Exam 200-301 All Questions

View all questions & answers for the 200-301 exam

Exam 200-301 topic 1 question 454 discussion

Actual exam question from Cisco's 200-301

Question #: 454
Topic #: 1

Refer to the exhibit. R5 is the current DR on the network, and R4 is the BDR. Their interfaces are flapping, so a network engineer wants the OSPF network to elect a different DR and BDR. Which set of configurations must the engineer implement?

A. R4(config)#interface gi0/0 R4(config-if)#ip ospf priority 20 R5(config)#interface gi0/0 R5(config-if)#ip ospf priority 10
B. R5(config)#interface gi0/0 R5(config-if)#ip ospf priority 120 R4(config)#interface gi0/0 R4(config-if)#ip ospf priority 110
C. R3(config)#interface gi0/0 R3(config-if)#ip ospf priority 255 R2(config)#interface gi0/0 R2(config-if)#ip ospf priority 240
D. R2(config)#interface gi0/0 R2(config-if)#ip ospf priority 259 R3(config)#interface gi0/0 R3(config-if)#ip ospf priority 256

Show Suggested Answer

Suggested Answer: C 🗳️

by arenjenkins at Sept. 27, 2022, 6:53 p.m.

Comments

Submit Cancel

mda2h

Highly Voted 1 year, 12 months ago

Selected Answer: C

Max priority is 255 and all routers here have priority 1. DR/BDR election's based on highest priority!

upvoted 15 times

...

4aynick

Highly Voted 2 years, 2 months ago

Selected Answer: C

highest metrik is DR. max 255

upvoted 6 times

...

Arinamohammed

Most Recent 11 months, 3 weeks ago

why it can't be A? It also change the DR and BDR

upvoted 1 times

c9957e3

11 months ago

because the default priority is 1. If you choose A, you're essentially increasing the priority of R4 and R5. So the Dr and BDR does not change.

upvoted 1 times

MicroDiff

7 months, 2 weeks ago

DR and BDR does change, but as informed the link is flapping and this don't solve the problem.

upvoted 1 times

...

[Removed]

1 year, 3 months ago

Selected Answer: C

C is correct D is incorrect because OSPF priority range is 0-255 so its out of range

upvoted 2 times

...

picho707

1 year, 8 months ago

The route with a priority of 255 is selected due to the fact that this is the Max value. This forces the configuration to elect the router with this priority. It is not recommended to use priority 255 unless it is really necessary.

upvoted 1 times

...

luij

1 year, 8 months ago

It took me a while to realize that router 3 is NOT in the OSPF “neighborhood” (check the exhibit). Maybe that’s why answer A is correct and C is not.

upvoted 1 times

luij

1 year, 8 months ago

I’m sorry. My bad here. Disregard my previous comment. Of course router 3 is in the OSPF neighborhood.

upvoted 2 times

...

J0k3r07

1 year, 5 months ago

its because the command was done on R3 so the list shows its neighbors

upvoted 2 times

...

[Removed]

1 year, 9 months ago

Selected Answer: C

The question only asks us to change the current conditions. So both A and C provide the answer. This question is broken. Anyway I will go with C

upvoted 1 times

...

Swiz005

2 years, 2 months ago

Selected Answer: C

The answer is C - manually forcing the priority

upvoted 2 times

...

RougePotatoe

2 years, 8 months ago

Selected Answer: A

This really depends on what the question is trying to ask. Yes option C will also achieve the same effect but you are manually forcing R3 and R2 to become DR and BDR. The question only asked for you to have OSPF elect a different DR and BDR so I think A fits best as it will leave OSPF to elect a DR and BDR instead of you basically forcing it.

upvoted 4 times

RougePotatoe

2 years, 8 months ago

I messed up OSPF's default priority value is 1 so A would do nothing. ANSWER IS C.

upvoted 6 times

...

arenjenkins

2 years, 8 months ago

why not D?

upvoted 1 times

EngrRex

2 years, 8 months ago

OSPF priority range is 0-255. D is out of range

upvoted 9 times

...

MikD4016

2 years, 8 months ago

because the value can go from 0 to 255 (default = 1): with 0 you avoid the election to DR / BDR, with higher values you can drive it at will. If all the routers on the LAN have priority = 0, OSPF will not work

upvoted 6 times

...