JN0-102 · Question #30
Which statement describes the PFE?
The correct answer is B. The PFE implements advanced services such as policing, stateless firewall filtering, and class of service. The Packet Forwarding Engine (PFE) is responsible for high-speed packet forwarding and implementing various advanced network services directly in hardware.
Question
Which statement describes the PFE?
Options
- AThe PFE controls the RE by providing Layer 2 and Layer 3 forwarding tables.
- BThe PFE implements advanced services such as policing, stateless firewall filtering, and class of service.
- CThe PFE sends traffic to the RE for systematic packet forwarding.
- DThe PFE receives hardware and environmental status messages from the RE.
How the community answered
(45 responses)- B93% (42)
- C2% (1)
- D4% (2)
Why each option
The Packet Forwarding Engine (PFE) is responsible for high-speed packet forwarding and implementing various advanced network services directly in hardware.
The Routing Engine (RE) controls the PFE by providing the forwarding tables (FIB-Forwarding Information Base) that the PFE uses for packet lookup, not the other way around.
The PFE is designed to perform advanced network services like policing, stateless firewall filtering, and Class of Service (CoS) at line rate. It leverages specialized hardware to process packets quickly and efficiently, offloading these tasks from the Routing Engine (RE).
The PFE is responsible for forwarding traffic directly, typically away from the RE, whereas the RE processes exceptions or control plane traffic.
The Routing Engine (RE) collects hardware and environmental status messages from various components, including the PFE, and is responsible for managing and displaying this information.
Concept tested: Junos PFE functions and responsibilities
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-overview/topics/concept/routing-engines-and-packet-forwarding-engines-overview.html
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