JN0-102 Question #27: Real Exam Question with Answer & Explanation

The correct answer is C. The forwarding table is stored on both the RE and PFE.. The forwarding table, also known as the FIB, is stored and utilized by both the Routing Engine and the Packet Forwarding Engine in a router.

Junos OS Fundamentals

Question

Which statement is correct about the forwarding table?

Options

AThe forwarding table is stored only on the PFE.
BThe forwarding table contains all known routes.
CThe forwarding table is stored on both the RE and PFE.
DThe forwarding table is stored only on the RE.

Explanation

The forwarding table, also known as the FIB, is stored and utilized by both the Routing Engine and the Packet Forwarding Engine in a router.

Common mistakes.

A. The forwarding table is not stored only on the PFE; the RE creates and maintains it before sending it to the PFE.
B. The forwarding table contains the best, most optimal routes for packet forwarding, derived from the routing table, rather than containing 'all known routes,' which is characteristic of the routing table itself.
D. The forwarding table is not stored only on the RE; it is crucial for the PFE to perform line-rate forwarding.

Concept tested. Router architecture - forwarding table location

Reference. https://www.juniper.net/documentation/us/en/software/junos/routing-overview/topics/topic-map-forwarding-tables.html

Topics

#forwarding table#Junos architecture#RE#PFE

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