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Refer to the diagram. The network is running OSPF. Which of the following is most likely the cause that R1 and R2 are not able to form an adjacency?
The OSPF process ID is different on both routers.
The loopback addresses are on different subnets.
The command "summary-address network" is configured on both routers.
The values of the hello timer are different on both routers.
To become an OSPF neighbors, router R1 and R2 must have the same Hello/Dead intervals, the same Area ID, the same subnet mask and the same authentication (if configured). For more information refer to: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13699-29.html
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