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Question 570 - 300-410 discussion

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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?

A.

Configure uRPF loose mode to forward the packet.

Answers
A.

Configure uRPF loose mode to forward the packet.

B.

Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.

Answers
B.

Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.

C.

Permit the 172.16.3.251 in the inbound ACL on interface gi0/3 to allow 172.16.3.251.

Answers
C.

Permit the 172.16.3.251 in the inbound ACL on interface gi0/3 to allow 172.16.3.251.

D.

Configure uRPF strict mode to forward the packet

Answers
D.

Configure uRPF strict mode to forward the packet

Suggested answer: A

Explanation:

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.

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asked 07/10/2024
Wanicha Inburan
37 questions
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