JN0-102 · Question #37
In the Junos OS, what handles transit traffic?
The correct answer is B. Transit traffic is handled by the PFE only. In the Junos OS architecture, transit traffic is exclusively handled by the Packet Forwarding Engine (PFE).
Question
In the Junos OS, what handles transit traffic?
Options
- ATransit traffic is handled by the RE only.
- BTransit traffic is handled by the PFE only.
- CTransit traffic is handled by both the RE and the PFE.
- DTransit traffic is not handled by the RE or the PFE.
How the community answered
(62 responses)- A3% (2)
- B94% (58)
- C2% (1)
- D2% (1)
Why each option
In the Junos OS architecture, transit traffic is exclusively handled by the Packet Forwarding Engine (PFE).
The Routing Engine (RE) handles control plane functions and exception traffic, not the high-volume transit traffic that passes through the device.
The PFE is specifically designed to perform high-speed packet forwarding for transit traffic, utilizing the forwarding table built by the RE.
While the RE builds the forwarding table, it does not directly forward transit traffic; the PFE performs the actual forwarding.
Both the RE and PFE are crucial components of the Junos OS architecture, and they collectively handle all traffic, with the PFE specifically handling transit traffic.
Concept tested: PFE role in transit traffic forwarding
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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