多项选择题
A.provides common view of entire topology
B.exchanges routing tables with neighbors
C.calculates shortest path
D.utilizes event-triggered updates
E.utilizes frequent periodic updates
单项选择题 What is the default administrative distance of OSPF?（）
单项选择题 Refer to the exhibit. A network administrator configures a new router and enters the copy startup-config running-config on the router. The network administrator powers down the router and sets it up at a remote location. When the router starts, it enter the system configuration dialog as shown. What is the caust of the problem?（）
多项选择题 Which statements describe the routing protocol OSPF?（）