JN0-106 Routing Fundamentals Practice Question
Exhibit
show route protocol static
inet.0: 8 destinations, 8 routes (7 active, 0 holddown, 1 hidden)
+ = Active Route, - = Last Active, * = Both
0.0.0.0/0 *[Static/10] 04:01:20, metric 0
> to 10.0.0.1 via ge-0/0/0.0
10.0.0.0/8 *[Static/10] 01:00:00, metric 0
> to 10.0.0.2 via ge-0/0/0.0
192.168.1.0/24 [Static/10] 02:00:00, metric 0
(hidden)Refer to the exhibit. Why is the route for 192.168.1.0/24 hidden?
⚠ Common exam trap
Many candidates confuse hidden routes with routes that are not committed or have a higher metric, but JUNOS specifically hides routes when the next-hop is unreachable, not due to metric or preference comparisons.
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 is unreachable
A route is hidden in the JUNOS routing table when its next-hop is unreachable. The show route command displays only active routes; if the next-hop address is not reachable via any active interface or route, the route is suppressed (hidden) and not used for forwarding. This is a fundamental behavior of JUNOS route selection and differs from Cisco IOS, which may still display such routes.
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 route has a higher metric
Why it's wrong here
The route's metric is 0, identical to other static routes for the same prefix. In Junos, a higher metric would affect route preference among equal-preference routes but would not hide a route; even a manually raised metric still leaves the route eligible for use if the next-hop is reachable. Since all static routes share the same metric, this assertion is incorrect.
- ✗
The route has a lower preference
Why it's wrong here
Preference determines which route is selected when multiple protocols offer the same prefix, with lower values being more preferred. All static routes have a default preference of 10, and a lower preference would actually make the route more attractive, not hidden. Hidden status is governed by next-hop reachability, not by preference, so this explanation is invalid.
- ✗
The route is not committed
Why it's wrong here
The route already appears in the output as a hidden route, which proves it exists in the routing table and was loaded from committed configuration. In Junos, any active route must have been committed; if the configuration were uncommitted, the route would not be present at all. Therefore claiming it is uncommitted contradicts the evidence shown.
- ✓
The next-hop is unreachable
Why this is correct
Junos marks static routes as hidden when the configured next-hop address cannot be resolved to an active outgoing interface or next-hop route. Because the destination 192.168.1.0/24 is unreachable through that next-hop, the routing protocol process retains the route but does not install it in the forwarding table, displaying it with the 'hidden' flag. This is the standard condition that creates hidden static routes.
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JA
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.