On a multiaccess VLAN three routers participate in OSPF: R1 priority 100, R2 priority 1, R3 priority 0. After adjacency formation which statement is correct?
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Correct answer: R1 becomes DR and R2 becomes BDR; R3 cannot be DR/BDR.
Why this is the answer
In OSPF, the router with the highest OSPF priority becomes the Designated Router (DR), and the second-highest becomes the Backup Designated Router (BDR). If priorities are equal, the router with the highest router ID breaks the tie. R1 has a priority of 100, which is the highest, making it the DR. R2 has a priority of 1, which is the next highest, making it the BDR. R3 has a priority of 0, which means it is ineligible to become a DR or BDR. Priority 0 does not prefer DR election; rather, it explicitly prevents a router from participating in the DR/BDR election. Virtual links are used to connect discontiguous areas, not for DR/BDR election on a multiaccess segment.
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