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Cisco Exam 300-410 Topic 15 Question 98 Discussion

Actual exam question for Cisco's 300-410 exam
Question #: 98
Topic #: 15
[All 300-410 Questions]

Refer to the exhibit.

An engineer recently implemented uRPF by configuring the ip verify unicast source reachable-via rx command on interface gi0/3 The engineer noticed right after implementing F that an inbound packet on the giO-3 interface with a source address of 172 16 3 251 was dropped. Which action resolves the issue?

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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 Tegan at Sep 15, 2024, 08:25 PM

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Brandon
7 months ago
Hmm, that makes sense too. Let's see what others think before the exam.
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Keena
7 months ago
I disagree, I believe the correct answer is D) Configure uRPF strict mode to forward the packet.
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Theodora
7 months ago
Option A is the way to go, my friend. Loose mode will let the packet through, no problem.
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Augustine
6 months ago
D) Configure uRPF strict mode to forward the packet
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Junita
6 months ago
Got it, thanks for the advice!
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Devorah
6 months ago
B) Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.
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Theresia
6 months ago
A) Configure uRPF loose mode to forward the packet.
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Mohammad
7 months ago
Haha, I'm going to have to go with Option C. Gotta love those redundant answers that make you scratch your head!
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Dylan
7 months ago
I think Option B is the way to go. Permitting the source address in the ACL on the interface will allow the packet to pass through.
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Brandon
7 months ago
I think the answer is B) Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.
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Elmira
7 months ago
Option D makes the most sense. If the issue is that a packet with a source address of 172.16.3.251 is getting dropped, then we need to configure uRPF strict mode to forward the packet.
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Jacklyn
7 months ago
That should resolve the issue with the dropped packet.
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Viva
7 months ago
We should configure uRPF strict mode to forward the packet.
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Vernell
7 months ago
Option D makes the most sense.
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