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Refer to the exhibit. The Ethernet network has been configured with OSPF. All routers, except R4 are established as OSPF neighbors. The priority of R1 and R3 has been manually set and R2 and R4 has been left default. All other values in all routers are left by default. Which is the possible cause that R4 is not establishing a neighbor relationship with the other routers?
R4 has different timer values.
Authentication is not set.
The network segment of the interface is different.
The profile must be set to either DR or DROTHER.
The priority of R4 must be manually set.
The network 192.168.100.16/28 is used on the entire network; however R4 is in network 192.168.100.32/28. If configured network is different no communication will be able to occur, therefore no establishment of neighbor will ever happen. The timer and authentication might be a problem when establishing a neighbor, but as the question states, the values has been left default. The priority will be set only if the router must be the DR or the BDR.
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