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JN0-102 · Question #416

Which two statements are correct about the inet.0 routing table? (Choose two.)

The correct answer is A. It stores information learned from routing protocols and other sources. C. It is used for populating the forwarding table. The inet.0 routing table in Junos OS stores routing information from various sources and is used to populate the forwarding table, which the router uses for packet forwarding decisions.

Routing Fundamentals

Question

Which two statements are correct about the inet.0 routing table? (Choose two.)

Options

  • AIt stores information learned from routing protocols and other sources.
  • BIt is used for populating the forwarding policy.
  • CIt is used for populating the forwarding table.
  • DIt is used for populating the Ethernet switching table.

How the community answered

(54 responses)
  • A
    93% (50)
  • B
    6% (3)
  • D
    2% (1)

Why each option

The `inet.0` routing table in Junos OS stores routing information from various sources and is used to populate the forwarding table, which the router uses for packet forwarding decisions.

AIt stores information learned from routing protocols and other sources.Correct

The `inet.0` routing table, also known as the unicast IPv4 routing table, is the primary repository for routes learned from routing protocols (like OSPF, BGP) and other sources such as static routes and directly connected interfaces.

BIt is used for populating the forwarding policy.

Forwarding policies can influence which routes are accepted into the `inet.0` table or how they are exported, but `inet.0` itself is not used for populating the forwarding policy.

CIt is used for populating the forwarding table.Correct

Routes in the `inet.0` routing table are evaluated and the best routes are then installed into the forwarding table (also known as the Packet Forwarding Engine-PFE table or FIB), which is used by the router's data plane to forward packets.

DIt is used for populating the Ethernet switching table.

The `inet.0` routing table is specifically for IP routing, not for populating the Ethernet switching table, which is maintained by the Ethernet switching process and contains MAC address to interface mappings.

Concept tested: Junos routing table basics (inet.0)

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

Topics

#routing tables#inet.0#forwarding table#routing protocols

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