JN0-106 Routing Fundamentals Practice Question
Exhibit
[edit]
user@router# run show route 10.10.20.0/24
inet.0: 5 destinations, 5 routes (4 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.10.20.0/24 [Static/5] 00:01:00
to 10.10.10.1 via ge-0/0/0.0
(No active path)
user@router# run show route 10.10.10.1
{master:0}
user@router#Refer to the exhibit. Why is the static route not active?
⚠ Common exam trap
Test-takers frequently assume a static route is always active once configured and committed, forgetting that JUNOS requires the next-hop to be reachable in the routing table for the route to be installed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The next-hop address is not reachable in the routing table.
For a static route to be active in the JUNOS routing table, the next-hop address must be reachable via an active route in the routing table. If the next-hop is not reachable, the static route is considered invalid and will not be installed as active, even if the outbound interface is up and the configuration is committed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The static route has a high preference.
Why it's wrong here
In Junos, route preference is a numeric value where lower numbers are more preferred. The static route has a preference of 5, which is extremely low and would normally be selected over dynamically learned routes for the same destination. However, preference alone does not make a route active; the next-hop must also be resolvable. Since the next-hop 10.10.10.1 is unreachable, the route remains inactive regardless of its low preference.
- ✗
The outbound interface is not up.
Why it's wrong here
The show route output explicitly lists ge-0/0/0.0 as the next-hop interface in the static route entry. If that interface were administratively down or not operational, the route would either be missing from the routing table entirely or shown with an unusable next-hop. The presence of the interface in the entry indicates that the interface is up from Junos' perspective. Therefore, the interface state is not the reason the route is not active; the real problem is the unresolved next-hop address.
- ✗
The static route is not committed.
Why it's wrong here
A static route that has not been committed would never appear in the routing table, because the routing table only contains committed configuration. The fact that the route and its attributes are visible in show route confirms that the configuration was committed and actively loaded into the routing engine. This option contradicts the evidence, so it cannot explain the route's inactive state. Committing is a prerequisite for the route to be considered at all, not a condition that makes it active.
- ✓
The next-hop address is not reachable in the routing table.
Why this is correct
For a static route with a next-hop IP address, Junos performs recursive route resolution: it looks up that next-hop address in the routing table to find a valid, active route to that address. The command 'show route 10.10.10.1' returns no output, proving there is no route in the table to the next-hop. Without a route to the next-hop, the static route cannot be installed as active, even though it is present in the routing table as an eligible route. This is exactly why the route is inactive.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 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 JN0-106 exam.