Huawei Certified Network Associate – Routing and Switching (HCNA-RS, legacy) — Question 68

Which of the following statements explains the behavior of the ICMP redirect function? (Choose two)

Answer options

• A. When a router receives data on the interface via which the same data needs to be forwarded, and the source is on the same segment as the next hop, an ICMP redirect message will be sent by the router to the source.
• B. When a router receives data on an interface, and the router's IP address matches the destination IP of the data, an ICMP redirect message will be sent by the router to the source.
• C. When a router receives data on the interface via which the same data needs to be forwarded, and the source is on the same segment as the next hop, an ICMP Redirect message will be sent by the source to the router.
• D. When a router receives data on the interface via which the same data needs to be forwarded, and the source is on a different segment from the next hop, an ICMP redirect message will be sent by the router to the source

Correct answer: A, D

Explanation

The correct answers, A and D, describe scenarios where an ICMP redirect message is sent when the router identifies that the source can reach the next hop more efficiently. Option B is incorrect because the router does not send an ICMP redirect when its IP matches the destination. Option C is wrong as it inaccurately states that the source sends the redirect message instead of the router.