多选题

下列哪些是OSPF路由协议的特性？

Question

A. functions as a link-state routing protocol

B. discards packets when the hop count is greater than 15

C. calculates the shortest path to a destination using the Diffused Update Algorithm (DUAL)

D. created as a proprietary routing protocol

E. floods updates as topology changes occur

F. broadcasts routing updates every 90 seconds or as triggered by topology changes