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Cisco 300-410 Exam - Topic 15 Question 106 Discussion

Refer to the exhibit.A network administrator sets up an OSPF routing protocol for a DMVPN network on the hub router. Which configuration required to establish a DMVPN tunnel with multiple spokes?
A) ip ospf network point-to-multipoint on both spoke routers
B) ip ospf network point-to-point on the hub router
C) ip ospf network point-to-multipoint on One spoke router
D) ip ospf network point-to-point on both spoke routers

Cisco 300-410 Exam - Topic 15 Question 106 Discussion

Actual exam question for Cisco's 300-410 exam
Question #: 106
Topic #: 15
[All 300-410 Questions]

Refer to the exhibit.

A network administrator sets up an OSPF routing protocol for a DMVPN network on the hub router. Which configuration required to establish a DMVPN tunnel with multiple spokes?

Show Suggested Answer Hide Answer
Suggested Answer: A

Option A configures uRPF loose mode to forward the packet. This mode allows the router to check if there is a route in the routing table that matches the source IP address of the incoming packet, regardless of the interface that is used to reach the source.This mode is suitable for networks that have asymmetric routing, where the incoming and outgoing interfaces for a packet may differ2.

Option B permits the 172.16.3.251 in the inbound ACL on interface gi0/3. This option does not resolve the issue, because it only allows the packet to pass the ACL check, but not the uRPF check.The packet will still be dropped by uRPF if there is no route to reach the source IP address via the same interface3.

Option C permits the 172.16.3.251 in the inbound ACL on interface gi0/3 to allow 172.16.3.251. This option is redundant and incorrect, because it repeats the same IP address twice in the ACL statement.It also does not resolve the issue for the same reason as Option B3.

Option D configures uRPF strict mode to forward the packet. This option does not resolve the issue, because it is the same mode that was already configured on the interface. Strict mode requires that the router has a route to reach the source IP address via the same interface where the packet was received.If this condition is not met, the packet will be dropped4.


by Leota at Jan 23, 2025, 06:20 AM

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Stephaine
9 months ago
Wait, are we sure about this? Sounds a bit off.
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Arthur
9 months ago
No way, point-to-multipoint is the way to go here!
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Lemuel
10 months ago
I thought point-to-point was better for spokes?
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Luis
10 months ago
Definitely option A! Makes the most sense.
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Alberto
10 months ago
OSPF needs point-to-multipoint for DMVPN.
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Mitsue
10 months ago
I remember that point-to-multipoint is generally used for spokes, but I can't recall if the hub needs a different setting. This is tricky!
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Charlie
11 months ago
I’m a bit confused about whether the hub needs point-to-point or point-to-multipoint. I think I saw something about point-to-point being used on the hub in another practice question.
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Jacklyn
11 months ago
I practiced a similar question where we had to choose between point-to-point and point-to-multipoint, and I feel like point-to-multipoint is the right choice for the hub.
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Erick
11 months ago
I think I remember that for DMVPN, we usually set OSPF to point-to-multipoint on the spokes, but I'm not entirely sure if it applies to the hub too.
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Delsie
11 months ago
This question is testing my knowledge of OSPF and DMVPN configurations. I'll need to carefully analyze each option and think through the network topology to determine the right solution.
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Rodolfo
11 months ago
I'm a bit confused by the different OSPF network types mentioned. I'll need to double-check my notes to make sure I understand the differences before selecting an answer.
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Hollis
11 months ago
Okay, I've got this. The DMVPN tunnel needs to be point-to-multipoint on the spoke routers, so option A is the correct answer.
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Karl
11 months ago
Hmm, the key here seems to be understanding the OSPF network type required for a DMVPN hub-and-spoke topology. I'll need to think through the differences between point-to-point and point-to-multipoint.
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Celeste
11 months ago
This looks like a tricky OSPF configuration question. I'll need to carefully review the DMVPN and OSPF network types to determine the right approach.
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Jettie
1 year ago
I think Option C is the way to go. Setting one spoke router to point-to-multipoint should allow it to communicate with the hub and other spokes.
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Malinda
1 year ago
You might be right, having both spoke routers set to point-to-multipoint could improve the network setup.
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Annabelle
1 year ago
But wouldn't it be better to have both spoke routers set to point-to-multipoint for better communication?
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Marcos
1 year ago
I agree, Option C seems like the correct choice for setting up the DMVPN tunnel.
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Gilberto
1 year ago
Haha, this question is giving me flashbacks to my CCNA days. Remember, kids, always read the documentation carefully!
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Yuonne
1 year ago
Option D) ip ospf network point-to-point on both spoke routers
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Veda
1 year ago
Option B) ip ospf network point-to-point on the hub router
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Lea
1 year ago
Option A) ip ospf network point-to-multipoint on both spoke routers
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Rosendo
1 year ago
I see your point, but I think having point-to-multipoint on both spoke routers makes more sense for a DMVPN network.
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Gwenn
1 year ago
Hmm, I'm not sure about that. Shouldn't the spoke routers be in a point-to-multipoint configuration to connect to the hub? I'll have to double-check the DMVPN documentation.
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Bonita
1 year ago
User 2: Yeah, that makes sense. The spoke routers need to be in a point-to-multipoint configuration to connect to the hub.
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Pearlie
1 year ago
User 1: I think it's A) ip ospf network point-to-multipoint on both spoke routers.
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Leandro
1 year ago
Option B seems correct, since the DMVPN network requires a point-to-point configuration on the hub router to establish tunnels with multiple spokes.
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Devorah
1 year ago
I disagree, I believe the correct answer is B) ip ospf network point-to-point on the hub router.
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Rosendo
1 year ago
I think the answer is A) ip ospf network point-to-multipoint on both spoke routers.
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