Question 1
IntermediateJunos OS Fundamentals ยท Exception traffic
A network architect is observing abnormally high CPU utilization on the Routing Engine (RE) of a core router, which is impacting management access and routing protocol stability. However, reports from network users indicate that data forwarding performance for transit traffic remains unaffected. Which category of traffic is the most likely cause of the high RE CPU, and what is the most appropriate initial command to investigate the issue?
Answer and explanation
Correct answer: C
The Routing Engine (RE) is responsible for handling exception traffic, which includes packets destined for the device itself, routing protocol updates, and management traffic. Transit traffic is processed by the Packet Forwarding Engine (PFE) and does not typically impact RE CPU. Since transit traffic is unaffected but the RE CPU is high, exception traffic is the cause. The show system processes extensive command is the best tool to identify which specific process on the RE is consuming the CPU resources.
