JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
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?
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)
A
The route has a higher metric
Why wrong: The metric is 0, same as other static routes.
B
The route has a lower preference
Why wrong: The preference is 10, same as other routes; preference does not cause hidden state.
C
The route is not committed
Why wrong: The route appears in the routing table, so it is committed.
D
The next-hop is unreachable
Hidden static routes indicate that the next-hop is not reachable.
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
Option D is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 preference is 10, same as other routes; preference does not cause hidden state.
✗
The route is not committed
Why it's wrong here
The route appears in the routing table, so it is committed.
✓
The next-hop is unreachable
Why this is correct
Hidden static routes indicate that the next-hop is not reachable.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
In JUNOS, the routing table (route table) stores all routes, but only active routes are used for forwarding. A route becomes hidden when its next-hop is not reachable, which can be verified with the 'show route hidden' command. This behavior is governed by the JUNOS route resolution process, where the next-hop must be recursively resolvable to a directly connected interface; if the next-hop address is not reachable (e.g., due to a missing static route or down interface), the route is hidden. This is a key difference from Cisco IOS, where static routes with unreachable next-hops may still appear in the routing table but are not installed.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the JNCIA-JUNOS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Routing Fundamentals — This question tests Routing Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The next-hop is unreachable — Option D is correct because 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.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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