Quick Answer
The answer is the command `show route table inet.0`. This is correct because `inet.0` is the default routing table for IPv4 unicast routes in Junos, containing all active routes learned from protocols like OSPF, BGP, and static routes, making it the standard way to view the IPv4 unicast routing information base (RIB). On the JNCIA-Junos exam, this tests your understanding of Junos routing table architecture, where `inet.0` is the primary table for IPv4 unicast; a common trap is confusing it with `inet6.0` for IPv6 or `inet.1` for multicast routes. To view the IPv4 routing table, always remember that `inet.0` is the default unicast table, and the `show route` command without a table argument also defaults to `inet.0`. A helpful memory tip: think of `inet.0` as the “zero” table for all your IPv4 unicast routes—zero confusion when you use it.
This JNCIA-JUNOS practice question tests your understanding of user interfaces. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A junior engineer is troubleshooting a routing issue and wants to see the route table for IPv4 unicast routes. Which command will display this information?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
show route table inet.0
Displays IPv4 unicast route table.
show route table inet6.0
Why wrong: Shows IPv6 routes.
show route forwarding-table
Why wrong: Shows forwarding table, not route table.
show route protocol bgp
Why wrong: Shows only BGP routes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
show route table inet.0
Option A is correct because the command 'show route table inet.0' displays the IPv4 unicast route table in Junos. The inet.0 table is the default routing table for IPv4 unicast routes, containing all active routes learned via various protocols (e.g., OSPF, BGP, static). This command is the standard way to view the IPv4 unicast routing information base (RIB) on Juniper devices.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
show route table inet.0
Why this is correct
Displays IPv4 unicast route table.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
show route table inet6.0
Why it's wrong here
Shows IPv6 routes.
show route forwarding-table
Why it's wrong here
Shows forwarding table, not route table.
show route protocol bgp
Why it's wrong here
Shows only BGP routes.
Common exam traps
The trap here is that candidates often confuse the routing table (RIB) with the forwarding table (FIB), or they may think 'show route protocol bgp' shows all routes, when it only shows routes from a specific protocol.
Trap categories for this question
Command / output trap
Shows IPv6 routes.
Detailed technical explanation
Junos separates the routing table (RIB) from the forwarding table (FIB). The inet.0 table is the primary RIB for IPv4 unicast routes, where routing protocols install their best routes. The forwarding table is derived from the RIB and is used by the Packet Forwarding Engine (PFE) for actual packet forwarding. Understanding this distinction is critical for troubleshooting routing issues, as a route may be present in inet.0 but not installed in the forwarding table if it is not the active route.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
The correct answer is: show route table inet.0 — Option A is correct because the command 'show route table inet.0' displays the IPv4 unicast route table in Junos. The inet.0 table is the default routing table for IPv4 unicast routes, containing all active routes learned via various protocols (e.g., OSPF, BGP, static). This command is the standard way to view the IPv4 unicast routing information base (RIB) on Juniper devices.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-JUNOS exam.
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