JN0-102 · Question #152
Which statement is true about the forwarding plane?
The correct answer is D. The forwarding plane implements policers, stateless firewall filters, and class of service.. The forwarding plane is responsible for the high-speed processing of packets, including implementing features like policers, stateless firewall filters, and Class of Service (CoS). It applies these policies directly to the data traffic.
Question
Which statement is true about the forwarding plane?
Options
- AThe forwarding plane is the intelligence of the platform.
- BThe forwarding plane is based on an X86 architecture.
- CThe forwarding plane maintains the routing tables, bridging table, and primary forwarding table.
- DThe forwarding plane implements policers, stateless firewall filters, and class of service.
How the community answered
(37 responses)- A3% (1)
- B3% (1)
- C8% (3)
- D86% (32)
Why each option
The forwarding plane is responsible for the high-speed processing of packets, including implementing features like policers, stateless firewall filters, and Class of Service (CoS). It applies these policies directly to the data traffic.
The Routing Engine (RE) is considered the 'intelligence' of the platform as it makes routing decisions and builds the forwarding table, while the forwarding plane executes these decisions.
The forwarding plane typically relies on specialized ASICs (Application-Specific Integrated Circuits) for high-speed performance, not primarily a general-purpose X86 architecture, which is more common for the Routing Engine.
The Routing Engine (RE) maintains the primary routing tables and builds the forwarding table, then sends a copy of the forwarding table to the Packet Forwarding Engine (PFE) in the forwarding plane; the forwarding plane uses, but does not primarily maintain, these tables.
The forwarding plane, primarily the Packet Forwarding Engine (PFE), is designed to perform high-speed packet processing and apply policies directly to data traffic. This includes implementing features such as policers, stateless firewall filters, and Class of Service (CoS) to forward traffic efficiently according to defined rules.
Concept tested: Forwarding plane functions
Source: https://www.juniper.net/documentation/us/en/software/junos/junos-basics/topics/topic-map/junos-os-software-overview.html
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