What is a reason for an OSPF router to display a designated router ID of 0.0.0.0?
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A. B. C. D.C
The correct answer is D. The OSPF router displaying a designated router ID of 0.0.0.0 is an indication that it is unable to establish an adjacency with the designated router (DR) on the network segment.
When OSPF runs on a broadcast network such as Ethernet, one of the routers is elected as the DR, and another is elected as the backup designated router (BDR). The DR is responsible for sending updates to all other routers on the segment, while the BDR is on standby to take over if the DR fails.
If a router on the broadcast network is unable to establish an adjacency with the DR, it will not receive updates and will not be able to participate fully in the OSPF network. In this case, the router will display a DR ID of 0.0.0.0, indicating that it is not connected to the DR.
The other options, A, B, and C, are not correct because they do not relate to the DR election process in OSPF. MTU mismatches, subnet mask mismatches, and point-to-point interfaces can all affect OSPF adjacency formation, but they do not directly affect the DR election process or the display of a DR ID of 0.0.0.0.