Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 108

When does a Cisco router send an ICMP redirect?

Answer options

• A. when the packet's source and destination VRFs are different
• B. when the packet is source-routed
• C. when the packet's destination has load-balanced entries in the route table
• D. when the packet's ingress and egress interface are the same D

Correct answer:

Explanation

A Cisco router sends an ICMP redirect when the packet's ingress and egress interface are the same, indicating that there is a more efficient route available. The other options do not trigger ICMP redirects as they pertain to different routing scenarios that do not involve optimizing the current path taken by the packet.