1.The OSPF Hello protocol performs which of the following tasks? (Choose two.)
A. It provides dynamic neighbor discovery.
B. It detects unreachable neighbors in 90 second intervals.
C. It maintains neighbor relationships.
D. It negotiates correctness parameters between neighboring interfaces.
E. It uses timers to elect the router with the fastest links as the designated router.
F. It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.
Answer: AC
解释一下:OSPF的Hello包的作用是发现并维持邻居关系。
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