Refer to the exhibit. Why are routers R1 and R2 not able to establish an OSPF adjacency?
- The serial interfaces are not in the same area.
- The process numbers are not the same in both routers.
- A backbone router cannot establish an adjacency with an ABR router.
- The router ID values are not the same in both routers.
Explanation: On router R1, the network 192.168.10.0/30 is defined in the wrong area (area 1). It has to be defined in area 0 in order to establish adjacency with router R2, which has the network 192.168.10.0/30 defined in area 0.
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