For routers running Open Shortest Path First (OSPF), a link-state routing protocol, to form neighbor adjacencies, the Hello and Dead intervals must be the same on both routers. These intervals control the timing of Hello packets and the detection of inactive neighbors. If these timers differ, the routers will not recognize each other as neighbors. Other parameters like Router IDs and Process IDs do not need to match for adjacency formation.
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Cisco CCNA 200-301
IP Connectivity
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