https://sites.google.com/site/amitsciscozone/home/juniper-junos/junos--ospf-designated-router
OSPF DR Election:
On a broadcast network, DR election takes place based on OSPF router priority. The Priority is set to 128 by default by JUNOS software. In case of a tie, the router with highest router-id is elected the DR.
Answer is "D"
"OSPF bases the election of the designated router on two election criteria: priority and RID. OSPF DR priorities can range from 0 through 255, with the Junos operating system default being 128. A router with a higher priority has a better chance of becoming the designated router because priority is the first tiebreaker in a DR election. A router with a DR priority of 0 is not eligible for election and never becomes the designated router. In the event of a priority tie, the second tiebreaker for DR elections is the RID of the routers—the higher the value of the RID, the better the chance of becoming the designated router for the segment." Answer is D.
It can't be B as the priority is lower then the router R1 and R2. Only those could become the DR, and since they are tied the highest RID becomes the DR So D R2 is the correct answer. https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/nxos/commands/ospf/ip-ospf-priority.html
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