing information.
多项选择题 Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable?（）
多项选择题 Which two subnetworks would be included in the summarized address of 172.31.80.0 /20?（）
多项选择题 What can be determined from the line of show ip route output shown in the exhibit?（）