JN0-102 · Question #239
Which statement is true about the routing table?
The correct answer is A. The routing table exists in the control plane only.. The routing table, which is responsible for building and storing all network paths, resides exclusively within the control plane of a Junos device.
Question
Which statement is true about the routing table?
Options
- AThe routing table exists in the control plane only.
- BThe routing table exists in the control plane and in the forwarding plane.
- CThe routing table contains both active and inactive routes.
- DThe routing table is stored on compact flash.
How the community answered
(28 responses)- A89% (25)
- B4% (1)
- C7% (2)
Why each option
The routing table, which is responsible for building and storing all network paths, resides exclusively within the control plane of a Junos device.
The routing table (Routing Information Base - RIB) is a logical database that resides solely within the Routing Engine, which is part of the control plane. Its function is to collect, process, and select the best routes without directly participating in packet forwarding.
The routing table exists only in the control plane; the forwarding table (FIB) is the one replicated to both control and forwarding planes.
While the routing table does contain both active and inactive routes, the statement that it exists solely in the control plane is a fundamental architectural truth about its location.
The routing table is stored in the Routing Engine's RAM for active processing, not on compact flash, which is used for persistent storage of system files and configuration.
Concept tested: Junos routing table location
Source: https://www.juniper.net/documentation/us/en/software/junos/routing-basics/topics/topic-map/routing-tables.html
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