- A
The static route preference is set too high
Why wrong: Preference affects route selection but does not cause a route to be hidden.
- B
The next-hop address 172.16.1.1 is unreachable
If the next-hop is unreachable, the route is hidden because the router cannot resolve it.
- C
The static route has not been committed
Why wrong: An uncommitted route would not appear in the routing table at all.
- D
The static route is a discard route
Why wrong: A discard route would show 'discard' in the routing table, not 'hidden'.
Question 441 of 514
JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An engineer configures a static route to 192.168.0.0/16 with next-hop 172.16.1.1. The router has a directly connected route for 172.16.1.0/30 via interface ge-0/0/0.1. However, the static route appears as 'hidden' in the routing table. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 172.16.1.1 is unreachable
In JUNOS, a static route with a next-hop that is not reachable (i.e., the next-hop address does not have a matching active route in the routing table) is automatically placed in a 'hidden' state. Although the router has a directly connected route for 172.16.1.0/30 via ge-0/0/0.1, if that interface is down or the next-hop address is misconfigured, the route will be inactive and the static route will be hidden. Therefore, the most likely cause is that the next-hop 172.16.1.1 is unreachable.
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 static route preference is set too high
Why it's wrong here
Preference affects route selection but does not cause a route to be hidden.
- ✓
The next-hop address 172.16.1.1 is unreachable
Why this is correct
If the next-hop is unreachable, the route is hidden because the router cannot resolve it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The static route has not been committed
Why it's wrong here
An uncommitted route would not appear in the routing table at all.
- ✗
The static route is a discard route
Why it's wrong here
A discard route would show 'discard' in the routing table, not 'hidden'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often see a directly connected route exists and assume the next-hop is reachable, but they overlook that the interface must be up/up. In JUNOS, 'hidden' specifically indicates a next-hop resolution failure, not a routing protocol decision.
Trap categories for this question
Command / output trap
A discard route would show 'discard' in the routing table, not 'hidden'.
Detailed technical explanation
How to think about this question
JUNOS uses a 'next-hop resolution' mechanism: a static route's next-hop must be resolved via an active route in the inet.0 table. If the next-hop is not reachable (e.g., the directly connected interface is down or the next-hop IP is not in any active prefix), the static route is flagged as 'hidden' and is not installed in the forwarding table. This behavior is controlled by the 'resolve' parameter (default for static routes) and can be verified with 'show route protocol static hidden'.
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.
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
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 address 172.16.1.1 is unreachable — In JUNOS, a static route with a next-hop that is not reachable (i.e., the next-hop address does not have a matching active route in the routing table) is automatically placed in a 'hidden' state. Although the router has a directly connected route for 172.16.1.0/30 via ge-0/0/0.1, if that interface is down or the next-hop address is misconfigured, the route will be inactive and the static route will be hidden. Therefore, the most likely cause is that the next-hop 172.16.1.1 is unreachable.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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