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Cisco Exam 300-410 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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Jettie
1 months 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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Gilberto
1 months ago
Haha, this question is giving me flashbacks to my CCNA days. Remember, kids, always read the documentation carefully!
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Yuonne
5 days ago
Option D) ip ospf network point-to-point on both spoke routers
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Veda
12 days ago
Option B) ip ospf network point-to-point on the hub router
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Lea
22 days ago
Option A) ip ospf network point-to-multipoint on both spoke routers
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Rosendo
2 months 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
2 months 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
27 days 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 months ago
User 1: I think it's A) ip ospf network point-to-multipoint on both spoke routers.
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Leandro
2 months 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
2 months 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
2 months ago
I think the answer is A) ip ospf network point-to-multipoint on both spoke routers.
upvoted 0 times
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