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Cisco 300-510 Exam - Topic 13 Question 112 Discussion

Refer to the exhibit.OSPF is an interior routing protocol on the network Routers R4 and R6 are in area 0 and all tunnels are in area 2 R4 is connected to R6 with a 1 Gbps link and with 100 Mbps links to the rest of the LAN After the most recent maintenance window a network engineer noticed that R4 is using a suboptimal route toward 10 173 12 10 instead of the route via R6 Which action must the network engineer take to correct reachability toward 10 173.12 10/24?
A) Configure auto-cost reference-bandwidth 1000 under the global OSPF configuration on R4
B) Configure ip ospf 0 area 0 under tunnel 2 on both R4 and R5
C) Configure ip ospf cost 120 under the Gi0/0 interface on R4
D) Configure ip ospf 2 area 0 under tunnel 3 on both R6 and R5

Cisco 300-510 Exam - Topic 13 Question 112 Discussion

Actual exam question for Cisco's 300-510 exam
Question #: 112
Topic #: 13
[All 300-510 Questions]

Refer to the exhibit.

OSPF is an interior routing protocol on the network Routers R4 and R6 are in area 0 and all tunnels are in area 2 R4 is connected to R6 with a 1 Gbps link and with 100 Mbps links to the rest of the LAN After the most recent maintenance window a network engineer noticed that R4 is using a suboptimal route toward 10 173 12 10 instead of the route via R6 Which action must the network engineer take to correct reachability toward 10 173.12 10/24?

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Suggested Answer: A

by Lonna at Jul 08, 2025, 11:29 PM

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Bernardo
8 months ago
B doesn't seem relevant to the problem at all.
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Brett
9 months ago
Wait, why are we using a 100 Mbps link for OSPF?
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Fabiola
9 months ago
I think C could work too, but not sure.
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Ahmad
9 months ago
Definitely A, that will fix the cost issue!
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Paola
9 months ago
OSPF uses cost for routing decisions.
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Markus
9 months ago
I vaguely recall that tunnels can affect OSPF routing, but I can't remember if we need to adjust the area settings for the tunnels in this case.
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Lynda
10 months ago
I think I read that OSPF prefers the lowest cost path, but I’m not confident if configuring the cost directly on the interface is the best approach.
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Sue
10 months ago
This question feels similar to one we practiced where adjusting the reference bandwidth helped with route optimization. Maybe option A is the key?
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Kina
10 months ago
I remember something about OSPF cost influencing route selection, but I'm not sure if changing the cost on R4's interface is the right move here.
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Gerry
10 months ago
Based on the information provided, I think the most straightforward solution is to adjust the OSPF cost on the Gi0/0 interface of R4. That should steer the traffic to the optimal route through R6.
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Jaime
10 months ago
Hmm, I'm a bit confused. Wouldn't configuring the auto-cost reference-bandwidth on R4 also work? Or is that not the best approach here?
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Micah
11 months ago
I'm pretty confident the answer is C. Configuring the cost on the Gi0/0 interface of R4 should force the traffic to use the higher-bandwidth link through R6.
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Teddy
11 months ago
Okay, let me think this through step-by-step. R4 and R6 are in area 0, and the tunnels are in area 2. The issue is that R4 is using a suboptimal route to 10.173.12.0/24 instead of the route through R6. I think the key is to adjust the OSPF cost on the right interface.
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Denny
11 months ago
This question seems straightforward, but I want to make sure I understand the topology and OSPF configuration before selecting an answer.
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Cassie
1 year ago
Option C seems like the way to go. Who needs fancy auto-cost when you can just manually set the interface cost? Gotta love the old-school OSPF tricks.
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Lera
12 months ago
User2: Yeah, manually setting the interface cost seems like a reliable solution.
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Dawne
1 year ago
User1: I think option C is the best choice here.
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Derrick
1 year ago
I think Corazon is right, adjusting the cost on the specific interface should help correct the reachability issue.
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Tatum
1 year ago
But wouldn't adjusting the cost on the interface affect all routes, not just the one to 10.173.12.10?
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Denise
1 year ago
Haha, I bet the network engineer is scratching their head, wondering why OSPF is being so stubborn. Time to break out the command line and get their hands dirty!
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Argelia
11 months ago
User 2: Or they could configure ip ospf cost 120 on the Gi0/0 interface of R4.
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Dianne
1 year ago
User 1: Maybe they should try configuring auto-cost reference-bandwidth 1000 on R4.
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Corazon
1 year ago
I disagree, I believe the correct answer is C) Configure ip ospf cost 120 under the Gi0/0 interface on R4.
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Joye
1 year ago
I'm not sure, but I think option A might be the right choice. Adjusting the reference bandwidth could help OSPF choose the faster 1 Gbps link instead of the slower 100 Mbps links.
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Irma
1 year ago
User 2: Yeah, that makes sense. It should prioritize the 1 Gbps link over the slower ones.
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Leota
1 year ago
User 1: I think option A is a good choice. Adjusting the reference bandwidth could help OSPF choose the faster link.
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Tatum
1 year ago
I think the answer is A) Configure auto-cost reference-bandwidth 1000 under the global OSPF configuration on R4.
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Timmy
1 year ago
The correct answer is C. The issue seems to be that OSPF is not picking the optimal route due to the link cost, so we need to manually configure the cost on the interface to make it lower than the current route.
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Kenda
1 year ago
No, I believe the correct answer is C. We should manually configure the cost on the interface to improve the route.
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Janna
1 year ago
I think the correct answer is A. We need to adjust the reference bandwidth to make the route more optimal.
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