JN0-102 · Question #236
Which two statements are true about the forwarding table? (Choose two.)
The correct answer is B. The forwarding table contains only active routes. C. The forwarding table is used to process transit packets.. The forwarding table is optimized for high-speed packet processing, containing only the best paths and residing in the data plane for efficient transit packet handling.
Question
Which two statements are true about the forwarding table? (Choose two.)
Options
- AThe forwarding table lists each source protocol and preference for each destination.
- BThe forwarding table contains only active routes.
- CThe forwarding table is used to process transit packets.
- DThe forwarding table is stored in compact flash.
How the community answered
(49 responses)- A4% (2)
- B90% (44)
- D6% (3)
Why each option
The forwarding table is optimized for high-speed packet processing, containing only the best paths and residing in the data plane for efficient transit packet handling.
The routing table (RIB) contains detailed information about source protocols and preferences, while the forwarding table (FIB) is a concise lookup table primarily for destination-to-next-hop mappings.
The forwarding table (FIB) contains only the best or 'active' routes that have been selected from the routing table (RIB). This streamlined set of routes ensures rapid lookup and forwarding decisions.
The forwarding table is located in the Packet Forwarding Engine (data plane) of a Junos device and is specifically used to make high-speed forwarding decisions for all transit packets, meaning packets that are passing through the device.
The forwarding table is stored in high-speed memory, such as TCAM or RAM, within the Packet Forwarding Engine for fast access, not on compact flash, which is for persistent storage.
Concept tested: Junos forwarding table characteristics
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-basics/topics/topic-map/routing-tables-forwarding-table-overview.html
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