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Answer: Within a simple OSPF network (no LAN, no area), neighboring nodes exchange their Router LSAs and learn what number of links its neighbor has, and their interface IP addresses. After neighbor propagation, all OSPF nodes retain the same involving Router LSAs in their LSDBs. Now they have related knowledge of network topology. First off, what does "IS" are a symbol of in "ISIS"? It is a symbol of "Intermediate System", which appears to be a number of routers. to Autonomous Systems, which are logical associated with routers, an intermediate System is simply a singl