Exam 350-401 topic 1 question 118 discussion

No source given, when the config is applied between 2 routers: *Sep 25 13:36:55.438: %OSPF-5-ADJCHG: Process 1, Nbr 4.4.4.4 on GigabitEthernet0/0 from FULL to DOWN, Neighbor Down: Dead timer expired When you set the hello the dead is automatically changed to 4x the hello: Timer intervals configured, Hello 2, Dead 8 The other side is default (Hello of 10s) hence sends it too late every time. B is correct

B is correct there´s hello missmatch

I was considering the scenario if the hello timer was left at default for R1. I almost considered answer D: but then I noticed it shows both routers as BDR. Based on the subnet, only these two routers could exist on the segment, so one would have to be a DR, the other a BDR. Answer D says both are BDRs, but one has to be a DR. Even if there were more routers on a segment, you still would only have one BDR so if another router were DR, then either R1 or R2 would be 2WAY/DROTHER, or both. Then I saw answer C. Indeed both would be full, though one would be DR, the other BDR, if it weren't for the hello timer change. But then we don't have enough information to determine the election results. Need priority, router ID, loopback IPs and all other IPs on the routers.

Test in GNS3 it was due to different timer set OSPF was form after R2 set the same timer ip ospf hello-interval 2

so if the hello set to 3 it will be established?

B is the correct ans

Timers must match between 2 ospf router to be neighbors

B is correct answer