JN0-102 · Question #42
Which statement is correct regarding exception traffic processing?
The correct answer is B. Exception traffic is rate-limited across the internal link to protect the RE. Exception traffic, which is destined for the Routing Engine, is rate-limited across the internal link from the PFE to protect the RE from being overwhelmed.
Question
Which statement is correct regarding exception traffic processing?
Options
- AException traffic is only handled by the PFE.
- BException traffic is rate-limited across the internal link to protect the RE.
- CException traffic is not prioritized during times of congestion.
- DException traffic is forwarded based on forwarding table entries.
How the community answered
(30 responses)- A13% (4)
- B77% (23)
- C3% (1)
- D7% (2)
Why each option
Exception traffic, which is destined for the Routing Engine, is rate-limited across the internal link from the PFE to protect the RE from being overwhelmed.
Exception traffic is initially detected by the PFE but is then sent to the RE for processing, meaning it is not handled *only* by the PFE.
To protect the Routing Engine from denial-of-service attacks or overwhelming traffic, exception traffic is rate-limited as it is transferred from the PFE to the RE across the internal link.
Exception traffic, especially control plane protocols, is often prioritized to ensure network stability, even during congestion, although it is rate-limited.
Exception traffic is destined for the local router (RE) and is processed by the RE; it is not forwarded based on the general forwarding table entries used for transit traffic.
Concept tested: Exception traffic processing and RE protection
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-os-fundamentals/topics/topic-map/junos-os-fundamentals-architecture.html
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